Filed Pursuant to Rule 424(b)(5)
                                                      Registration No. 333-68493

P R O S P E C T U S  S U P P L E M E N T

(TO PROSPECTUS DATED JULY 19, 2001)

                                5,000,000 SHARES

                            [SL GREEN REALTY CORP.]

                                  COMMON STOCK
                                   ---------

    We are offering and selling 5,000,000 shares of our common stock with this
prospectus supplement.

    Our common stock is listed on the New York Stock Exchange under the symbol
"SLG." The last reported sale price of our common stock on the New York Stock
Exchange on July 19, 2001, was $30.66 per share.

                                 --------------

    INVESTING IN OUR COMMON STOCK INVOLVES RISKS. SEE "RISK FACTORS" BEGINNING
ON PAGE 3 OF THE ACCOMPANYING PROSPECTUS.

    Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined if this
prospectus supplement or the accompanying prospectus is truthful or complete.
Any representation to the contrary is a criminal offense.

                                 --------------

    The underwriter will purchase our common stock at a price of $29.80 per
share resulting in $149,000,000 of aggregate net proceeds to the company before
deducting estimated expenses of this offering.

    The underwriter may offer the common stock in transactions on the New York
Stock Exchange, in the over-the-counter market or through negotiated
transactions at market prices or at negotiated prices. See "Underwriting."

    The underwriter expects to deliver the shares to purchasers on or about
July 25, 2001.

                                 --------------

                              SALOMON SMITH BARNEY

July 19, 2001

    YOU SHOULD RELY ONLY ON THE INFORMATION CONTAINED OR INCORPORATED BY
REFERENCE INTO THIS PROSPECTUS SUPPLEMENT AND THE ACCOMPANYING PROSPECTUS. WE
HAVE NOT, AND THE UNDERWRITER HAS NOT, AUTHORIZED ANYONE TO PROVIDE YOU WITH
DIFFERENT INFORMATION. IF ANYONE PROVIDES YOU WITH DIFFERENT OR ADDITIONAL
INFORMATION, YOU SHOULD NOT RELY ON IT. WE ARE NOT, AND THE UNDERWRITER IS NOT,
MAKING AN OFFER OF THESE SECURITIES IN ANY STATE WHERE THE OFFER IS NOT
PERMITTED. YOU SHOULD NOT ASSUME THAT THE INFORMATION CONTAINED IN THIS
PROSPECTUS SUPPLEMENT OR THE ACCOMPANYING PROSPECTUS AND THE DOCUMENTS
INCORPORATED BY REFERENCE IS ACCURATE AS OF ANY DATE OTHER THAN THEIR RESPECTIVE
DATES. OUR BUSINESS, FINANCIAL CONDITION, RESULTS OF OPERATIONS AND PROSPECTS
MAY HAVE CHANGED SINCE THOSE DATES.

                            ------------------------

                               TABLE OF CONTENTS



                                                                PAGE
                                                              --------
                                                           
                   PROSPECTUS SUPPLEMENT

Cautionary Statements Concerning Forward-Looking
  Information ..............................................      ii

SL Green Realty Corp. ......................................     S-1

Use of Proceeds ............................................     S-1

Underwriting ...............................................     S-1

Legal Matters ..............................................     S-3

                         PROSPECTUS

Information about SL Green .................................       3

Risk Factors ...............................................       3

Forward-Looking Statements May Prove Inaccurate ............      10

Use of Proceeds ............................................      11

Ratios of Earnings to Combined Fixed Charges and Preferred
  Stock Dividends ..........................................      11

Description of Common Stock ................................      12

Description of Preferred Stock .............................      13

Restrictions on Ownership of Capital Stock .................      19

Material Federal Income Tax Consequences ...................      21

Plan of Distribution .......................................      31

Legal Matters ..............................................      31

Experts ....................................................      31

Where You Can Find More Information ........................      32


                                       i

    WHEN USED IN THIS PROSPECTUS SUPPLEMENT, EXCEPT WHERE THE CONTEXT OTHERWISE
REQUIRES, THE TERMS "WE," "OUR," "US," "THE COMPANY," AND "SL GREEN" REFER TO SL
GREEN REALTY CORP. AND ITS SUBSIDIARIES, INCLUDING SL GREEN OPERATING
PARTNERSHIP, L.P.

                        CAUTIONARY STATEMENTS CONCERNING
                          FORWARD-LOOKING INFORMATION

    Certain information included or incorporated by reference in this prospectus
supplement or the accompanying prospectus contains forward-looking statements
within the meaning of Section 27A of the Securities Act of 1933, as amended, and
Section 21E of the Securities Exchange Act of 1934, as amended, and, as such,
involves known and unknown risks, uncertainties and other factors which may
cause our actual results, performance or achievements to be materially different
from future results, performance or achievements expressed or implied by these
forward-looking statements. Forward-looking statements, which are based on
certain assumptions and describe our future plans, strategies and expectations,
are generally identifiable by use of the words "may," "will," "should,"
"expect," "anticipate," "estimate," "believe," "intend," "project," or the
negative of these words, or other similar words or terms. Factors which could
materially and adversely affect us include, but are not limited to, changes in
economic conditions generally and the real estate market specifically,
legislative/regulatory changes (including changes to laws governing the taxation
of REITs), availability of capital (debt and equity), interest rate
fluctuations, competition, supply and demand for properties in our current and
proposed market areas, accounting principles, policies and guidelines applicable
to REITs, environmental risks, tenant bankruptcies and the other matters
described under the heading "Risk Factors" beginning on page 3 of the
accompanying prospectus. All of these factors should be considered in evaluating
any forward-looking statements included or incorporated by reference in this
prospectus supplement or the accompanying prospectus.

    We undertake no obligation to publicly update or revise any forward-looking
statements included or incorporated by reference in this prospectus supplement
or the accompanying prospectus, whether as a result of new information, future
events or otherwise. In light of the factors referred to above, the
forward-looking events discussed in or incorporated by reference in this
prospectus supplement or the accompanying prospectus may not occur and actual
results, performance or achievement could differ materially from that
anticipated or implied in the forward-looking statements.

                                       ii

                             SL GREEN REALTY CORP.

    SL Green is a self-managed real estate investment trust, which we refer to
as a REIT, with in-house capabilities in property management, development,
construction and acquisitions. We are the first such REIT to own, manage, lease,
acquire and reposition office properties primarily in Manhattan. We own all of
our assets and conduct substantially all of our business through our operating
partnership, SL Green Operating Partnership, L.P. We are the managing general
partner of the operating partnership and, as of March 31, 2001, we owned 91.5%
of the outstanding partnership interests in the operating partnership.

    Our office properties are generally more than 25 years old but are in good
physical condition, enjoy widespread acceptance by high-quality tenants and are
situated in desirable locations in Manhattan. Our office properties can be
distinguished from Class A properties in that Class A properties are generally
newer properties with higher finishes and obtain the highest rental rates within
their markets.

    As of March 31, 2001, our wholly owned portfolio consisted of 20 commercial
properties encompassing approximately 7.8 million rentable square feet located
primarily in midtown Manhattan ("Manhattan"), a borough of New York City (the
"Properties") and one triple-net leased property located in Shelton,
Connecticut. As of March 31, 2001, the weighted average occupancy (total
occupied square feet divided by total available square feet) of the Properties
was 99.0%. Our portfolio also includes ownership interests in unconsolidated
joint ventures, which own five commercial properties in Manhattan, encompassing
approximately 2.2 million rentable square feet (97.0% occupied as of March 31,
2001). In addition, we continue to manage four office properties owned by
third-parties and affiliated companies encompassing approximately 1.0 million
rentable square feet.

    Our management team has developed a comprehensive knowledge of the Manhattan
office market, an extensive network of tenant and other business relationships
and experience in acquiring underperforming office properties and repositioning
them into profitable properties through intensive full-service management and
leasing efforts.

    We were incorporated in the State of Maryland on June 10, 1997. Our
executive offices are located at 420 Lexington Avenue, New York, New York 10170
and our telephone number is (212) 594-2700.

                                USE OF PROCEEDS

    The net proceeds to us from the sale of the shares of common stock offered
hereby, after deducting estimated expenses related to this offering of $600,000,
are approximately $148,400,000. We will use the net proceeds from this offering
to repay indebtedness under our secured credit facility and unsecured credit
facility and for our working capital needs. As of March 31, 2001, our secured
credit facility, which is scheduled to mature on December 22, 2001, had an
aggregate of $44.9 million outstanding bearing an interest rate of 7.0%, and our
unsecured credit facility, which is scheduled to mature on June 27, 2003, had an
aggregate of $167.0 million outstanding bearing an interest rate of 7.19%.
Salomon Smith Barney Inc. acts as syndication agent of our unsecured credit
facility. Citicorp Real Estate, Inc., an affiliate of the underwriter, is one of
the lenders under our unsecured credit facility.

                                  UNDERWRITING

    Subject to the terms and conditions stated in the underwriting agreement
dated as of the date of this prospectus supplement, Salomon Smith Barney Inc.,
as the underwriter, has agreed to purchase, and we have agreed to sell to the
underwriter, 5,000,000 shares of our common stock.

                                      S-1

    The underwriting agreement provides that the obligation of the underwriter
to purchase the shares in this offering is subject to approval of legal matters
by counsel and other conditions. The underwriter is obligated to purchase all
the shares if it purchases any of the shares.

    Salomon Smith Barney Inc. proposes to offer the shares of common stock from
time to time for sale in one or more transactions on the New York Stock
Exchange, in the over-the-counter market, through negotiated transactions or
otherwise at market prices prevailing at the time of the sale, at prices related
to prevailing market prices or at negotiated prices, subject to receipt and
acceptance by it and subject to its right to reject any order in whole or in
part. In connection with the sale of the shares of common stock offered hereby,
Salomon Smith Barney Inc. may be deemed to have received compensation in the
form of underwriting discounts. Salomon Smith Barney Inc. may effect such
transactions by selling shares of the common stock to or through dealers, and
such dealers may receive compensation in the form of discounts, concessions or
commissions from Salomon Smith Barney Inc. and/or purchasers of shares of common
stock for whom they may act as agents or to whom they may sell as principal.

    Our common stock is listed on the New York Stock Exchange under the symbol
"SLG."

    We and certain of our executive officers and directors have agreed not to do
any of the following, whether any transaction described in clause (1), (2) or
(3) below is to be settled by delivery of our common stock or other securities,
in cash or otherwise, in each case without the prior written consent of Salomon
Smith Barney Inc. for a period of 30 days after the date of this prospectus
supplement:

    (1) offer, sell, contract to sell, pledge, or otherwise dispose of, or enter
       into any transaction or device which is designed or could be expected to,
       result in the disposition by any person at any time in the future of any
       shares of our common stock or securities convertible into or exchangeable
       for our common stock or substantially similar securities, other than any
       of the following:

       - the shares of our common stock to be sold under this prospectus
         supplement;

       - shares of common stock we issue pursuant to acquisition or joint
         venture arrangements; and

       - shares of our common stock we issue pursuant to employee benefit plans,
         qualified stock option plans or other employee compensation plans
         existing on the date of this prospectus supplement or pursuant to
         currently outstanding options, warrants or rights.

    (2) sell or grant options, rights or warrants with respect to any shares of
       our common stock or securities convertible into or exchangeable for our
       common stock or substantially similar securities, other than the grant of
       options pursuant to option plans existing on the date hereof; and

    (3) enter into any swap or other derivatives transaction that transfers to
       another, in whole or in part, any of the economic benefits or risks of
       ownership of shares of our common stock.

    In connection with the offering, the underwriter may purchase and sell
shares of common stock in the open market. These transactions may include short
sales, covering transactions and stabilizing transactions. Short sales involve
sales of common stock in excess of the number of shares to be purchased by the
underwriter in the offering, which creates a short position. The underwriter
must close out any short position by purchasing shares of common stock in the
open market. A short position is more likely to be created if the underwriter is
concerned that there may be downward pressure on the price of the shares in the
open market after pricing that could adversely affect investors who purchase in
the offering. Stabilizing transactions consist of bids for or purchases of
shares in the open market while the offering is in progress.

                                      S-2

    Any of these activities may have the effect of preventing or retarding a
decline in the market price of the common stock. They may also cause the price
of the common stock to be higher than the price that would otherwise exist in
the open market in the absence of these transactions. The underwriter may
conduct these transactions on the New York Stock Exchange or in the
over-the-counter market, or otherwise. If the underwriter commences any of these
transactions, it may discontinue them at any time.

    We estimate that the total expenses of this offering will be $600,000.

    We have agreed to indemnify the underwriter against certain liabilities,
including liabilities under the Securities Act of 1933, as amended, or to
contribute to payments the underwriter may be required to make because of any of
those liabilities.

    The underwriter and its affiliates have engaged in, and may in the future
engage in, investment banking and other commercial dealings in the ordinary
course of business with us. For example, the underwriter acts as syndication
agent of our unsecured credit facility. Citicorp Real Estate, Inc., an affiliate
of the underwriter, is one of the lenders under our unsecured credit facility.
They have received customary fees and commissions for their past transactions.

                                 LEGAL MATTERS

    The legality of the shares of common stock offered hereby and certain legal
matters described under "Material Federal Income Tax Consequences" in the
accompanying prospectus will be passed upon for us by Sidley Austin Brown & Wood
LLP, New York, New York. In addition, certain legal matters will be passed upon
for the underwriter by Clifford Chance Rogers & Wells LLP, New York, New York.

                                      S-3

PROSPECTUS

                                  $400,000,000

                            [SL GREEN REALTY CORP.]

                        COMMON STOCK AND PREFERRED STOCK

    We may offer our common stock and preferred stock, which may be convertible
into common stock, with an aggregate initial offering price of $400,000,000 on
terms to be determined at the time of offering. We may issue the securities
separately or together in one or more series, in amounts, at prices and on terms
described in one or more prospectus supplements. It is important that you read
both this prospectus and the prospectus supplement before you invest.

    We may offer the securities directly, through agents, or to or through
underwriters. The prospectus supplement will describe the terms of the plan of
distribution and set forth the names of any underwriters involved in the sale of
the securities. See "Plan of Distribution" on page 31 for more information on
this topic. No securities may be sold without delivery of a prospectus
supplement describing the method and terms of the offering of those securities.

    SEE "RISK FACTORS" BEGINNING ON PAGE 3 OF THIS PROSPECTUS FOR A DESCRIPTION
OF RISK FACTORS THAT SHOULD BE CONSIDERED BY PURCHASERS OF THE SECURITIES.

    Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or passed upon the
adequacy of this prospectus. Any representation to the contrary is a criminal
offense.

JULY 19, 2001

                               TABLE OF CONTENTS


                                                           
Information About SL Green..................................      3

Risk Factors................................................      3

Forward-Looking Statements May Prove Inaccurate.............     10

Use of Proceeds.............................................     11

Ratios of Earnings to Combined Fixed Charges and Preferred
  Stock Dividends...........................................     11

Description of Common Stock.................................     12

Description of Preferred Stock..............................     13

Restrictions on Ownership of Capital Stock..................     19

Material Federal Income Tax Consequences....................     21

Plan of Distribution........................................     31

Legal Matters...............................................     31

Experts.....................................................     31

Where You Can Find More Information.........................     32


                                       2

                           INFORMATION ABOUT SL GREEN

    SL Green is a self-managed real estate investment trust, which we refer to
as a REIT, with in-house capabilities in property management, development,
construction and acquisitions. We are the first such REIT to own, manage, lease,
acquire and reposition only office properties in Manhattan. We own all of our
assets and conduct substantially all of our business through our operating
partnership, SL Green Operating Partnership, L.P. We are the managing general
partner of the operating partnership and as of March 31, 2001, we owned 91.5% of
the outstanding partnership interests in the operating partnership.

    Our office properties generally are more than 25 years old but are in good
physical condition, enjoy widespread acceptance by high-quality tenants and are
situated in desirable locations in Manhattan. Our office properties can be
distinguished from Class A properties in that Class A properties are generally
newer properties with higher finishes and obtain the highest rental rates within
their markets.

    Our management team has developed a comprehensive knowledge of the Manhattan
office market, an extensive network of tenant and other business relationships
and experience in acquiring underperforming office properties and repositioning
them into profitable properties through intensive full-service management and
leasing efforts.

    We were incorporated in the State of Maryland on June 10, 1997. Our
executive offices are located at 420 Lexington Avenue, New York, New York 10170
and our telephone number is (212) 594-2700.

                                  RISK FACTORS

    Set forth below are risks that we believe are material to investors who
purchase or own common stock or preferred stock. We refer to the common stock
and the preferred stock together as "securities."

- FUTURE DECLINES IN THE DEMAND FOR OFFICE SPACE IN MIDTOWN MANHATTAN COULD
  ADVERSELY AFFECT OUR RESULTS OF OPERATIONS AND, CONSEQUENTLY, OUR ABILITY TO
  MAKE DISTRIBUTIONS TO SHAREHOLDERS.

    Most of our office properties are located in midtown Manhattan. As a result,
our business is largely dependent on the condition of the New York City economy
in general and the market for office space in midtown Manhattan, in particular.
The New York City economy may not continue to grow. The market for office space
in midtown Manhattan has experienced downturns, most recently in the late 1980's
and the early 1990's. A similar downturn could result in a reduction of our
revenue and thus adversely affect our ability to make distributions to
shareholders.

    WE MAY BE UNABLE TO RENEW LEASES OR RELET SPACE AS LEASES EXPIRE.  When our
tenants decide not to renew their leases upon their expiration, we may not be
able to relet the space. Even if tenants do renew or we can relet the space, the
terms of renewal or reletting, including the cost of required renovations, may
be less favorable than current lease terms. Over the next five years, through
the end of 2005, leases will expire on approximately 37.1% and 36.1% of the
rentable square feet at our wholly owned and joint venture properties,
respectively. As of March 31, 2001, approximately 2.9 million and 0.8 million
square feet are scheduled to expire by December 31, 2005 and these leases
currently have annualized escalated rental income totaling $84.6 million and
$20.6 million, respectively. If we are unable to promptly renew the leases or
relet this space at similar rates, our cash flow and ability to service debt and
make distributions to shareholders would be adversely affected.

    THE EXPIRATION OF LONG TERM LEASES OR OPERATING SUBLEASE INTERESTS COULD
ADVERSELY AFFECT OUR RESULTS OF OPERATIONS. Our interest in four of our
properties is through either long-term leasehold or operating sublease interests
in the land and the improvements, rather than by a fee interest in the land.
Unless we can purchase a fee interest in the underlying land or extend the terms
of these leases before their

                                       3

expiration, we will lose our right to operate these properties and our interest
in the improvements upon expiration of the leases. These properties are 673
First Avenue, 420 Lexington Avenue, 711 Third Avenue and 1140 Avenue of the
Americas. The average term of these long term leases, including our unilateral
extension rights on two of the properties, is 48 years. Pursuant to the
operating sublease arrangements, we, as tenant under the operating sublease,
perform the functions traditionally performed by landlords with respect to our
subtenants. We are responsible for not only collecting rent from our subtenants,
but also maintaining the property and paying expenses relating to the property.
The annualized escalated rents of these properties at March 31, 2001 totaled
$74.4 million or 34.4% of SL Green's total annualized revenue associated with
wholly owned properties.

    RELIANCE ON MAJOR TENANTS COULD ADVERSELY AFFECT OUR RESULTS OF
OPERATIONS.  Giving effect to signed leases in effect as of March 31, 2001 for
wholly owned properties as of that date, the five largest tenants, based on
annualized rent, accounted for approximately 10.2% of our total annualized
rental revenues and no one tenant accounted for more than 2.5% of that total.
Our business would be adversely affected if any of these tenants became
insolvent, declared bankruptcy or otherwise refused to pay rent in a timely
fashion or at all.

- OUR DEPENDENCE ON SMALLER AND GROWTH-ORIENTED BUSINESSES TO RENT OUR OFFICE
  SPACE COULD ADVERSELY AFFECT OUR CASH FLOW.

    Many of the tenants in our properties are smaller, growth-oriented
businesses that may not have the financial strength of larger corporate tenants.
Smaller companies generally experience a higher rate of failure than large
businesses. Growth-oriented firms may seek other office space, including Class A
space, as they develop. Dependence on these companies could create a higher risk
of tenant defaults, turnover and bankruptcies, which could adversely affect our
distributable cash flow.

- DEBT FINANCING, FINANCIAL COVENANTS, DEGREE OF LEVERAGE, AND INCREASES IN
  INTEREST RATES COULD ADVERSELY AFFECT OUR ECONOMIC PERFORMANCE.

    SCHEDULED DEBT PAYMENTS COULD ADVERSELY AFFECT OUR RESULTS OF
OPERATIONS.  The total principal amount of our outstanding consolidated
indebtedness was $740.5 million as of March 31, 2001, $44.9 million of which was
borrowings under our secured credit facility, $167.0 million under our unsecured
credit facility and $528.5 million of which was non-recourse mortgage loans on
11 of our properties. Cash flow could be insufficient to pay distributions at
expected levels and meet the payments of principal and interest required under
our current mortgage indebtedness and our credit facilities. Our secured credit
facility matures on December 22, 2001. Our unsecured credit facility matures on
June 27, 2003. The total principal amount of indebtedness outstanding at the
joint venture properties was $274.6 million, of which our proportionate share
was $128.4 million.

    If we are unable to make payments under our secured or unsecured credit
facilities, all amounts due and owing at such time shall accrue interest at a
rate equal to 5% and 4%, respectively, higher than the rate at which each such
loan was made. If a property is mortgaged to secure payment of indebtedness and
we are unable to meet mortgage payments, the mortgagee could foreclose on the
property, resulting in loss of income and asset value. Foreclosure on mortgaged
properties or an inability to make scheduled payments under the credit facility
would likely have a negative impact on our financial condition and results of
operations.

    We may not be able to refinance existing indebtedness, which in virtually
all cases requires substantial principal payments at maturity. In December 2003,
$11.3 million of debt on one of our wholly owned buildings will have matured and
in 2004, $229.1 million of debt on three of our wholly owned buildings will have
matured. In 2002, $64.6 million and in 2003, $58.0 million of debt on three of
our joint venture properties will have matured. At the present time we intend to
refinance the debt associated with these properties on or prior to their
respective maturity dates. If any principal payments due at maturity cannot be
refinanced, extended or paid with proceeds of other capital transactions,

                                       4

such as new equity capital, our cash flow will not be sufficient in all years to
repay all maturing debt. At the time of refinancing, prevailing interest rates
or other factors such as the possible reluctance of lenders to make commercial
real estate loans, may result in higher interest rates. Increased interest
expense on the refinanced debt would adversely affect cash flow and our ability
to service debt and make distributions to shareholders.

    FINANCIAL COVENANTS COULD ADVERSELY AFFECT OUR ABILITY TO CONDUCT OUR
BUSINESS.  The mortgages on our properties contain negative covenants which
limit our ability to further mortgage the property, to enter into new leases or
materially modify existing leases, and to discontinue insurance coverage. In
addition, our secured and unsecured credit facilities contain restrictions and
requirements on our method of operations. Our secured and unsecured credit
facilities also have requirements that designate total debt to assets ratios,
debt service coverage ratios and minimum ratios of unencumbered assets to
unsecured debt are maintained. Restrictions on our ability to conduct business
could adversely affect our results of operations and our ability to make
distributions to shareholders.

    RISING INTEREST RATES COULD ADVERSELY AFFECT OUR CASH FLOW.  Advances under
our secured and unsecured credit facilities and certain property-level mortgage
debt will bear interest at a variable rate. These variable rate borrowings
totaled $361.9 million at March 31, 2001. Borrowings under our unsecured credit
facility bear interest at a spread equal to the London Interbank Offered Rate
("LIBOR") plus from 137.5 basis points to 175 basis points, depending on our
leverage ratio. Borrowings under our secured credit facility bear interest at a
spread equal to the LIBOR plus 125 basis points. As of March 31, 2001 borrowings
under the secured and unsecured facilities totaled $44.9 and $167.0 million and
bore interest at 7.00% and 7.19%, respectively. Additionally, certain advances
under property level mortgage debt ($150.0 million) bear interest at a variable
rate. We may incur indebtedness in the future that also bears interest at a
variable rate or may be required to refinance our debt at higher rates.
Accordingly, increases in interest rates above that which we anticipated based
upon historical trends could adversely affect our ability to continue to make
distributions to shareholders. At March 31, 2001, a hypothetical 100 basis point
adverse move (increase) in interest rates along the entire interest rate curve
would adversely effect our interest costs by approximately $4.0 million
annually.

    OUR POLICY OF NO LIMITATION ON DEBT COULD ADVERSELY AFFECT OUR CASH
FLOW.  Our organizational documents do not contain any limitation on the amount
of indebtedness we may incur. As of March 31, 2001, assuming the conversion of
all outstanding units of the operating partnership into shares of our common
stock, our debt to market capitalization ratio, excluding our share of joint
venture debt of $128.4 million, was approximately 46.0%. However, our policy is
to incur debt only if upon this incurrence our debt to market capitalization
ratio would be 55.0% or less. Our board of directors can alter or eliminate this
policy and would do so if our board of directors determines that this action is
in the best interests of our business. If this policy is changed and we become
more highly leveraged, an increase in debt service that could adversely affect
cash available for distribution to shareholders and could increase the risk of
default on our indebtedness. In addition, any change that increases our debt to
market capitalization percentage could be viewed negatively by investors. As a
result, our share price could decrease.

    We have established our debt policy relative to the total market
capitalization of our business rather than relative to the book value of our
assets. We use total market capitalization because we believe that the book
value of our assets, which to a large extent is the depreciated original cost of
our properties, and our primary tangible assets, does not accurately reflect our
ability to borrow and to meet debt service requirements. Our market
capitalization, however, is more variable than book value, and does not
necessarily reflect the fair market value of our assets at all times. We also
will consider factors other than market capitalization in making decisions
regarding the incurrence of indebtedness, such as the purchase price of
properties to be acquired with debt financing, the estimated market value

                                       5

of our properties upon refinancing and the ability of particular properties and
our business as a whole to generate cash flow to cover expected debt service.

    INVESTMENTS IN MORTGAGE LOANS COULD CAUSE EXPENSES WHICH COULD ADVERSELY
AFFECT OUR RESULTS OF OPERATIONS.  We own mortgage interests in three properties
with an aggregate book value of $93.0 million at March 31, 2001. To the extent
we invest in mortgage loans and preferred equity, such investments may or may
not be recourse obligations of the borrower and generally will not be insured or
guaranteed by governmental agencies or otherwise. In the event of a default
under these obligations, we may have to foreclose our mortgages or protect our
investments by acquiring title to a property and thereafter making substantial
improvements or repairs in order to maximize the property's investment
potential. Borrowers may contest enforcement of foreclosure or other remedies,
seek bankruptcy protection against such enforcement and/or bring claims for
lender liability in response to actions to enforce mortgage obligations.
Relatively high loan-to-value ratios and declines in the value of the property
may prevent us from realizing an amount equal to its mortgage loan upon
foreclosure.

    JOINT INVESTMENTS COULD BE ADVERSELY AFFECTED BY OUR LACK OF SOLE
DECISION-MAKING AUTHORITY AND RELIANCE UPON A CO-VENTURER'S FINANCIAL
CONDITION.  We co-invest with third parties through partnerships, joint
ventures, co-tenancies or other entities, acquiring non-controlling interests
in, or sharing responsibility for managing the affairs of, a property,
partnership, joint venture, co-tenancy or other entity. Therefore, we will not
be in a position to exercise sole decision-making authority regarding that
property, partnership, joint venture or other entity. Investments in
partnerships, joint ventures, or other entities may involve risks not present
were a third party not involved, including the possibility that our partners,
co-tenants or co-venturers might become bankrupt or otherwise fail to fund their
share of required capital contributions. Additionally, our partners or
co-venturers might at any time have economic or other business interests or
goals which are inconsistent with our business interests or goals. These
investments may also have the potential risk of impasses on decisions such as a
sale, because neither we nor the partner, co-tenant or co-venturer would have
full control over the partnership or joint venture. Consequently, actions by
such partner, co-tenant or co-venturer might result in subjecting properties
owned by the partnership or joint venture to additional risk. In addition, we
may in specific circumstances be liable for the actions of our third-party
partners, co-tenants or co-venturers. As of March 31, 2001, SL Green was
participating in five unconsolidated joint ventures encompassing five properties
and had an aggregate cost basis in the joint ventures totaling $72.7 million.

    WE ARE SUBJECT TO POSSIBLE ENVIRONMENTAL LIABILITIES AND OTHER POSSIBLE
LIABILITIES.  We are subject to various federal, state and local environmental
laws. These laws can impose liability on property owners or operators for the
costs of removal or remediation of certain hazardous substances released on a
property, even if the property owner was not responsible for the release of the
hazardous substances. The presence of hazardous substances on our properties may
adversely affect occupancy and our ability to sell or borrow against those
properties. In addition to those costs of government claims under environmental
laws, private plaintiffs may bring claims for personal injury or similar
reasons. Various laws also impose liability for the costs of removal or
remediation of hazardous substances at the disposal or treatment facility.
Anyone who arranges for the disposal or treatment of hazardous substances at
such a facility is potentially liable under such laws. These laws often impose
liability whether or not the facility is or ever was owned or operated by such
person.

    Our properties may be subject to other risks relating to current or future
laws including laws benefiting disabled persons, and other state or local
zoning, construction or other regulations. These laws may require significant
property modifications in the future for which we may not have budgeted and
could result in fines being levied against us. In addition, although we believe
that we adequately insure our properties, we are subject to the risk that our
insurance may not cover all of the costs to restore a property which is damaged
by a fire or other similar catastrophic event. The occurrence of

                                       6

any of these events could have an adverse impact on our cash flows and ability
to make distributions to shareholders.

- OUR SHAREHOLDERS' ABILITY TO EFFECT CHANGES IN CONTROL OF SL GREEN IS LIMITED.

    PROVISIONS OF OUR ARTICLES OF INCORPORATION AND BYLAWS COULD INHIBIT CHANGES
IN CONTROL.  A change of control of SL Green could benefit shareholders by
providing them with a premium over the then-prevailing market price of the
stock. However provisions contained in our articles of incorporation and bylaws
may delay or prevent a change in control of SL Green. These provisions,
discussed more fully below, are:

    - staggered board of directors;

    - ownership limitations for tax purposes;

    - the board of directors ability to issue additional common stock and
      preferred stock without shareholder approval; and

    - shareholder rights plan.

    -  OUR BOARD OF DIRECTORS IS STAGGERED INTO THREE SEPARATE CLASSES.  The
board of directors of SL Green is divided into three classes. The terms of the
class I, class II and class III directors expire in 2004, 2002 and 2003,
respectively. Our classified board may deter changes in control because of the
increased time period necessary for a third party to acquire control of the
board.

    -  WE HAVE A SHARE OWNERSHIP LIMIT FOR REIT TAX PURPOSES.  To remain
qualified as a REIT for federal income tax purposes, not more than 50% in value
of our outstanding capital stock may be owned by five or fewer individuals at
any time during the last half of any year. For this purpose, stock may be
"owned" directly, as well as indirectly under certain constructive ownership
rules, including, for example, rules that attribute stock held by one family
member to another family member. To avoid violating this rule regarding share
ownership limitations and maintain our REIT qualification, our articles of
incorporation prohibit ownership by any single shareholder of more than 9.0% in
value or number of shares of any class or series of our stock.

    The board of directors has the discretion to raise or waive this limitation
on ownership for any shareholder if deemed to be in our best interest. To obtain
a waiver, a shareholder must present the board and our tax counsel with evidence
that ownership in excess of this limit will not affect our present or future
REIT status.

    Absent any exemption or waiver, stock acquired or held in excess of the
limit on ownership will be transferred to a trust for the exclusive benefit of a
designated charitable beneficiary, and the shareholder's rights to distributions
and to vote would terminate. The shareholder would be entitled to receive, from
the proceeds of any subsequent sale of the shares transferred to the charitable
trust, the lesser of: the price paid for the stock or, if the owner did not pay
for the stock, the market price of the stock on the date of the event causing
the stock to be transferred to the charitable trust; and the amount realized
from the sale.

THIS LIMITATION ON OWNERSHIP OF STOCK COULD DELAY OR PREVENT A CHANGE IN
  CONTROL.

    -  FUTURE ISSUANCES OF COMMON STOCK AND PREFERRED STOCK COULD DILUTE
EXISTING SHAREHOLDERS' INTERESTS. Our articles of incorporation authorize our
board of directors to issue additional shares of common stock and preferred
stock without shareholder approval. This issuance could dilute our existing
shareholders' interests. Also, any future series of preferred stock may have
voting provisions that could delay or prevent a change of control.

                                       7

- WE HAVE A SHAREHOLDER RIGHTS PLAN.

    We adopted a shareholder rights plan which provides, among other things,
that when specified events occur, our shareholders will be entitled to purchase
from us a newly created series of junior preferred shares, subject to our
ownership limit described below. The preferred share purchase rights are
triggered by the earlier to occur of (1) ten days after the date of a public
announcement that a person or group acting in concert has acquired, or obtained
the right to acquire, beneficial ownership of 17% or more of our outstanding
shares of common stock or (2) ten business days after the commencement of or
announcement of an intention to make a tender offer or exchange offer, the
consummation of which would result in the acquiring person becoming the
beneficial owner of 17% or more of our outstanding common stock. The preferred
share purchase rights would cause substantial dilution to a person or group that
attempts to acquire us on terms not approved by our board of directors.

- THERE ARE POTENTIAL CONFLICTS OF INTEREST BETWEEN US AND MESSRS. GREEN AND
  FELDMAN.

    There is a potential conflict of interest relating to the disposition of the
property contributed to us by Stephen L. Green, and his family and Benjamin P.
Feldman. Both Mr. Green and Mr. Feldman serve as members of the board of
directors and Mr. Green is the Chief Executive Officer. As part of our
formation, these individuals contributed appreciated property, with a net book
value of $73.4 million, to the operating partnership in exchange for units of
interest in the operating partnership. They did not recognize any taxable gain
as a result of the contribution. The operating partnership, however, took a tax
basis in the contributed property equal to that of the contributing unitholder.
The fair market value of the property contributed by these individuals exceeded
its tax basis by approximately $34.0 million at the time of contribution. The
difference between fair market value and tax basis at the time of contribution
represents a built-in gain. If we sell a property in a transaction in which a
taxable gain is recognized, for tax purposes the built-in gain would be
allocated solely to those individuals but not to us. As a result, Messrs. Green
and Feldman have a conflict of interest if the sale of a property which they
contributed is in our best interest but not theirs.

    There is a potential conflict of interest relating to the refinancing of
indebtedness allocated to Messrs. Green and Feldman. These individuals would
recognize gain if they were to receive a distribution of cash from the operating
partnership in an amount that exceeds their tax basis in their respective
partnership units. Their tax basis includes their share of debt, including
mortgage indebtedness, owed by the operating partnership. If the operating
partnership were to retire such debt, then these individuals would experience a
decrease in their share of liabilities which, for tax purposes, would be treated
as a distribution of cash to them. To the extent the deemed distribution of cash
exceeded their tax basis, they would recognize gain.

- LIMITATIONS ON ABILITY TO SELL OR REDUCE THE INDEBTEDNESS ON SPECIFIC
  MORTGAGED PROPERTIES COULD ADVERSELY AFFECT THE VALUE OF THE STOCK.

    We have agreed to restrictions relating to future transactions involving 673
First Avenue and 470 Park Avenue South. During the period of time that these
restrictions apply, our ability to manage or use these properties in a manner
that is in our overall best interests may be impaired. In particular, these
restrictions could preclude us from participating in major transactions
otherwise favorable to us if a disposition of these restricted assets is
required. These restrictions may also inhibit a change in control of SL Green
even though a disposition or change in control might be in the best interests of
the shareholders.

    Specifically, we have agreed not to sell our interest in these properties
until August 20, 2009 without the approval of unitholders holding at least 75%
of the units issued in consideration for these properties. The current carrying
value of the commercial real estate totaled $81.9 million at March 31, 2001. We
have also agreed not to reduce the mortgage indebtedness ($20.9 million at March
31, 2001),

                                       8

other than pursuant to scheduled amortization, on either property until one year
prior to their respective maturity dates without the same consent. In addition,
we are obligated to use commercially reasonable efforts to refinance these
mortgages prior to their respective maturity dates in amounts not less than the
principal amount outstanding on the maturity date. With respect to 673 First
Avenue, Stephen Green controls at least 75% of the units whose approval is
necessary. With respect to 470 Park Avenue South, Stephen Green controls at
least 65% of the units whose approval is necessary. Finally, during this period,
we may not incur debt secured by any of these properties if the amount of our
new debt would exceed the greater of 75% of the value of the property securing
the debt or the amount of existing debt being refinanced plus associated costs.
The maturity date for the mortgage loan for 673 First Avenue is December 12,
2003 and the maturity date for the mortgage loan for 470 Park Avenue South is
April 1, 2004.

    In connection with future acquisitions of interests in properties, we may
agree to similar restrictions on our ability to sell or refinance the acquired
properties with similar potential adverse consequences.

    MEMBERS OF MANAGEMENT MAY HAVE A CONFLICT OF INTEREST OVER WHETHER TO
ENFORCE TERMS OF AGREEMENTS WITH ENTITIES IN WHICH SENIOR MANAGEMENT, DIRECTLY
OR INDIRECTLY, HAS AN INTEREST.  Two entities owned by one of Mr. Green's sons,
First Quality Maintenance, L.P. and Classic Security LLC, currently provide
cleaning and security services to all of our office properties, with the
exception of cleaning services at one property. SL Green and our tenants account
for approximately 37.5% of First Quality Maintenance, L.P.'s 2000 total revenue
and 46.0% of Classic Security LLC's 2000 total revenue. While the contracts
pursuant to which these services are provided are reviewed annually by the board
of directors, they are not the result of arm's length negotiations and,
therefore, there can be no assurance that the terms and conditions are not less
favorable than those which could be obtained from third parties providing
comparable services.

    MEMBERS OF MANAGEMENT MAY HAVE A CONFLICT OF INTEREST OVER WHETHER TO
ENFORCE TERMS OF SENIOR MANAGEMENT'S EMPLOYMENT AND NONCOMPETITION
AGREEMENTS.  Stephen Green, Marc Holliday, Michael Reid, Andrew Levine, Thomas
Wirth and Gerard Nocera entered into employment and noncompetition agreements
with us pursuant to which they have agreed not to engage in the acquisition,
development or operation of office real estate in the New York City metropolitan
area. However, Mr. Green has interests in two properties in Manhattan which are
exempt from the non-competition provisions of his employment and non-competition
agreement. For the most part these restrictions apply to the executive both
during their employment and for a period of time thereafter. Each executive is
also prohibited from otherwise disrupting or interfering with our business
through the solicitation of our employees or clients or otherwise. To the extent
that we choose to enforce our rights under any of these agreements, we may
determine to pursue available remedies, such as actions for damages or
injunctive relief, less vigorously than we otherwise might because of our desire
to maintain our ongoing relationship with the individual involved. Additionally,
the non-competition provisions of these agreements despite being limited in
scope and duration, could be difficult to enforce, or may be subject to limited
enforcement, should litigation arise over them in the future.

- FAILURE OF SL GREEN TO QUALIFY AS A REIT WOULD BE COSTLY.

    SL Green operates in a manner to qualify as a REIT for federal income tax
purposes. Many of these requirements, however, are highly technical and complex.
The determination that we are a REIT requires an analysis of factual matters and
circumstances. These matters, some of which may not be totally within our
control, can affect our qualification as a REIT. For example, to qualify as a
REIT, at least 95% of our gross income must come from designated sources that
are listed in the REIT tax laws. We are also required to distribute to
shareholders at least 90% of our REIT taxable income excluding capital gains.
The fact that we hold our assets through the operating partnership and its
subsidiaries further complicates the application of the REIT requirements. Even
a technical or inadvertent mistake

                                       9

could jeopardize our REIT status. Furthermore, Congress and the Internal Revenue
Service (the "IRS") might make changes to the tax laws and regulations, and the
courts might issue new rulings that make it more difficult, or impossible for us
to remain qualified as a REIT.

    If we fail to qualify as a REIT, we would be subject to federal income tax
at regular corporate rates. Also, unless the IRS grants us relief under specific
statutory provisions, we would remain disqualified as a REIT for four years
following the year we first failed to qualify. If we failed to qualify as a
REIT, we would have to pay significant income taxes and would therefore have
less money available for investments or for distributions to shareholders. This
would likely have a significant adverse effect on the value of our securities.
In addition, the REIT tax laws would no longer require us to make any
distributions to shareholders.

- WE ARE DEPENDENT ON EXTERNAL SOURCES OF CAPITAL.

    Because of distribution requirements imposed on us to qualify as a REIT, it
is not likely that we will be able to fund all future capital needs, including
acquisitions, from income from operations. We therefore will have to rely on
third-party sources of capital, which may or may not be available on favorable
terms or at all. Our access to third-party sources of capital depends on a
number of things, including the market's perception of our growth potential and
our current and potential future earnings. In addition, we anticipate having to
raise money in the public equity and debt markets with some regularity, and our
ability to do so will be dependent upon the general conditions prevailing in
these markets. Recent conditions have demonstrated that conditions may exist
which effectively prevent us, and REITs in general, from accessing these
markets. Moreover, additional equity offerings may result in substantial
dilution of our shareholders' interests, and additional debt financing may
substantially increase our leverage.

                FORWARD-LOOKING STATEMENTS MAY PROVE INACCURATE

    This document and the documents that are incorporated by reference contain
forward-looking statements that are subject to risks and uncertainties.
Forward-looking statements include information concerning possible or assumed
future results of our operations, including any forecasts, projections and plans
and objections for future operations. You can identify forward-looking
statements by the use of forward-looking expressions like "may," "will,"
"should," "expect," "anticipate," "estimate," or "continue" or any negative or
other variations on the expressions. Many factors could affect our actual
financial results, and could cause actual results to differ materially from
those in the forward-looking statements. These factors include the following:

    --  general economic or business conditions, either nationally or in New
       York City, being less favorable than expected;

    --  demand for office space;

    --  risks of real estate acquisition;

    --  availability and creditworthiness of prospective tenants;

    --  adverse changes in the real estate markets;

    --  unanticipated increases occurring in financing and other costs;

    --  competition with other companies;

    --  legislative or regulatory changes adversely affecting real estate
       investment trusts and the real estate business; and

    --  environmental and/or safety requirements.

                                       10

    We undertake no obligation to publicly update or revise any forward-looking
statements, whether as a result of new information, future events or otherwise.
In light of these risks and uncertainties, the forward-looking events and
circumstances discussed in this prospectus might not occur.

    You should rely only on the information contained or incorporated by
reference in this prospectus. We have not, and the underwriters have not,
authorized anyone to provide you with different information. If anyone provides
you with different or inconsistent information, you should not rely on it. We
are not, and the underwriters are not making an offer to sell these securities
in any jurisdiction where the offer or sale is not permitted. You should not
assume that the information contained or incorporated by reference in this
prospectus is accurate as of any date other than the date on the front cover of
this prospectus. Our business, financial condition, results of operations and
prospects may have changed since that date.

                                USE OF PROCEEDS

    The net proceeds to us from the sale of the securities offered hereby will
be used for general corporate purposes, which may include the repayment of
existing indebtedness, the development or acquisition of additional properties
as suitable opportunities arise and the renovation, expansion and improvement of
our existing properties. Further details relating to the use of the net proceeds
will be set forth in the applicable prospectus supplement.

                  RATIOS OF EARNINGS TO COMBINED FIXED CHARGES
                         AND PREFERRED STOCK DIVIDENDS

    Our ratios of earnings to combined fixed charges and preferred stock
dividends are as follows:



                                                            SL GREEN REALTY CORP.                       SL GREEN PREDECESSOR(1)
                                                               (CONSOLIDATED)                                  (COMBINED)
                                         -----------------------------------------------------------   --------------------------
                                           THREE
                                           MONTHS               YEAR ENDED              AUGUST 21,     JANUARY 1
                                           ENDED               DECEMBER 31                1997 TO       1997 TO      YEARS ENDED
                                         MARCH 31,    ------------------------------   DECEMBER 31,    AUGUST 20    DECEMBER 31,
                                            2001        2000       1999       1998         1997           1997          1996
                                         ----------   --------   --------   --------   -------------   ----------   -------------
                                                                                               
Ratio of Earnings to Combined Fixed
  Charges and Preferred Stock
  Dividends(2).........................     1.42        1.43       1.51       1.63          3.96           (3)           (3)


------------------------------

(1) The SL Green Predecessor is not a legal entity but rather a combination of
    real estate properties and affiliated real estate management, construction
    and leasing entities under common control and management of Mr. Green.

(2) Prior to completion of the initial public offering on August 20, 1997, the
    SL Green Predecessor operated in a manner as to minimize net taxable income
    to the owners. The initial public offering and the related formation
    transactions permitted us to deleverage our properties significantly,
    resulting in a significantly improved ratio of earnings to combined fixed
    charges and preferred stock dividends.

(3) For the period January 1, 1997 to August 20, 1997 and the year ended
    December 31, 1996, SL Green Predecessor fixed charge ratios were deficits of
    $100 and $3,470, respectively.

    The ratios of earnings to combined fixed charges and preferred stock
dividends were computed by dividing earnings by fixed charges, which includes
100% of majority owned non-combined entities of the SL Green Predecessor. For
this purpose, earnings consist of income or loss before gains from sale of
property and extraordinary items plus fixed charges. Fixed charges consist of
interest expense including interest costs capitalized, the amortization of debt
issuance costs and rental expense deemed to represent interest expense and has
been combined with preferred dividends which was associated with preferred stock
issued by SL Green during May 1998.

                                       11

                          DESCRIPTION OF COMMON STOCK

-  GENERAL

    SL Green's articles of incorporation provide that we may issue up to 100
million shares of common stock, $.01 par value per share. Subject to the
provisions of the articles of incorporation regarding excess stock, each
outstanding share of common stock entitles the holder to one vote on all matters
submitted to a vote of shareholders, including the election of directors, and,
except as provided with respect to any other class or series of stock, the
holders of this stock will possess the exclusive voting power. There is no
cumulative voting in the election of directors, which means that the holders of
a majority of the outstanding shares of common stock can elect all of the
directors then standing for election and the holders of the remaining shares
will not be able to elect any directors. On March 31, 2001, there were
24,705,163 shares of common stock outstanding.

    All shares of common stock offered hereby have been duly authorized, and
will be fully paid and nonassessable. Subject to the preferential rights of any
other shares or series of stock and to the provisions of the articles of
incorporation regarding excess stock, holders of shares of common stock are
entitled to receive dividends on this stock if, as and when authorized and
declared by the board of directors of SL Green out of assets legally available
therefor and to share ratably in the assets of SL Green legally available for
distribution to its shareholders in the event of its liquidation, dissolution or
winding up after payment of or adequate provision for all known debts and
liabilities of SL Green.

    Holders of shares of common stock have no preference, conversion, exchange,
sinking fund, redemption or appraisal rights and have no preemptive rights to
subscribe for any securities of SL Green. Subject to the provisions of the
articles of incorporation regarding excess stock, shares of common stock will
have equal dividend, liquidation and other rights.

-  PROVISIONS OF SL GREEN'S ARTICLES OF INCORPORATION

    The articles of incorporation authorize the board of directors to reclassify
any unissued shares of common stock into other classes or series of classes of
stock and to establish the number of shares in each class or series and to set
the preferences, conversion and other rights, voting powers, restrictions,
limitations and restrictions on ownership, limitations as to dividends or other
distributions, qualifications and terms or conditions of redemption for each
class or series.

    The board of directors is divided into three classes of directors, each
class constituting approximately one-third of the total number of directors,
with the classes serving staggered terms. At each annual meeting of
shareholders, the class of directors to be elected at the meeting will be
elected for a three-year term and the directors in the other two classes will
continue in office. We believe that classified directors will help to assure the
continuity and stability of the board of directors and our business strategies
and policies as determined by the board of directors. The use of a staggered
board may delay or defer a change in control of SL Green or removal of incumbent
management.

-  RESTRICTIONS ON OWNERSHIP

    For SL Green to qualify as a REIT under the Internal Revenue Code of 1986,
as amended (the "Code"), not more than 50% in value of its outstanding common
stock may be owned, directly or indirectly, by five or fewer individuals,
according to the definition in the Code, during the last half of a taxable year
and the common stock must be beneficially owned by 100 or more persons during at
least 335 days of a taxable year of 12 months or during a proportionate part of
a shorter taxable year. To satisfy the above ownership requirements and other
requirements for qualification as a REIT, the board of directors has adopted,
and the shareholders prior to the initial public offering approved, a provision
in the articles of incorporation restricting the ownership or acquisition of
shares of common stock. See "Restrictions on Ownership of Capital Stock."

                                       12

-  TRANSFER AGENT AND REGISTRAR

    The transfer agent and registrar for the common stock is The Bank of New
York.

                         DESCRIPTION OF PREFERRED STOCK

-  GENERAL

    The articles of incorporation provides that we may issue up to 25 million
shares of preferred stock, $.01 par value per share. On March 31, 2001 there
were 4,600,000 shares of preferred stock outstanding.

    The following description of the preferred stock sets forth general terms
and provisions of the preferred stock to which any prospectus supplement may
relate. The statements below describing the preferred stock are in all respects
subject to and qualified in their entirety by reference to the applicable
provisions of the articles of incorporation and bylaws of SL Green and any
applicable articles supplementary to the articles of incorporation designating
terms of a series of preferred stock.

    The issuance of preferred stock could adversely affect the voting power,
dividend rights and other rights of holders of common stock. Although the board
of directors does not have this intention at the present time, it could
establish a series of preferred stock that could, depending on the terms of the
series, delay, defer or prevent a transaction or a change in control of SL Green
that might involve a premium price for the common stock or otherwise be in the
best interest of the holders thereof. Management believes that the availability
of preferred stock will provide SL Green with increased flexibility in
structuring possible future financing and acquisitions and in meeting other
needs that might arise.

TERMS

    Subject to the limitations prescribed by the articles of incorporation, the
board of directors is authorized to fix the number of shares constituting each
series of preferred stock and the designations and powers, preferences and
relative, participating, optional or other special rights and qualifications,
limitations or restrictions thereof, including provisions as may be desired
concerning voting, redemption, dividends, dissolution or the distribution of
assets, conversion or exchange, and other subjects or matters as may be fixed by
resolution of the board of directors. The preferred stock will, when issued, be
fully paid and nonassessible by SL Green and will have no preemptive rights.

    Reference is made to the prospectus supplement relating to the series of
preferred stock offered thereby for the specific terms thereof, including:

    --  The title and stated value of the preferred stock;

    --  The number of shares of the preferred stock, the liquidation preference
       per share of the preferred stock and the offering price of the preferred
       stock;

    --  The dividend rate(s), period(s) and/or payment day(s) or method(s) of
       calculation thereof applicable to the preferred stock;

    --  The date from which dividends on the preferred stock shall accumulate,
       if applicable;

    --  The procedures for any auction and remarketing, if any, for the
       preferred stock;

    --  The provision for a sinking fund, if any, for the preferred stock;

    --  The provision for redemption, if applicable, of the preferred stock;

    --  Any listing of the preferred stock on any securities exchange;

                                       13

    --  The terms and conditions, if applicable, upon which the preferred stock
       may or will be convertible into common stock of SL Green, including the
       conversion price or manner of calculation thereof;

    --  The relative ranking and preferences of the preferred stock as to
       dividend rights and rights upon liquidation, dissolution or winding up of
       the affairs of SL Green;

    --  Any limitations on direct or beneficial ownership and restrictions on
       transfer, in each case as may be appropriate to preserve the status of SL
       Green as a REIT;

    --  A discussion of federal income tax considerations applicable to the
       preferred stock; and

    --  Any other specific terms, preferences, rights, limitations or
       restrictions of the preferred stock.

RANK

    Unless otherwise specified in the applicable prospectus supplement, the
preferred stock will, with respect to dividend rights and rights upon
liquidation, dissolution or winding up of SL Green, rank:

        (a) senior to all classes or series of common stock and to all equity
    securities issued by SL Green the terms of which provide that the equity
    securities shall rank junior to the preferred stock;

        (b) on a parity with all equity securities issued by SL Green other than
    those referred to in clauses (a) and (c); and

        (c) junior to all equity securities issued by SL Green which the terms
    of the preferred stock provide will rank senior to it. The term "equity
    securities" does not include convertible debt securities.

DIVIDENDS

    Unless otherwise specified in the applicable prospectus supplement, the
preferred stock will have the rights with respect to payment of dividends set
forth below.

    Holders of the preferred stock of each series will be entitled to receive,
when, as and if declared by the board of directors, out of assets of SL Green
legally available for payment, cash dividends in the amounts and on the dates as
will be set forth in, or pursuant to, the applicable prospectus supplement. Each
dividend shall be payable to holders of record as they appear on the share
transfer books of SL Green on the record dates as shall be fixed by the board of
directors.

    Dividends on any series of preferred stock may be cumulative or
non-cumulative, as provided in the applicable prospectus supplement. Dividends,
if cumulative, will be cumulative from and after the date set forth in the
applicable prospectus supplement. If the board of directors fails to declare a
dividend payable on a dividend payment date on any series of preferred stock for
which dividends are non-cumulative, then the holders of this series of preferred
stock will have no right to receive a dividend in respect of the related
dividend period and SL Green will have no obligation to pay the dividend accrued
for the period, whether or not dividends on this series of preferred stock are
declared payable on any future dividend payment date.

    If preferred stock of any series is outstanding, no full dividends will be
declared or paid or set apart for payment on any capital stock of SL Green of
any other series ranking, as to dividends, on a parity with or junior to the
preferred stock of this series for any period unless:

    --  if this series of preferred stock has a cumulative dividend, full
       cumulative dividends have been or contemporaneously are declared and paid
       or declared and a sum sufficient for the payment

                                       14

       thereof set apart for the payment for all past dividend periods and the
       then current dividend period; or

    --  if this series of preferred stock does not have a cumulative dividend,
       full dividends for the then current dividend period have been or
       contemporaneously are declared and paid or declared and a sum sufficient
       for the payment thereof set apart for the payment on the preferred stock
       of this series.

    When dividends are not paid in full or a sum sufficient for the full payment
is not so set apart upon preferred stock of any series and the shares of any
other series of preferred stock ranking on a parity as to dividends with the
preferred stock of this series, all dividends declared upon the preferred stock
of this series and any other series of preferred stock ranking on a parity as to
dividends with the preferred stock shall be declared PRO RATA so that the amount
of dividends declared per share of preferred stock of this series and the other
series of preferred stock shall in all cases bear to each other the same ratio
that accrued dividends per share on the preferred stock of this series and the
other series of preferred stock which shall not include any accumulation in
respect of unpaid dividends for prior dividend periods if the preferred stock
does not have a cumulative dividend, bear to each other. No interest, or sum of
money in lieu of interest, shall be payable in respect of any dividend payment
or payments on preferred stock of this series which may be in arrears.

    Except as provided in the immediately preceding paragraph, unless (a) if
this series of preferred stock has a cumulative dividend, full cumulative
dividends on the preferred stock of this series have been or contemporaneously
are declared and paid or declared and a sum sufficient for the payment thereof
set apart for payment for all past dividend periods and the then current
dividend period, and if this series of preferred stock does not have a
cumulative dividend, full dividends on the preferred stock of this series have
been or contemporaneously are declared and paid or declared and a sum sufficient
for the payment thereof set apart for payment for the then current dividend
period, no dividends, other than in shares of common stock or other capital
stock ranking junior to the preferred stock of this series as to dividends and
upon liquidation, shall be declared or paid or set aside for payment or other
distribution shall be declared or made upon the common stock, or any other
capital stock of SL Green ranking junior to or on a parity with the preferred
stock of this series as to dividends or upon liquidation, nor shall any shares
of common stock, or any other capital stock of SL Green ranking junior to or on
a parity with the preferred stock of this series as to dividends or upon
liquidation, be redeemed, purchased or otherwise acquired for any consideration
or any moneys be paid to or made available for a sinking fund for the redemption
of any of the shares by SL Green except:

    --  by conversion into or exchange for other capital stock of SL Green
       ranking junior to the preferred stock of this series as to dividends and
       upon liquidation; or

    --  redemptions for the purpose of preserving SL Green's status as a REIT.

REDEMPTION

    If so provided in the applicable prospectus supplement, the preferred stock
will be subject to mandatory redemption or redemption at the option of SL Green,
as a whole or in part, in each case upon the terms, at the times and at the
redemption prices set forth in the prospectus supplement.

    The prospectus supplement relating to a series of preferred stock that is
subject to mandatory redemption will specify the number of shares of the
preferred stock that shall be redeemed by SL Green in each year commencing after
a date to be specified, at a redemption price per share to be specified,
together with an amount equal to all accumulated and unpaid dividends thereon
which shall not, if the preferred stock does not have a cumulative dividend,
include any accumulation in respect of unpaid dividends for prior dividend
periods, to the date of redemption. The redemption price may be payable in cash
or other property, as specified in the applicable prospectus supplement. If the

                                       15

redemption price for preferred stock of any series is payable only from the net
proceeds of the issuance of capital stock of SL Green, the terms of the
preferred stock may provide that, if no capital stock shall have been issued or
to the extent the net proceeds from any issuance are insufficient to pay in full
the aggregate redemption price then due, the preferred stock shall automatically
and mandatorily be converted into the applicable capital stock of SL Green
pursuant to conversion provisions specified in the applicable prospectus
supplement.

    Notwithstanding the foregoing, unless (a) if this series of preferred stock
has a cumulative dividend, full cumulative dividends on all shares of any series
of preferred stock shall have been or contemporaneously are declared and paid or
declared and a sum sufficient for the payment thereof set apart for payment for
all past dividend periods and the then current dividend period, and (b) if this
series of preferred stock does not have a cumulative dividend, full dividends on
the preferred stock of any series have been or contemporaneously are declared
and paid or declared and a sum sufficient for the payment thereof set apart for
payment for the then current dividend period, no shares of any series of
preferred stock shall be redeemed unless all outstanding preferred stock of this
series is simultaneously redeemed; PROVIDED, HOWEVER, that the foregoing shall
not prevent the purchase or acquisition of preferred stock of this series to
preserve the REIT status of SL Green or pursuant to a purchase or exchange offer
made on the same terms to holders of all outstanding preferred stock of this
series. In addition, unless (a) if this series of preferred stock has a
cumulative dividend, full cumulative dividends on all outstanding shares of any
series of preferred stock have been or contemporaneously are declared and paid
or declared and a sum sufficient for the payment thereof set apart for payment
for all past dividend periods and the then current dividend period, and (b) if
this series of preferred stock does not have a cumulative dividend, full
dividends on the preferred stock of any series have been or contemporaneously
are declared and paid or declared and a sum sufficient for the payment thereof
set apart for payment for the then current dividend period, SL Green shall not
purchase or otherwise acquire, directly or indirectly, any shares of preferred
stock of this series except by conversion into or exchange for capital stock of
SL Green ranking junior to the preferred stock of this series as to dividends
and upon liquidation; PROVIDED, HOWEVER, that the foregoing shall not prevent
the purchase or acquisition of preferred stock of this series to preserve the
REIT status of SL Green or pursuant to a purchase or exchange offer made on the
same terms to holders of all outstanding preferred stock of this series.

    If fewer than all of the outstanding shares of preferred stock of any series
are to be redeemed, the number of shares to be redeemed will be determined by SL
Green and the shares may be redeemed PRO RATA from the holders of record of the
shares in proportion to the number of the shares held or for which redemption is
requested by the holder, with adjustments to avoid redemption of fractional
shares, or by lot in a manner determined by SL Green.

    Notice of redemption will be mailed at least 30 days but not more than 60
days before the redemption date to each holder of record of preferred stock of
any series to be redeemed at the address shown on the share transfer books of SL
Green. Each notice shall state:

    --  the redemption date;

    --  the number of shares and series of the preferred stock to be redeemed;

    --  the redemption price;

    --  the place or places where certificates for the preferred stock are to be
       surrendered for payment of the redemption price;

    --  that dividends on the shares to be redeemed will cease to accumulate on
       the redemption date; and

    --  the date upon which the holder's conversion rights, if any, as to the
       shares shall terminate.

                                       16

    If fewer than all the shares of preferred stock of any series are to be
redeemed, the notice mailed to each holder thereof shall also specify the number
of shares of preferred stock to be redeemed from each holder. If notice of
redemption of any preferred stock has been given and if the funds necessary for
the redemption have been set aide by SL Green in trust for the benefit of the
holders of any preferred stock so called for redemption, then from and after the
redemption date dividends will cease to accumulate on the preferred stock, and
all rights of the holders of the preferred stock will terminate, except the
right to receive the redemption price.

-  LIQUIDATION PREFERENCE

    Upon any voluntary or involuntary liquidation, dissolution or winding up of
the affairs of SL Green, then, before any distribution or payment shall be made
to the holders of any common stock or any other class or series of capital stock
of SL Green ranking junior to the preferred stock of this series in the
distribution of assets upon any liquidation, dissolution or winding up of SL
Green, the holders of the preferred stock shall be entitled to receive out of
assets of SL Green legally available for distribution to shareholders
liquidating distributions in the amount of the liquidation preference per share
that is set forth in the applicable prospectus supplement, plus an amount equal
to all dividends accumulated and unpaid thereon, which shall not include any
accumulation in respect of unpaid dividends for prior dividend periods if the
preferred stock does not have a cumulative dividend. After payment of the full
amount of the liquidating distributions to which they are entitled, the holders
of preferred stock will have no rights or claim to any of the remaining assets
of SL Green. In the event that, upon any voluntary or involuntary liquidation,
dissolution or winding up, the available assets of SL Green are insufficient to
pay the amount of the liquidating distributions on all outstanding preferred
stock of this series and the corresponding amounts payable on all shares of
other classes or series of capital stock of SL Green ranking on a parity with
the preferred stock in the distribution of assets, then the holders of the
preferred stock and all other classes or series of capital stock shall share
ratably in any distribution of assets in proportion to the full liquidating
distributions to which they would otherwise be respectively entitled.

    The consolidation or merger of SL Green with or into any other entity, or
the merger of another entity with or into SL Green, or a statutory share
exchange by SL Green, or the sale, lease or conveyance of all or substantially
all of the property or business of SL Green, shall not be deemed to constitute a
liquidation, dissolution or winding up of SL Green.

-  VOTING RIGHTS

    Holders of the preferred stock will not have any voting rights, except as
set forth below or as otherwise from time to time required by law or as
indicated in the applicable prospectus supplement.

    Whenever dividends on any series of preferred stock shall be in arrears for
six or more quarterly periods, the holders of the preferred stock, voting
separately as a class with all other series of preferred stock upon which like
voting rights have been conferred and are exercisable, will be entitled to vote
for the election of two additional directors of SL Green at a special meeting
called by the holders of record of at least ten percent of any series of
preferred stock so in arrears, unless the request is received less than 90 days
before the date fixed for the next annual or special meeting of the
shareholders, or at the next annual meeting of shareholders, and at each
subsequent annual meeting until (a) if this series of preferred stock has a
cumulative dividend, all dividends accumulated on these shares of preferred
stock for the past dividend periods and the then current dividend period shall
have been fully paid or declared and a sum sufficient for the payment thereof
set aside for payment or (b) if this series of preferred stock does not have a
cumulative dividend, four quarterly dividends shall have been fully paid or
declared and a sum sufficient for the payment thereof set aside for payment. In
these cases, the entire board of directors will be increased by two directors.

                                       17

    Unless provided otherwise for any series of preferred stock, so long as any
shares of the preferred stock remain outstanding, SL Green will not, without the
affirmative vote or consent of the holders of at least two-thirds of the shares
of this series of preferred stock outstanding at the time, given in person or by
proxy, either in writing or at a meeting with this series voting separately as a
class:

        (a) authorize or create, or increase the authorized or issued amount of,
    any class or series of capital stock ranking senior to the preferred stock
    with respect to payment of dividends or the distribution of assets upon
    liquidation, dissolution or winding up of SL Green, or reclassify any
    authorized capital stock of SL Green into the stock, or create, authorize or
    issue any obligation or security convertible into or evidencing the right to
    purchase any of this stock; or

        (b) amend, alter or repeal the provisions of the articles of
    incorporation or the designating amendment for this series of preferred
    stock, whether by merger, consolidation or otherwise, so as to materially
    and adversely affect any right, preference, privilege or voting power of
    this series of preferred stock or the holders thereof;

    PROVIDED, HOWEVER, with respect to the occurrence of any of the events set
forth in (b) above, so long as this series of preferred stock remains
outstanding with the terms thereof materially unchanged, taking into account
that upon the occurrence of an event SL Green may not be the surviving entity,
the occurrence of any similar event shall not be deemed to materially and
adversely affect the rights, preferences, privileges or voting powers of holders
of this series of preferred stock; and provided, further, that (x) any increase
in the amount of the authorized preferred stock or the creation or issuance of
any other series of preferred stock, or (y) any increase in the amount of
authorized shares of this series of preferred stock or any other series of
preferred stock, in each case ranking on a parity with or junior to the
preferred stock of this series with respect to payment of dividends or the
distribution of assets upon liquidation, dissolution or winding up of SL Green,
shall not be deemed to materially and adversely affect the rights, preferences,
privileges or voting powers.

    The foregoing voting provisions will not apply if, at or prior to the time
when the act with respect to which the vote or consent would otherwise be
required shall be effected, all outstanding shares of this series of preferred
stock shall have been converted, redeemed or called for redemption and
sufficient funds shall have been deposited in trust to effect the redemption.

CONVERSION RIGHTS

    The terms and conditions, if any, upon which any series of preferred stock
is convertible into shares of common stock will be set forth in the applicable
prospectus supplement. The terms will include the number of shares of common
stock into which the shares of preferred stock are convertible, the conversion
price, or manner of calculation thereof, the conversion period, provisions as to
whether conversion will be at the option of the holders of the preferred stock
or SL Green, the events requiring an adjustment of the conversion price and
provisions affecting conversion in the event of the redemption of the preferred
stock.

SHAREHOLDER LIABILITY

    As discussed above under "Description of Common Stock--General," applicable
Maryland law provides that no shareholder, including holders of preferred stock,
shall be personally liable for the acts and obligations of SL Green and that the
funds and property of SL Green shall be the only recourse for these acts or
obligations.

RESTRICTIONS ON OWNERSHIP

    As discussed below under "Restrictions on Ownership of Capital Stock," for
SL Green to qualify as a REIT under the Code, not more than 50% in value of its
outstanding capital stock may be owned, directly or indirectly, by five or fewer
individuals. An individual for these purposes is defined by the

                                       18

federal income tax laws pertaining to REITs and is very complex. Therefore, the
designating amendment for each series of preferred stock may contain provisions
restricting the ownership and transfer of the preferred stock. The applicable
prospectus supplement will specify any additional ownership limitation relating
to a series of preferred stock.

REGISTRAR AND TRANSFER AGENT

    The Registrar and Transfer Agent for the preferred stock is The Bank of New
York.

                   RESTRICTIONS ON OWNERSHIP OF CAPITAL STOCK

EXCESS STOCK

    The articles of incorporation provide that SL Green may issue up to 75
million shares of excess stock, par value $.01 per share. For a Description of
Excess Stock, See "--Restrictions on Ownership" below.

RESTRICTIONS ON OWNERSHIP

    For SL Green to qualify as a REIT under the Code, among other things, not
more than 50% in value of its outstanding capital stock may be owned, directly
or indirectly, by five or fewer individuals during the last half of a taxable
year, other than the first year, and the shares of capital stock must be
beneficially owned by 100 or more persons during at least 335 days of a taxable
year of 12 months, other than the first year, or during a proportionate part of
a shorter taxable year. Pursuant to the Code, common stock held by specific
types of entities, such as pension trusts qualifying under Section 401(a) of the
Code, United States investment companies registered under the Investment Company
Act of 1940, partnerships, trusts and corporations, will be attributed to the
beneficial owners of these entities for purposes of the five or fewer
requirement: generally, the beneficial owners of these entities will be counted
as shareholders of SL Green.

    In order to protect SL Green against the risk of losing its status as a REIT
due to a concentration of ownership among its shareholders, its articles of
incorporation, subject to exceptions, provide that no shareholder may own, or be
deemed to own by virtue of the attribution provisions of the Code, more than
9.0%, which we refer to as the "Ownership Limit," of the aggregate number or
value of SL Green's outstanding shares of common stock. Limitations on the
ownership of preferred stock may also be imposed by SL Green. See "Description
of Preferred Stock--Restrictions on Ownership." Any direct or indirect ownership
of shares of stock in excess of the Ownership Limit or that would result in the
disqualification of SL Green as a REIT, including any transfer that results in
shares of capital stock being owned by fewer than 100 persons or results in SL
Green being "closely held" within the meaning of Section 856(h) of the Code,
shall be null and void, and the intended transferee will acquire no rights to
the shares of capital stock. The foregoing restrictions on transferability and
ownership will not apply if the board of directors determines that it is no
longer in the best interests of SL Green to attempt to qualify, or to continue
to qualify, as a REIT. The board of directors may, in its sole discretion, waive
the Ownership Limit if evidence satisfactory to the board of directors and SL
Green's tax counsel is presented that the changes in ownership will not then or
in the future jeopardize SL Green's REIT status and the board of directors
otherwise decides that this action is in the best interest of SL Green.

    Shares of capital stock owned, or deemed to be owned, or transferred to a
shareholder in excess of the Ownership Limit will automatically be converted
into shares of excess stock that will be transferred, by operation of law, to
the trustee of a trust for the exclusive benefit of one or more charitable
organizations described in Section 170(b)(1)(A) and 170(c) of the Code. The
trustee of the trust will be deemed to own the excess stock for the benefit of
the charitable beneficiary on the date of the violative transfer to the original
transferee-shareholder. Any dividend or distribution paid to the original
transferee-shareholder of excess stock prior to the discovery by SL Green that
capital stock has been transferred in violation of the provisions of SL Green's
articles of incorporation shall be repaid to the

                                       19

trustee upon demand. Any dividend or distribution authorized and declared but
unpaid shall be rescinded as void from the beginning with respect to the
original transferee-shareholder and shall instead be paid to the trustee of the
trust for the benefit of the charitable beneficiary. Any vote cast by an
original transferee-shareholder of shares of capital stock constituting excess
stock prior to the discovery by SL Green that shares of capital stock have been
transferred in violation of the provisions of the articles of incorporation
shall be rescinded as void from the beginning. While the excess stock is held in
trust, the original transferee-shareholder will be deemed to have given an
irrevocable proxy to the trustee to vote the capital stock for the benefit of
the charitable beneficiary. The trustee of the trust may transfer the interest
in the trust representing the excess stock to any person whose ownership of the
shares of capital stock converted into this excess stock would be permitted
under the Ownership Limit. If this transfer is made, the interest of the
charitable beneficiary shall terminate and the proceeds of the sale shall be
payable to the original transferee shareholder and to the charitable beneficiary
as described herein. The original transferee-shareholder shall receive the
lesser of (a) the price paid by the original transferee-shareholder for the
shares of capital stock that were converted into excess stock or, if the
original transferee-shareholder did not give value for the shares, the average
closing price for the class of shares from which the shares of capital stock
were converted for the ten trading days immediately preceding the sale or gift,
and (b) the price received by the trustee from the sale or other disposition of
the excess stock held in trust. The trustee may reduce the amount payable to the
original transferee-shareholder by the amount of dividends and distributions
relating to the shares of excess stock which have been paid to the original
transferee-shareholder and are owed by the original transferee-shareholder to
the trustee. Any proceeds in excess of the amount payable to the original
transferee-shareholder shall be paid by the trustee to the charitable
beneficiary. Any liquidation distributions relating to excess stock shall be
distributed in the same manner as proceeds of a sale of excess stock. If the
foregoing transfer restrictions are determined to be void or invalid by virtue
of any legal decision, statute, rule or regulations, then the original
transferee-shareholder of any shares of excess stock may be deemed, at the
option of SL Green, to have acted as an agent on behalf of SL Green in acquiring
the shares of excess stock and to hold the shares of excess stock on behalf of
SL Green.

    In addition, SL Green will have the right, for a period of 90 days during
the time any shares of excess stock are held in trust, to purchase all or any
portion of the shares of excess stock at the lesser of (a) the price initially
paid for the shares by the original transferee-shareholder, or if the original
transferee-shareholder did not give value for the shares, the average closing
price for the class of stock from which the shares of excess stock were
converted for the ten trading days immediately preceding the sale or gift, and
(b) the average closing price for the class of stock from which the shares of
excess stock were converted for the ten trading days immediately preceding the
date SL Green elects to purchase the shares. SL Green may reduce the amount
payable to the original transferee-shareholder by the amount of dividends and
distributions relating to the shares of excess stock which have been paid to the
original transferee-shareholder and are owed by the original
transferee-shareholder to the trustee. SL Green may pay the amount of the
reductions to the trustee for the benefit of the charitable beneficiary. The
90-day period begins on the later date of which notice is received of the
violative transfer if the original transferee-shareholder gives notice to SL
Green of the transfer or, if no notice is given, the date the board of directors
determines that a violative transfer has been made.

    These restrictions will not preclude settlement of transactions through the
New York Stock Exchange.

    All certificates representing shares of stock will bear a legend referring
to the restrictions described above.

    Each shareholder shall upon demand be required to disclose to SL Green in
writing any information with respect to the direct, indirect and constructive
ownership of capital stock of SL Green as the board of directors deems necessary
to comply with the provisions of the Code applicable to

                                       20

REITs, to comply with the requirements of any taxing authority or governmental
agency or to determine any such compliance.

    The Ownership Limit may have the effect of delaying, deferring or preventing
a change in control of SL Green unless the board of directors determines that
maintenance of REIT status is no longer in the best interest of SL Green.

                    MATERIAL FEDERAL INCOME TAX CONSEQUENCES

    The following discussion summarizes the material federal income tax
consequences that are generally applicable to prospective holders of the offered
securities. The specific tax consequences of owning the offered securities will
vary depending on the circumstances of a particular stockholder. The discussion
contained herein does not address all aspects of federal income taxation that
may be relevant to particular holders. Therefore, we strongly recommend that
stockholders review the following discussion and then consult with a tax advisor
to determine the anticipated tax consequences of owning the offered securities.

    The information in this section and the opinions of Sidley Austin Brown &
Wood LLP are based on the Code, existing and proposed Treasury Regulations
thereunder, current administrative interpretations and court decisions. We
cannot assume that future legislation, Treasury Regulations, administrative
interpretations and court decisions will not significantly change current law or
affect existing interpretations of current law in a manner which is adverse to
stockholders. Any such change could apply retroactively to transactions
preceding the date of change. With the exception of the ruling below, SL Green
and the operating partnership do not plan to obtain any rulings from the IRS
concerning any tax issue with respect to SL Green other than that described
below under Taxation of SL Green "Requirements for Qualification" Income Tests.
Thus, we cannot assume that the opinions and statements set forth herein, which
do not bind the IRS or the courts, will not be challenged by the IRS or will be
sustained by a court if so challenged.

    This summary does not discuss state, local or foreign tax considerations.
Except where indicated, the discussion below describes general federal income
tax considerations applicable to individuals who are U.S. persons for federal
income tax purposes and who hold the offered securities as "capital assets"
within the meaning of Section 1221 of the Code. Accordingly, the following
discussion has limited application to domestic corporations and persons subject
to specialized federal income tax treatment, such as foreign persons, trusts,
estates, tax-exempt entities, regulated investment companies and insurance
companies.

    Under applicable Treasury regulations a provider of advice on specific
issues of law is not considered an income tax return preparer unless the advice
is (i) given with respect to events that have occurred at the time the advice is
rendered and is not given with respect to the consequences of contemplated
actions, and (ii) is directly relevant to the determination of an entry on a tax
return. Accordingly, prospective stockholders should consult their respective
tax advisors and tax return preparers regarding the preparation of any item on a
tax return, even where the anticipated tax treatment has been discussed herein.
IN ADDITION, PROSPECTIVE STOCKHOLDERS ARE URGED TO CONSULT WITH THEIR OWN TAX
ADVISORS WITH REGARD TO THE APPLICATION OF THE FEDERAL INCOME TAX LAWS TO SUCH
STOCKHOLDERS' RESPECTIVE PERSONAL TAX SITUATIONS, AS WELL AS ANY TAX
CONSEQUENCES ARISING UNDER THE LAWS OF ANY STATE, LOCAL OR FOREIGN TAXING
JURISDICTION.

TAXATION OF SL GREEN

    We elected to be taxed as a REIT under Sections 856 through 860 of the Code
effective for our taxable year ending December 31, 1997. In the opinion of
Sidley Austin Brown & Wood LLP, commencing with our taxable year ended December
31, 1997, we have been organized in conformity with the requirements for
qualification and taxation as a REIT under the Code and our method of operation
enables us to meet the requirements for qualification and taxation as a REIT.
This opinion is

                                       21

based on factual representations relating to the organization and operation of
SL Green, the operating partnership, their respective subsidiaries, and factual
representations relating to our continued efforts to comply with the various
REIT tests. Qualification and taxation as a REIT depends upon our ability to
meet on a continuing basis, through actual annual operating results, the various
qualification tests imposed under the Code. Sidley Austin Brown & Wood LLP will
not review compliance with these tests on a continuing basis. See "Failure to
Qualify" below.

    The following is a general summary of the material Code provisions that
govern the federal income tax treatment of a REIT and its stockholders. These
provisions of the Code are highly technical and complex.

    If we qualify for taxation as a REIT, we generally will not be subject to
federal corporate income taxes on net income that we distribute currently to
stockholders. This treatment substantially eliminates the double taxation
(taxation at both the corporate and stockholder levels) that generally results
from investment in a corporation. However, we will be subject to federal income
and excise tax in specific circumstances, including the following:

    - we will be taxed at regular corporate rates on any undistributed REIT
      taxable income, including undistributed net capital gains, other than
      retained capital gains as discussed below.

    - we may be subject to the alternative minimum tax on our items of tax
      preference.

    - if we have (a) net income from the sale or other disposition of
      foreclosure property, which is, in general, property acquired by
      foreclosure or otherwise on default of a loan secured by the property,
      held primarily for sale to customers in the ordinary course of business or
      (b) other nonqualifying income from foreclosure property, we will be
      subject to tax at the highest corporate rate on such income.

    - if we have net income from prohibited transactions, which are, in general,
      sales or other dispositions of property held primarily for sale to
      customers in the ordinary course of business, such income will be subject
      to a 100% tax.

    - if we fail to satisfy either the 75% gross income test or the 95% gross
      income test, but nonetheless maintain our qualification as a REIT because
      other requirements have been met, we will be subject to a 100% tax on the
      greater of the amount by which we fail the 75% or 95% test, multiplied by
      a fraction intended to reflect our profitability.

    - if we fail to distribute during each calendar year at least the sum of (a)
      85% of our REIT ordinary income for such year, (b) 95% of our REIT capital
      gain net income for such year and (c) any undistributed taxable income
      from prior years, we will be subject to a 4% excise tax on the excess of
      such required distribution over the amounts actually distributed.

    - if we acquire any asset from a corporation generally subject to full
      corporate level tax in a transaction in which the basis of the asset in
      our hands is determined by reference to the basis of the asset in the
      hands of the seller and we recognize gain on the disposition of such asset
      during the ten-year period beginning on the date on which such asset was
      acquired by us, then we will be subject to the built-in gain rule.
      Built-in gain is the excess of the fair market value of such property at
      the time of acquisition by SL Green over the adjusted basis in such
      property at such time. Under the built-in gain rule, such gain will be
      subject to tax at the highest regular corporate rate applicable.

    - if it is determined that amounts of certain income and expense were not
      allocated between us and a Taxable REIT Subsidiary (as defined herein) on
      the basis of arm's length dealing, we will be subject to a tax equal to
      100% of those amounts.

                                       22

REQUIREMENTS FOR QUALIFICATION

    The Code defines a REIT as a corporation, trust, or association

    (a) that is managed by one or more trustees or directors;

    (b) the beneficial ownership of which is evidenced by transferable shares or
       by transferable certificates of beneficial interest;

    (c) that would be taxable as a domestic corporation, but for Section 856
       through 859 of the Code;

    (d) that is neither a financial institution nor an insurance company subject
       to specific provisions of the Code;

    (e) the beneficial ownership of which is held by 100 or more persons;

    (f) during the last half of each taxable year not more than 50% in value of
       the outstanding stock of which is owned, directly or indirectly, by five
       or fewer individuals; and

    (g) that meets other tests, described below, regarding the nature of its
       income and assets.

    The Code provides that conditions (a) through (d), inclusive, must be met
during the entire taxable year and that condition (e) must be met during at
least 335 days of a taxable year of 12 months, or during a proportionate part of
a taxable year of less than 12 months. Conditions (e) and (f), however, will not
apply until after the first taxable year for which an election is made to be
taxed as a REIT. We believe we have issued and have outstanding sufficient
shares of stock with sufficient diversity of ownership to allow us to satisfy
conditions (e) and (f). In addition, we intend to comply with Treasury
Regulations requiring us to ascertain the actual ownership of our outstanding
shares. Our articles of incorporation include restrictions regarding the
transfer of shares of capital stock that are intended to assist us in continuing
to satisfy the share ownership requirements described in (e) and (f) above. See
"Restrictions on Ownership of Capital Stock."

    If a REIT owns a corporate subsidiary that is a qualified REIT subsidiary,
that subsidiary is disregarded for federal income tax purposes and all assets,
liabilities and items of income, deduction and credit of the subsidiary are
treated as assets, liabilities and items of the REIT itself. Similarly, a single
member limited liability company owned by the REIT or by the operating
partnership is disregarded as a separate entity for federal income tax purposes.

    In the case of a REIT that is a partner in a partnership, Treasury
Regulations provide that for purposes of the gross income tests and asset tests,
the REIT will be deemed to own its proportionate share, based on its interest in
partnership capital, of the assets of the partnership and will be deemed to be
entitled to the income of the partnership attributable to such share. In
addition, the assets and gross income of the partnership will retain the same
character in the hands of the REIT for purposes of Section 856 of the Code,
including satisfying the gross income tests and asset tests, that they have in
the hands of the partnership. Thus, our proportionate share of the assets,
liabilities and items of gross income of the operating partnership will be
treated as our assets, liabilities and items of gross income for purposes of
applying the requirements described herein.

    INCOME TESTS.  In order to maintain qualification as a REIT, we must
annually satisfy gross income tests. First, at least 75% of the REIT's gross
income, excluding gross income from specific prohibited transactions, for each
taxable year must be derived directly or indirectly from investments relating to
real property or mortgages on real property, including rents from real property
and, in specific circumstances, from certain types of temporary investments.
Second, at least 95% of the REIT's gross income, excluding gross income from
prohibited transactions, for each taxable year must be derived from such real
property investments described above and from dividends, interest and gain from
the sale or disposition of stock or securities, or from any combination of the
foregoing. If we fail to satisfy one or both of the 75% or the 95% gross income
tests for any taxable year, we nevertheless may

                                       23

qualify as a REIT for such year if we are entitled to relief under specific
provisions of the Code. These relief provisions generally are available if our
failure to meet any such tests was due to reasonable cause and not due to
willful neglect, we attach a schedule of the sources of our income to our
federal corporate income tax return and any incorrect information on the
schedule was not due to fraud with intent to evade tax. It is not possible,
however, to state whether in all circumstances we would be entitled to the
benefit of these relief provisions. As discussed above, even if these relief
provisions were to apply, a tax would be imposed with respect to the excess net
income.

    For purposes of the income test, rents received by a REIT will qualify as
rents from real property only if the following conditions are met:

    - the amount of rent must not be based in whole or in part on the income or
      profits of any person. However, an amount received or accrued generally
      will not be excluded from rents from real property solely by reason of
      being based on a fixed percentage or percentages of receipts or sales.

    - rents received from a tenant will not qualify as rents from real property
      in satisfying the gross income tests if the REIT, or a direct or indirect
      owner of 10% or more of the REIT, directly or constructively, owns 10% or
      more of such tenant.

    - if rent attributable to personal property, leased in connection with a
      lease of real property, is greater than 15% of the total rent received
      under the lease, then the portion of rent attributable to such personal
      property will not qualify as rents from real property.

    - the REIT generally must not operate or manage the property or furnish or
      render services to tenants, except through a Taxable REIT Subsidiary (as
      defined herein) or through an independent contractor who is adequately
      compensated and from whom the REIT derives no income.

    The independent contractor requirement, however, does not apply to the
extent the services provided by the REIT are usually or customarily rendered in
connection with the rental of space for occupancy only and are not otherwise
considered rendered to the occupant. However, under the DE MINIMIS rule for
noncustomary services, if the value of the noncustomary service income with
respect to a property, valued at no less than 150% of the REIT's direct costs of
performing such services, is 1% or less of the total income derived from the
property, then all rental income except the noncustomary service income will
qualify as rents from real property.

    We have recently received a favorable ruling from the IRS with respect to
our provision of telecommunication services, including high-speed Internet
access, to our tenants. Under the ruling, providing these services to a property
will not disqualify rents received from the property. In addition, amounts that
we receive for providing these services will constitute rents from real
property.

    ASSET TESTS.  In order to maintain qualification as a REIT, we must also
satisfy, at the close of each quarter of our taxable year, the following tests
relating to the nature of our assets:

    - at least 75% of the value of our total assets must be represented by real
      estate assets, including (a) our allocable share of real estate assets
      held by the operating partnership or any partnerships in which the
      operating partnership owns an interest and (b) stock or debt instruments
      held for not more than one year purchased with the proceeds of a stock
      offering or long-term (I.E., at least five-year) public debt offering of
      SL Green, cash, cash items and government securities;

    - no more than 20% of the value of our total assets may be securities of one
      or more Taxable REIT Subsidiaries; and

    - except for securities in the 75% asset class, securities in a Taxable REIT
      Subsidiary or qualified REIT subsidiary, and certain partnership interests
      and debt obligations;

                                       24

    - the value of any one issuer's securities owned by SL Green may not exceed
      5% of the value of our total assets;

    - we may not own more than 10% of the total voting power of any one issuer's
      outstanding securities; and

    - we may not own more than 10% of the total value of any one issuer's
      outstanding securities.

    A "Taxable REIT Subsidiary" is a corporation that may earn income that would
not be qualifying income if we earned it directly and may hold assets that would
not be qualifying assets if we held them directly. We may hold up to 100% of the
stock in a Taxable REIT Subsidiary. To treat a subsidiary as a Taxable REIT
Subsidiary, we and the subsidiary must make a joint election by filing a Form
8875 with the IRS. A Taxable REIT Subsidiary will be liable for tax at corporate
rates on any income it earns. Moreover, to prevent shifting of income and
expenses between us a Taxable REIT Subsidiary, the Code imposes on us a tax
equal to 100% of certain items of income and expense that are not allocated
between us and the Taxable REIT Subsidiary at arm's length.

    After initially meeting an asset test at the close of any quarter, we will
not lose our status as a REIT for failure to satisfy that asset test at the end
of a later quarter solely by reason of changes in asset values. If the failure
to satisfy the asset test results from an acquisition of securities or other
property during a quarter, the failure can be cured by disposition of sufficient
nonqualifying assets within 30 days after the close of that quarter.

    ANNUAL DISTRIBUTION REQUIREMENTS.  In order to qualify as a REIT, we are
required to distribute dividends, other than capital gain dividends, to our
stockholders in an amount at least equal to (a) the sum of (A) 90% of our REIT
taxable income (computed without regard to the dividends paid deduction and the
REIT's net capital gain) and (B) 90% of the net income, after tax, if any, from
foreclosure property, minus (b) the sum of specific items of non-cash income. We
must pay the distribution during the taxable year to which the distributions
relate, or during the following taxable year, if declared before we timely file
our tax return for the preceding year and paid on or before the first regular
dividend payment after the declaration. In addition, a dividend declared and
payable to a stockholder of record in October, November or December of any year
may be treated as paid and received on December 31 of such year even if paid in
January of the following year. To the extent that we do not distribute all of
our net capital gain or distribute at least 90%, but less than 100%, of our REIT
ordinary taxable income, we will be subject to tax on the undistributed amount
at regular corporate capital gain and ordinary income rates, respectively.
Furthermore, if we fail to distribute during each calendar year at least the sum
of (a) 85% of our REIT ordinary income for such year, (b) 95% of our REIT
capital gain income for such year and (c) any undistributed taxable income from
prior periods, we will be subject to a 4% excise tax on the excess of such
amounts over the amounts actually distributed.

    We intend to make timely distributions sufficient to satisfy the annual
distribution requirements. In this regard, it is expected that our REIT taxable
income will be less than our cash flow due to the allowance of depreciation and
other non-cash charges in computing REIT taxable income. Moreover, the
partnership agreement of the operating partnership authorizes us, as general
partner, to take such steps as may be necessary to cause the operating
partnership to make distributions to its partners in amounts sufficient to
permit us to meet these distribution requirements. It is possible, however, that
we may not have sufficient cash or other liquid assets to meet the 90%
distribution requirement. In the event that such circumstances do occur, then in
order to meet the 90% distribution requirement, we may cause the operating
partnership to arrange for short-term, or possibly long-term, borrowings to
permit the payment of required distributions.

    Under specific circumstances, we may rectify a failure to meet the
distribution requirement for a year by paying deficiency dividends to
stockholders in a later year that may be included in our

                                       25

deduction for dividends paid for the earlier year. Thus, we may be able to avoid
being taxed on amounts distributed as deficiency dividends. However, we would be
required to pay to the IRS interest based upon the amount of any deduction taken
for deficiency dividends.

    FAILURE TO QUALIFY

    If we fail to qualify for taxation as a REIT in any taxable year and other
relief provisions do not apply, we will be subject to tax, including any
applicable alternative minimum tax, on our taxable income at regular corporate
rates. Distributions to stockholders in any year in which we fail to qualify as
a REIT will not be deductible by us, nor will we be required to make
distributions. Unless entitled to relief under specific statutory provisions, we
also will be disqualified from taxation as a REIT for the four taxable years
following the year during which qualification was lost. It is not possible to
state whether in all circumstances we would be entitled to such statutory
relief.

TAXATION OF STOCKHOLDERS

    The discussion does not address all of the tax consequences that may be
relevant to particular stockholders in light of their particular circumstances.
Stockholders should consult their own tax adviser for a complete description of
the tax consequences of investing in the offered stock.

    U.S. STOCKHOLDERS

    As used herein, the term U.S. Stockholder means a stockholder who is a U.S.
Person. A U.S. Person is defined as a citizen or resident of the United States,
a corporation or partnership (including an entity treated as a corporation or
partnership for United States federal income tax purposes) created or organized
in or under the laws of the United States, any State of the United States or the
District of Columbia (other than a partnership that is not treated as a U.S.
Person under any applicable Treasury regulations) or an estate whose income is
subject to United States federal income tax regardless of its source, or a trust
if a court within the United States is able to exercise primary supervision over
the administration of the trust and one or more U.S. Persons have the authority
to control all substantial decisions of the trust. Notwithstanding the preceding
sentence, to the extent provided in Treasury regulations, specific trusts in
existence on August 20, 1996, and treated as U.S. Persons prior to such date,
that elect to continue to be treated as U.S. Persons, also will be U.S. Persons.

    DISTRIBUTIONS.  As long as we qualify as a REIT, distributions made to our
taxable U.S. Stockholders out of current or accumulated earnings and profits and
not designated as capital gain dividends will be taken into account by them as
ordinary income. Corporate stockholders will not be eligible for the dividends
received deduction as to such amounts. Distributions that are designated as
capital gain dividends will be taxed as capital gains to the extent they do not
exceed our actual net capital gain for the taxable year without regard to the
period for which the stockholder has held our stock. If we elect to retain and
pay income tax on any net capital gain, U.S. Stockholders would include in their
income as capital gain their proportionate share of such net capital gain. A
U.S. Stockholder would also receive the right to claim a refundable tax credit
for such stockholder's proportionate share of the tax paid by SL Green on such
retained capital gains and an increase in its basis in the stock of SL Green.
This increase in basis will be in an amount equal to the excess of the
undistributed capital gains over the amount of tax paid thereon by SL Green.
Distributions in excess of current and accumulated earnings and profits will not
be taxable to a stockholder to the extent that they do not exceed the adjusted
basis of the stock, but rather will reduce the adjusted basis of the stock. To
the extent that such distributions exceed a stockholder's adjusted basis in the
stock, such distribution will be included in income as capital gain, assuming
the stock is a capital asset in the hands of the stockholder.

                                       26

    Any dividend declared by us in October, November or December of any year
payable to a stockholder of record on a specific date in any such month shall be
treated as both paid by us and received by the stockholder on December 31 of
such year, provided the dividend is actually paid by us during January of the
following calendar year.

    SALE OR EXCHANGE.  In general, a U.S. Stockholder realizes capital gain or
loss on the sale or exchange of the stock equal to the difference between (a)
the amount of cash and the fair market value of any property received on such
disposition, and (b) the stockholder's adjusted basis in the stock. To the
extent a U.S. Stockholder who is an individual, a trust or an estate holds the
stock for at least one year, any gain realized would be subject to a maximum
rate of 20%.

    BACKUP WITHHOLDING.  We will report to our U.S. Stockholders and the IRS the
amount of dividends paid during each calendar year and the amount of tax
withheld, if any, with respect thereto. Under the backup withholding rules, a
stockholder may be subject to backup withholding with respect to dividends paid
unless the holder (a) is a corporation or comes within other exempt categories
and, when required, demonstrates this fact, or (b) provides a taxpayer
identification number and certifies as to no loss of exemption, and otherwise
complies with the applicable requirements of the backup withholding rules. In
addition, we may be required to withhold a portion of capital gain distributions
made to any stockholders who fail to certify their non-foreign status to us.

    An individual who is a U.S. Stockholder may satisfy the requirements by
providing us with an appropriately prepared IRS Form W-9. If a U.S. Stockholder
does not provide us with their correct taxpayer identification number, then the
U.S. Stockholder may also be subject to penalties imposed by the IRS.

    Backup withholding tax is not an additional tax. Any amounts withheld under
the backup withholding tax rules will be refunded or credited against the U.S.
Stockholders federal income tax liability, provided the U.S. Stockholder
furnishes the required information to the IRS.

    TAXATION OF TAX-EXEMPT STOCKHOLDERS

    The IRS has ruled that amounts distributed as dividends by a qualified REIT
generally do not constitute unrelated business taxable income ("UBTI") when
received by a tax-exempt entity. Based on that ruling, the dividend income will
not be UBTI to a tax-exempt stockholder, provided that the tax-exempt
stockholder has not held stock as debt financed property within the meaning of
the Code and such stock is not otherwise used in a trade or business unrelated
to the tax-exempt stockholder's exempt purpose. Similarly, income from the sale
of the stock will not constitute UBTI unless such tax-exempt stockholder has
held such stock as debt financed property within the meaning of the Code or has
used the shares in a trade or business.

    Notwithstanding the above paragraph, if we are a pension-held REIT, then any
qualified pension trust that holds more than 10% of our stock will have to treat
dividends as UBTI in the same proportion that our gross income would be UBTI. A
qualified pension trust is any trust described in Section 401(a) of the Code
that is exempt from tax under Section 501(a). In general, we will be treated as
a pension-held REIT if both (a) we are predominantly owned by qualified pension
trusts and (b) we would not be a REIT if we had to treat our stock held by
qualified pension trust as owned by the qualified pension trust (instead of
treating such stock as owned by the qualified pension trust's multiple
beneficiaries). Although we do not anticipate being classified as a pension-held
REIT, we cannot assume that this will always be the case.

    In addition, if you are a tax-exempt stockholder described in Section
512(a)(3) of the Code, then distributions received from us may also constitute
UBTI. You are described in Section 512(a)(3) if you qualify for exemption under
Sections 501(c)(7), (9), (17), or (20).

                                       27

    TAXATION OF NON-U.S. STOCKHOLDERS

    The rules governing U.S. federal income taxation of nonresident alien
individuals, foreign corporations, foreign partnerships and other foreign
stockholders, which are referred to collectively as Non-U.S. Stockholders are
complex and no attempt will be made herein to provide more than a limited
summary of such rules. Non-U.S. Stockholders should consult with their own tax
advisors to determine the impact of U.S. Federal, state and local income tax
laws with regard to an investment in the stock, including any reporting
requirements.

    ORDINARY DIVIDENDS.  Distributions, other than distributions that are
treated as attributable to gain from sales or exchanges by us of U.S. real
property interests and other than distributions designated by us as capital gain
dividends, will be treated as ordinary income to the extent that they are made
out of our current or accumulated earnings and profits. Such distributions to
Non-U.S. Stockholders will ordinarily be subject to a withholding tax equal to
30% of the gross amount of the distribution, unless an applicable tax treaty
reduces that tax rate. However, if income from the investment in the shares of
the stock is treated as effectively connected with the Non-U.S. Stockholder's
conduct of a U.S. trade or business, the Non-U.S. Stockholder generally will be
subject to a tax at graduated rates in the same manner as U.S. stockholders are
taxed with respect to such dividends and may also be subject to the 30% branch
profits tax if the stockholder is a foreign corporation.

    Pursuant to the Final Regulations generally effective for payments made on
or after January 1, 2001, dividends paid to an address in a country outside the
United States are no longer presumed to be paid to a resident of such country
for purposes of determining the applicability of withholding discussed above and
the applicability of a tax treaty rate. A Non-U.S. Stockholder who wishes to
claim the benefit of an applicable treaty rate may need to satisfy certification
and other requirements, such as providing IRS Form W-8BEN. A Non-U.S.
Stockholder who wishes to claim distributions are effectively connected with a
United States trade or business, may need to satisfy certification and other
requirements, such as providing IRS Form W-8ECI. Other requirements may apply to
Non-U.S. Stockholders that hold their shares through a financial intermediary or
foreign partnership.

    RETURN OF CAPITAL.  Distributions in excess of our current and accumulated
earnings and profits, which are not treated as attributable to the gain from the
disposition by us of a U.S. real property interest, will not be taxable to a
Non-U.S. Stockholder to the extent that they do not exceed the adjusted basis of
the stock, but rather will reduce the adjusted basis of such stock. To the
extent that such distributions exceed the adjusted basis of the stock, they will
give rise to tax liability if the Non-U.S. Stockholder otherwise would be
subject to tax on any gain from the sale or disposition of its stock, as
described below. If it cannot be determined at the time a distribution is made
whether such distribution will be in excess of current and accumulated earnings
and profits, the distribution will be subject to withholding at the rate
applicable to dividends. However, the Non-U.S. Stockholder may seek a refund of
such amounts from the IRS to the extent it is subsequently determined that such
distribution was, in fact, in excess of our current and accumulated earnings and
profits.

    CAPITAL GAIN DIVIDENDS.  For any year in which we qualify as a REIT,
distributions that are attributable to gain from sales or exchanges by us of
U.S. real property interests will be taxed to a Non-U.S. Stockholder under the
provisions of the Foreign Investment in Real Property Tax Act of 1980, as
amended ("FIRPTA"). Under FIRPTA, these distributions are taxed to a Non-U.S.
Stockholder as if such gain were effectively connected with a U.S. business.
Thus, Non-U.S. Stockholders will be taxed on such distributions at the same
capital gain rates applicable to U.S. stockholders, subject to any applicable
alternative minimum tax and special alternative minimum tax (in the case of
nonresident alien individuals), without regard to whether such distributions are
designated by us as capital gain dividends. Also, distributions subject to
FIRPTA may be subject to a 30% branch profits tax in the hands of a corporate
Non-U.S. Stockholder not entitled to treaty relief or exemption.

                                       28

We are required by applicable Treasury Regulations under FIRPTA to withhold 35%
of any distribution that could be designated by us as a capital gain dividend.

    SALE OR EXCHANGE OF STOCK.  Gain recognized by a Non-U.S. Stockholder upon a
sale or exchange of stock, including a redemption that is treated as a sale,
generally will not be taxed under FIRPTA if we are a domestically controlled
REIT. A REIT is a "domestically controlled REIT" if at all times during a
specified testing period less than 50% in value of its stock is held directly or
indirectly by non-U.S. persons. However, gain not subject to FIRPTA will be
taxable to a Non-U.S. Stockholder if (a) investment in the stock is treated as
effectively connected with the Non-U.S. Stockholder's U.S. trade or business, in
which case the Non-U.S. Stockholder will be subject to the same treatment as
U.S. stockholders with respect to such gain, or (b) the Non-U.S. Stockholder is
a nonresident alien individual who was present in the United States for 183 days
or more during the taxable year and has a tax home in the United States, or
maintains an office or fixed place of business in the United States to which the
gain is attributable, in which case the nonresident alien individual will be
subject to a 30% tax on the individual's capital gains. A similar rule will
apply to capital gain dividends not subject to FIRPTA.

    Although we anticipate that we will qualify as a domestically controlled
REIT, we cannot assume that we will continue to so qualify. If we were not a
domestically controlled REIT, whether or not a Non-U.S. Stockholder's sale of
stock would be subject to tax under FIRPTA would depend on whether or not the
stock was regularly traded on an established securities market and on the size
of the selling Non-U.S. Stockholder's interest in us. If the gain on the sale of
the stock were to be subject to tax under FIRPTA, the Non-U.S. Stockholder would
be subject to the same treatment as U.S. Stockholders with respect to such gain,
subject to any applicable alternative minimum tax and a special alternative
minimum tax (in the case of nonresident alien individuals) and the purchaser of
such stock may be required to withhold 10% of the gross purchase price.

OTHER TAX CONSIDERATIONS

    EFFECT OF TAX STATUS OF OPERATING PARTNERSHIP AND OTHER ENTITIES ON REIT
QUALIFICATION. All of our significant investments are held through the operating
partnership. The operating partnership may hold interests in properties through
property-owning entities. The operating partnership and the property-owning
entities, as well as SL Green Management LLC, involve special tax
considerations. These tax considerations include:

    - allocations of income and expense items of the operating partnership and
      the property-owning entities, which could affect the computation of
      taxable income of SL Green;

    - the status of the operating partnership, the property-owning entities and
      SL Green Management LLC as partnerships or entities that are disregarded
      as entities separate from their owners as, opposed to associations taxable
      as corporations, for income tax purposes, and

    - the taking of actions by the operating partnership or any of the
      property-owning entities that could adversely affect our qualification as
      a REIT.

    In the opinion of Sidley Austin Brown & Wood LLP, based on the factual
representations by SL Green and the operating partnership, as set forth in the
first paragraph of this section, for federal income tax purposes, the operating
partnership will be treated as a partnership and neither SL Green Management LLC
nor any of the property-owning entities will be treated as an association
taxable as a corporation (other than a corporation qualified to make a REIT
election). If, however, the operating partnership or any of such other entities
were treated as an association taxable as a corporation, we would fail to
qualify as a REIT for a number of reasons.

    The partnership agreement requires that the operating partnership be
operated in a manner that will enable us to satisfy the requirements for
classification as a REIT. In this regard, we will control the

                                       29

operation of the operating partnership through its rights as the sole general
partner of the operating partnership.

    TAX ALLOCATIONS WITH RESPECT TO THE PROPERTIES.  When property is
contributed to a partnership in exchange for an interest in the partnership, the
partnership generally takes a carryover basis in that property for tax purposes.
Therefore, the partnership's basis is equal to the adjusted basis of the
contributing partner in the property, rather than a basis equal to the fair
market value of the property at the time of contribution. Pursuant to Section
704(c) of the Code, income, gain, loss and deductions attributable to such
contributed property must be allocated in a manner such that the contributing
partner is charged with, or benefits from, respectively, the unrealized gain or
unrealized loss associated with the property at the time of the contribution.
The amount of unrealized gain or unrealized loss is generally equal to the
difference between the fair market value of the contributed property at the time
of contribution and the adjusted tax basis of such property at the time of
contribution, which we refer to as a "Book-Tax Difference". Such allocations are
solely for federal income tax purposes and do not affect the book capital
accounts or other economic or legal arrangements among the partners. The
operating partnership was funded by way of contributions of appreciated property
to the operating partnership in the transactions leading to its formation.
Consequently, the partnership agreement will require these allocations to be
made in a manner consistent with Section 704(c) of the Code and the regulations
thereunder, which we refer to as the "Section 704(c) Regulations".

    The Section 704(c) Regulations require partnerships to use a "reasonable
method" for allocation of items affected by Section 704(c) of the Code and they
outline three methods which may be considered reasonable for these purposes. The
operating partnership intends to use the "traditional method" of Section 704(c)
allocations, which is the least favorable method from our perspective because of
technical limitations. Under the traditional method, depreciation with respect
to a contributed property for which there is a Book-Tax Difference first will be
allocated to SL Green and other partners who did not have an interest in the
property until they have been allocated an amount of depreciation equal to what
they would have been allocated if the operating partnership had purchased such
property for its fair market value at the time of contribution. In addition, if
this property is sold, gain equal to the Book-Tax Difference at the time of sale
will be specially allocated to the contributor of the property. These
allocations will tend to eliminate the Book-Tax Differences with respect to the
contributed properties over the depreciable lives of the contributed property.
However, they may not always entirely eliminate the Book-Tax Difference on an
annual basis or with respect to a specific taxable transaction such as a sale.
This could cause us (a) to be allocated lower depreciation deductions for tax
purposes than would be allocated to us if all properties were to have a tax
basis equal to their fair market value at the time of contribution and (b) to be
allocated lower amounts of taxable loss in the event of a sale of such
contributed interests in the properties at a book loss, than the economic or
book loss allocated to us as a result of such sale, with a corresponding benefit
to the other partners in the operating partnership. These allocations might
adversely affect our ability to comply with REIT distribution requirements,
although we do not anticipate that this will occur. These allocations may also
affect our earnings and profits for purposes of determining the portion of
distributions taxable as a dividend income. The application of these rules over
time may result in a higher portion of distributions being taxed as dividends
than would have occurred had we purchased our interests in the Properties at
their agreed values.

    Interests in the properties purchased by the operating partnership for cash
simultaneously with or subsequent to our admission to the operating partnership
initially will have a tax basis equal to their fair market value. Thus, Section
704(c) of the Code will not apply to such interests.

FEDERAL ESTATE TAXES

    In general, if an individual who is not a citizen or resident (as defined in
the Code) of the United States owns (or is treated as owning) our stock at the
date of death, such stock will be included in the

                                       30

individual's estate for United States federal estate tax purposes, unless an
applicable estate tax treaty provides otherwise.

STATE AND LOCAL TAX

    SL Green and our stockholders may be subject to state and local tax in
states and localities in which it does business or owns property. Our tax
treatment and the tax treatment of the stockholders in such jurisdictions may
differ from the federal income tax treatment described above.

                              PLAN OF DISTRIBUTION

    SL Green may sell the securities to one or more underwriters for public
offering and sale by them or may sell the securities to investors directly or
through agents. Any underwriter or agent involved in the offer and sale of the
securities will be named in the applicable prospectus supplement.

    Underwriters may offer and sell the securities at a fixed price or prices,
which may be changed related to the prevailing market prices at the time of sale
or at negotiated prices. SL Green also may, from time to time, authorize
underwriters acting as their agents to offer and sell the securities upon the
terms and conditions as are set forth in the applicable prospectus supplement.
In connection with the sale of securities, underwriters may be deemed to have
received compensation from SL Green in the form of underwriting discounts or
commissions and may also receive commissions from purchasers of securities for
whom they may act as agent. Underwriters may sell securities to or through
dealers, and the dealers may receive compensation in the form of discounts,
concessions or commissions from the underwriters and/or commissions from the
purchasers for whom they may act as agent.

    Any underwriting compensation paid by SL Green to underwriters or agents in
connection with the offering of securities, and any discounts, concessions for
commissions allowed by underwriters to participating dealers, will be set forth
in the applicable prospectus supplement. Underwriters, dealers and agents
participating in the distribution of the securities may be deemed to be
underwriters, and any discounts and commissions received by them and any profit
realized by them on resale of the securities may be deemed to be underwriting
discounts and commissions, under the Securities Act of 1933, as amended.
Underwriters, dealers and agents may be entitled, under agreements entered into
with SL Green and the operating partnership, to indemnification against and
contribution toward civil liabilities, including liabilities under the
Securities Act of 1933, as amended.

    The underwriters and their affiliates may be customers of, engage in
transactions with and perform services for SL Green and the operating
partnership and its subsidiaries in the ordinary course of business.

                                 LEGAL MATTERS

    The validity of the issuance of the securities offered hereby and the legal
matters described under "Material Federal Income Tax Consequences" will be
passed upon for SL Green by Sidley Austin Brown & Wood LLP, New York, New York.

                                    EXPERTS

    Ernst & Young LLP, independent auditors, have audited our consolidated
financial statements and schedule included in our Annual Report on Form 10-K for
the three years ended December 31, 2000, and the statement of revenues and
certain expenses for One Park Avenue included in our Current Report on Form
8-K/A dated January 10, 2001, for the year ended December 31, 2000 and the
statement of revenues and certain expenses for 317 Madison Avenue included in
our current report on Form 8-K/A, dated June 7, 2001, for the year ended
December 31, 2000, as set forth in their reports, which are incorporated by
reference in this prospectus and elsewhere in the registration statement. Our
financial statements and schedule are incorporated by reference in reliance on
Ernst & Young LLP's reports, given on their authority as experts in accounting
and auditing.

                                       31

                      WHERE YOU CAN FIND MORE INFORMATION

    We file annual, quarterly and current reports, proxy statements and other
information with the Securities and Exchange Commission. You may read and copy
any reports, statements or other information we file at the SEC's public
reference rooms located at Judiciary Plaza, 450 Fifth Street, N.W., Washington,
D.C. 20549, Citicorp Center, 500 West Madison Street, Suite 1400, Chicago, IL
60661 and 7 World Trade Center, Suite 1300, New York, NY 10048. Please call the
SEC at 1-800-SEC-0330 for further information on the public reference rooms. Our
SEC filings are also available to the public from commercial document retrieval
services and at the web site maintained by the SEC at "http://www.sec.gov."

    We have filed a registration statement on Form S-3, of which this prospectus
forms a part, to register the securities with the SEC. As allowed by SEC rules,
this prospectus does not contain all the information you can find in the
registration statement or the exhibits to the registration statement.

    The SEC allows us to "incorporate by reference" information into this
prospectus, which means that we can disclose important information to you by
referring you to another document filed separately with the SEC. The information
incorporated by reference is deemed to be part of this prospectus, except for
any information superseded by information in this prospectus. This prospectus
incorporates by reference the documents set forth below that we have previously
filed with the SEC. These documents contain important information about us, our
business and our finances.



DOCUMENT                                                                  PERIOD
--------                                                    -----------------------------------
                                                                         
Annual Report on Form 10-K (File No. 1-13199).............         Year ended December 31, 2000

Quarterly Report on Form 10-Q (File No. 1-13199)..........         Quarter ended March 31, 2001




                                                                 DATED              FILED
                                                            ----------------   ----------------
                                                                         
Current Reports on Form 8-K (File No. 1-13199)............  January 10, 2001   January 25, 2001
                                                            February 7, 2001   February 8, 2001
                                                            February 8, 2001   February 8, 2001
                                                                May 29, 2001       June 6, 2001
                                                                June 7, 2001      June 18, 2001




                                                                 DATED              FILED
                                                            ----------------   ----------------
                                                                         
Amendments to Current Reports on Form 8-K (File
  No. 1-13199)............................................  January 10, 2001     March 26, 2001
                                                            January 10, 2001     March 27, 2001
                                                            January 10, 2001     March 29, 2001
                                                                June 7, 2001      July 13, 2001




                                                                 DATED              FILED
                                                            ----------------   ----------------
                                                                         
Definitive Proxy Statement on Schedule 14A (File
  No. 1-13199)............................................    March 30, 2001     March 30, 2001


    Any documents which we file pursuant to Sections 13(a), 13(c), 14 or 15(d)
of the Exchange Act after the date of this prospectus but before the end of any
offering of securities made under this prospectus will also be considered to be
incorporated by reference.

    If you request, either orally or in writing, we will provide you with a copy
of any or all documents which are incorporated by reference. Such documents will
be provided to you free of charge, but will not contain any exhibits, unless
those exhibits are incorporated by reference into the document. Requests should
be addressed to Andrew S. Levine, Esq., SL Green Realty Corp., 420 Lexington
Avenue, New York, NY 10170, telephone number (212) 594-2700.

                                       32

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                                5,000,000 SHARES

                            [SL GREEN REALTY CORP.]

                                  COMMON STOCK

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                    P R O S P E C T U S  S U P P L E M E N T

                                 JULY 19, 2001

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                              SALOMON SMITH BARNEY

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