SL GREEN REALTY CORP
S-3/A, 2000-01-12
OPERATORS OF NONRESIDENTIAL BUILDINGS
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    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 12, 2000


                                       REGISTRATION STATEMENT NO. 333-68493
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                           --------------------------


                                AMENDMENT NO. 4


                                       TO

                                    FORM S-3

                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------

                             SL GREEN REALTY CORP.

             (Exact name of registrant as specified in its charter)

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<S>                                                      <C>
                       MARYLAND                                                13-3956775
   (State or other jurisdiction of incorporation or              (I.R.S. employer identification number)
                     organization)
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                           --------------------------

                              420 LEXINGTON AVENUE
                            NEW YORK, NEW YORK 10170
                                 (212) 594-2700
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)


                              70 WEST 36TH STREET
                            NEW YORK, NEW YORK 10018
                         (FORMER ADDRESS OF REGISTRANT)

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

                                STEPHEN L. GREEN
                      CHAIRMAN AND CHIEF EXECUTIVE OFFICER
                              420 LEXINGTON AVENUE
                            NEW YORK, NEW YORK 10170
                                 (212) 594-2700
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
                           --------------------------

                                    COPY TO:


                            MICHAEL F. TAYLOR, ESQ.
                                BROWN & WOOD LLP
                       ONE WORLD TRADE CENTER, 58TH FLOOR
                              NEW YORK, N.Y. 10048
                                 (212) 839-8602

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

    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE OF PUBLIC: From time to
time after this Registration Statement becomes effective. If the only securities
being registered on this form are being offered pursuant to dividend or interest
reinvestment plans, please check the following box. / /

    If any of the securities being registered on this form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, as amended, other than securities offered only in connection with dividend
or interest reinvestment plans, please check the following box. /X/

    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act of 1933, please check the
following box and list the Securities Act of 1933 registration statement number
of the earlier effective registration statement for the same offering. / /

    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act of 1933, check the following box and list the
Securities Act of 1933 registration statement number of the earlier effective
registration statement for the same offering. / /

    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. /X/

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

    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON THE DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE WITH SECTION 8(a) OF THE SECURITIES
ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME EFFECTIVE ON THE
DATE THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a), MAY DETERMINE.

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- --------------------------------------------------------------------------------
<PAGE>
THE INFORMATION CONTAINED IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED.
WE MAY NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER
TO SELL THESE SECURITIES AND IT IS NOT SOLICITING AN OFFER TO BUY THESE
SECURITIES IN ANY STATE WHERE THE OFFER OR SALE IS NOT PERMITTED.
<PAGE>

                             SUBJECT TO COMPLETION



                 PRELIMINARY PROSPECTUS DATED JANUARY 12, 2000


PROSPECTUS

                                  $400,000,000

                                     [LOGO]

                        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 29 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 2 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.


January 12, 2000

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                               TABLE OF CONTENTS

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                                                                PAGE
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INFORMATION ABOUT SL GREEN..................................      2

RISK FACTORS................................................      2

FORWARD-LOOKING STATEMENTS MAY PROVE INACCURATE.............      9

USE OF PROCEEDS.............................................     10

RATIOS OF EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED
  STOCK DIVIDENDS...........................................     10

DESCRIPTION OF COMMON STOCK.................................     11

DESCRIPTION OF PREFERRED STOCK..............................     12

RESTRICTIONS ON OWNERSHIP OF CAPITAL STOCK..................     18

MATERIAL FEDERAL INCOME TAX CONSIDERATIONS..................     20

PLAN OF DISTRIBUTION........................................     29

LEGAL MATTERS...............................................     30

EXPERTS.....................................................     30

WHERE YOU CAN FIND MORE INFORMATION.........................     30
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                           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 Class B 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 September 30, 1999, we
owned 90.9% of the outstanding partnership interests in the operating
partnership.


    The term "Class B" is generally used in the Manhattan office market to
describe office properties which 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. Class B 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.

    Several areas of Manhattan are dominated by Class B office space and contain
no or very limited Class A office space. Examples of these areas include the
Garment District, the Flatiron District, the areas immediately south and north
of Houston Street, Chelsea, and the area surrounding the United Nations. Various
industries are significantly concentrated in these areas, including the
following industries: new media, garment, toy, jewelry, interior decoration,
antiques, giftware, contract furnishing and United Nations-related businesses.

    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 2003, leases will expire on approximately 40% of the rentable square
feet at our properties. As of September 30, 1999, approximately 2.5 million
square feet are scheduled to expire by December 31, 2003 and these leases
currently have annualized escalated rental income totaling $63.6 million. 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 OPERATION.  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.
These


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properties are 673 First Avenue, 420 Lexington Avenue, 711 Third Avenue, and
1140 Avenue of the Americas. Unless we can purchase a fee interest in the
underlying land or extend the terms of these leases before their expiration, we
will lose our right to operate these properties and our interest in the
improvements upon expiration of the leases. The average term of these long term
leases, including our unilateral extension rights on two of the properties, is
49 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 September 30, 1999 totaled $69.8 million or 38.1% of
SL Green's total annualized revenue.



    RELIANCE ON MAJOR TENANTS COULD ADVERSELY AFFECT OUR RESULTS OF
OPERATION.  Giving effect to signed leases in effect as of September 30, 1999
for properties owned as of September 30, 1999, five tenants each accounted for
more than 1.43% of our total annualized rental revenues and collectively
accounted for approximately 9.97% of our total annualized rental revenues. 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 CLASS B 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 OPERATION.
The total principal amount of our combined outstanding indebtedness was
$422.4 million as of September 30, 1999, $61.0 million of which is borrowings
under our credit facility and $293.3 million of which is non-recourse mortgage
loans on 15 of our properties and $68.1 million which is SL Green's portion of
indebtedness on three joint venture 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
facility. The credit facility matures on December 18, 2000, which date may be
extended by an additional year, subject to the consent of the lenders.



    If we are unable to make payments under our credit facility, all amounts due
and owing at such time shall accrue interest at a rate equal to 4% higher than
the rate at which each such loan was made. Based on a 100 basis point move in
the interest rates underlying our credit facility, SL Green's annual interest
expense would increase $0.6 million. 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 our existing indebtedness, which in
virtually all cases requires substantial principal payments at maturity. In June
2000, $52.75 million of debt on one of our buildings will have matured and in
November 2000, $44 million of debt on another of our buildings will have
matured. At present time we intend to refinance the debt associated with both
properties on or prior to their respective maturity dates. If any principal
payments due at maturity cannot be refinanced,

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extended or paid with proceeds of other capital transactions, 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 credit facility contains restrictions and requirements on our
method of operations. The credit facility also has requirements that designate
total debt to assets ratios, debt service coverage ratios and minimum ratios of
unencumbered assets to unsecured debt are maintained. Restrictions in our
ability to conduct our 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 credit facility and property-level mortgage debt will bear interest at a
variable rate. Borrowings under our credit facility bear interest at a rate
equal to the London Interbank Offered Rate plus 140 basis points. As of
September 30, 1999 borrowings under the facility bear interest at 6.74%.
Additionally, advances under property-level mortgage debt ($201.3 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 September 30, 1999, a
hypothetical 100 basis point increase in interest rates along the entire rate
curve would have adversely affected SL Green's annual interest cost by
approximately $2.4 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 September 30, 1999, assuming the conversion
of all outstanding units of the operating partnership into shares of our common
stock, our debt to market capitalization ratio was approximately 37.6%. However,
our policy is to incur debt only if upon this incurrence our debt to market
capitalization would be 50% 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 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, 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 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 a mortgage interest in three
properties with an aggregate book value of $40.9 million. To the extent we
invest in mortgage loans, such mortgage loans may or may not be recourse


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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 may co-invest with third parties through partnerships, joint
ventures or co-tenancies, 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. SL Green is
currently participating in two unconsolidated joint ventures for two properties
and has an aggregate cost basis in the joint ventures totaling $22.5 million.


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.  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; and

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

    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 2000, 2001 and 2002,
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, directly or indirectly, by five or fewer
individuals at any time during the last half of any year. 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.

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    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.

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 are members of senior management and
serve as members of the board of directors. 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 debts, 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. 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 unit holders holding at least 75%
of the units issued in consideration for these properties. The current carrying
value of the commercial real estate totaled $76.0 million at September 30, 1999.
We have also agreed not to reduce the mortgage indebtedness ($25.4 million at
September 30, 1999), 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


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470 Park Avenue, 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 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 but one of our office properties at a cost
totalling $2.6 million for the nine months ended September 30, 1999. SL Green
and our tenants account for approximately 29.5% of First Quality Maintenance,
L.P.'s 1998 total revenue and 44.02% of Classic Security LLC's 1998 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.  Mr. Green, David J. Nettina, Nancy A. Peck, Steven H. Klein,
Benjamin P. Feldman, Marc Holliday and Gerard Nocera have 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. With the exception
of Ms. Peck's agreement, for the most part these restrictions apply to each
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.

    OUTSIDE INTERESTS OF OFFICERS AND DIRECTORS COULD CONFLICT WITH OUR
INTERESTS.  As we have previously stated, Messrs. Green and Feldman own
interests in some of our properties through their ownership of units in the
operating partnership. In addition, Mr. Green, Mr. Feldman and Ms. Peck own
direct and indirect interests in office properties and other real estate assets
and these interests may give rise to conflicts of interest concerning the
fulfillment of their responsibilities as officers and, in the case of
Messrs. Green and Feldman, directors of SL Green.

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 sources that are itemized
in the REIT tax laws. We are

                                       7
<PAGE>
also required to distribute to shareholders at least 95% 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 could
jeopardize our REIT status. Furthermore, Congress and 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 affect of the value of our securities.
In addition, we would no longer be required to make any distributions to
shareholders.

THE FINANCIAL CONDITION OF THIRD-PARTY PROPERTY MANAGEMENT, LEASING AND
  CONSTRUCTION BUSINESSES COULD ADVERSELY AFFECT OUR RESULTS OF OPERATION

    In order to maintain and preserve our status as a REIT, we cannot provide
various services, including management, leasing or construction services,
directly to tenants of properties that we do not wholly own. Rather than
providing these services ourselves, we have a subsidiary over which we do not
have voting control, but do have a 95% economic interest, provide such services.
As a result, we do not have the ability to elect or remove any members of the
board of directors of these service corporations, and, therefore, our ability to
influence their day-to-day decisions is limited. We are subject to the risks
associated with the management, leasing and construction businesses that are
conducted by them. These risks include the risk that management and leasing
contracts with third party property owners will not be renewed upon expiration,
will be canceled pursuant to cancellation options or will not be renewed on
terms at least as favorable to us as current terms. Additionally, the rental
revenues upon which management, leasing and construction fees are based could
decline as a result of general real estate market conditions or specific market
factors affecting properties we service, and that leasing and construction
activity generally could decline. Since our initial public offering, 11
management and leasing contracts with third party property owners have been
cancelled, representing an aggregate decrease of approximately $0.9 million in
annual revenue. We do not intend to seek to replace the contracts or to pursue
other third party management and leasing opportunities. Each of these
developments could adversely affect the revenues of the service subsidiaries and
could adversely affect our ability to continue to make expected distributions to
our 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.

                                       8
<PAGE>
                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.


    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.

                                       9
<PAGE>
                                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:


<TABLE>
<CAPTION>

<S>                                <C>          <C>          <C>            <C>          <C>        <C>        <C>
                                           SL GREEN REALTY CORP.                      SL GREEN PREDECESSOR(1)
                                               (CONSOLIDATED)                               (COMBINED)
                                   --------------------------------------   -------------------------------------------
                                    NINE                     AUGUST 21,     JANUARY 1,
                                   MONTHS                    1997 TO
                                    ENDED       YEAR ENDED   DECEMBER 31,   1997 TO
                                   SEPTEMBER                                AUGUST 20,
                                   30, 1999     DECEMBER 31,                                      YEARS ENDED
                                                                                                  DECEMBER 31,
                                                 1998          1997          1997
                                   ----------   ----------   ------------   ----------   ------------------------------
                                                                                           1996       1995       1994
                                                                                         --------   --------   --------
Ratio of Earnings to Combined
  Fixed Charges and Preferred
  Stock Dividends (2)............     1.51         1.63          3.96            (3)         (3)        (3)        (3)
</TABLE>


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

(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 years ended
    December 31, 1996, 1995 and 1994, SL Green Predecessor fixed charge ratios
    were deficits of $100, $3,470, $6,923 and $5,040, 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.

                                       10
<PAGE>
                          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 December 31, 1999, there were
24,203,633 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, 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."

                                       11
<PAGE>
TRANSFER AGENT AND REGISTRAR

    The transfer agent and registrar for the common stock is the American Stock
Transfer & Trust Company.

                         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 December 31, 1999 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;

    - 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;

                                       12
<PAGE>
    - 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 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.

                                       13
<PAGE>
    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
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

                                       14
<PAGE>
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.

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.

                                       15
<PAGE>
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 this 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.

    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

                                       16
<PAGE>
        (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 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 American
Stock Transfer & Trust Company.

                                       17
<PAGE>
                   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. For example, 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 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

                                       18
<PAGE>
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 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.

                                       19
<PAGE>
                    MATERIAL FEDERAL INCOME TAX CONSEQUENCES

    The following discussion summarizes the material Federal income tax
consequences that are generally applicable to all 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
offered securities.

    The information in this section and the opinions of 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. 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.

    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
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 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. 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

                                       20
<PAGE>
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.

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

                                       21
<PAGE>
(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.
SEE "RECENT DEVELOPMENTS" BELOW.

    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 specific 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, interest, or from specific 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 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 the 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.

                                       22
<PAGE>
    - 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 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 three tests relating to the nature of our assets at the close of each
quarter of our taxable year. SEE "RECENT DEVELOPMENTS" BELOW.

    - 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.

    - of the investments not included in the 75% asset class, the value of any
      one issuer's securities owned by SL Green may not exceed 5% of the value
      of our total assets.

    - of the investments not included in the 75% asset class, we may not own
      more than 10% of any one issuer's outstanding voting securities.

    After initially meeting the asset tests at the close of any quarter, we will
not lose our status as a REIT for failure to satisfy the asset tests at the end
of a later quarter solely by reason of changes in asset values. If the failure
to satisfy the asset tests 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) 95% of our REIT
taxable income (computed without regard to the dividends paid deduction and the
REIT's net capital gain) and (B) 95% 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
is 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 95%, but less than 100%, of our REIT
taxable income, as adjusted, we will be subject to tax on the undistributed
amount at regular corporate capital gains rates and ordinary income tax rates.
Furthermore, if we fail to distribute during each calendar year at least the sum
of (a) 85% of our REIT ordinary income of such year, (b) 95% of our

                                       23
<PAGE>
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 95%
distribution requirement. In the event that such circumstances do occur, then in
order to meet the 95% 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 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.


RECENT DEVELOPMENTS



    The Tax Relief Extension Act of 1999 was recently enacted and contains
several tax provisions regarding REITs, including a reduction of the annual
distribution requirement for REIT taxable income from 95% to 90%. This act also
changes the 10% voting securities test under current law to a 10% vote or value
test. Thus, subject to certain exceptions, a REIT will no longer be allowed to
own more than 10% of the vote or value of the outstanding securities of any
issuer, other than a qualified REIT subsidiary or another REIT. One exception to
this new test, which is also an exception to the 5% asset test under current
law, allows a REIT to own any or all of the securities of a "taxable REIT
subsidiary." A taxable REIT subsidiary can perform non-customary services for
tenants of a REIT without disqualifying rents received from such tenants for
purposes of the REIT's gross income tests and can also undertake third-party
management and development activities as well as non-real-estate-related
activities. A taxable REIT subsidiary will be taxed as a regular C corporation
but will be subject to earnings stripping limitations on the deductibility of
interest paid to its REIT. In addition, a REIT will be subject to a 100% excise
tax on certain excess amounts to ensure that (i) tenants who pay a taxable REIT
subsidiary for services are charged an arm's-length amount by the taxable REIT
subsidiary for the service, rather than paying an excessive amount to the REIT
as rent, (ii) shared expenses of a REIT and its taxable REIT subsidiary are
allocated fairly between the two, and (iii) interest paid by a taxable REIT
subsidiary to its REIT is commercially reasonable. Securities of a taxable REIT
subsidiary will constitute non-real-estate assets for purposes of determining
whether at least 75% of a REIT's assets consist of real estate. In addition, no
more than 20% of a REIT's total assets can consist of securities of taxable REIT
subsidiaries.


                                       24
<PAGE>

    These new tax provisions are not effective until January 1, 2001. In
addition, grandfather protection is provided with respect to the 10% value test
for securities of a corporation held by a REIT on July 12, 1999, but such
protection ceases to apply after the corporation engages in a substantial new
line of business or acquires any substantial asset and also ceases to apply
after the acquisition of additional securities of the corporation by the REIT
after July 12, 1999. We have made no decision at this time with regard to any
actions we might take relating to the provisions contained in the Tax Relief
Extension Act. However, because we currently own more than 10% of the value of
our management subsidiary, we may have to restructure the ownership of this
company or have it elect to be a taxable REIT subsidiary of the Company in 2001.


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 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 difference between the
undistributed capital gains and the amount of tax paid 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.

    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, even if the dividend is actually paid by us during January of the
following calendar year.

                                       25
<PAGE>
    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 at the rate of 31% 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.

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. 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.

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 refer 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 is now required to satisfy
specific certification and other requirements.

                                       26
<PAGE>
    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 if 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. 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 domestically controlled REIT is defined generally as a REIT which at all
times during a specified testing period less than 50% in value of the stock was
held directly or indirectly by foreign 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

                                       27
<PAGE>
interests in properties through property-owning entities. The operating
partnership and the property-owning entities, as well as S.L. 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
      S.L. 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 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 S.L. Green Management LLC nor any of the
property-owning entities will be treated as an association taxable as a
corporation. 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 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

                                       28
<PAGE>
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
amounts of depreciation deduction 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.

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 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 me 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, are 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. 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.

    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.

                                       29
<PAGE>
                                 LEGAL MATTERS

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

                                    EXPERTS

    Ernst & Young LLP, independent auditors, have audited our consolidated
financial statements and schedule for the year ended December 31, 1998 and for
the period August 21, 1997, which is the date of commencement of operations to
December 31, 1997, the combined financial statements of the SL Green Predecessor
for the period January 1, 1997 to August 20, 1997 and for the year ended
December 31, 1996 and the combined financial statements of the uncombined joint
ventures of the SL Green Predecessor for the period January 1, 1997 to
August 20, 1997 and for the year ended December 31, 1996 included in our Annual
Report on Form 10-K and the statement of revenues and certain expenses for the
555 West 57(th) Street property for the year ended December 31, 1998, included
in our Current Report on Form 8-K/A dated January 25, 1999 and the statement of
revenues and certain expenses for the Madison Properties for the year ended
December 31, 1998, included in our Current Report on Form 8-K/A dated May 24,
1999 and the statement of revenues and certain expenses for the
90 Broad Street property for the fiscal year ended April 30, 1999, included in
our Current Report on Form 8-K/A dated May 24, 1999, as set forth in their
reports, which are incorporated by reference in this 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.

                      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

                                       30
<PAGE>
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.


<TABLE>
<CAPTION>
DOCUMENT                                                        PERIOD
- --------                                                   ----------------
<S>                                                        <C>                <C>
Annual Report on Form 10-K (File No. 1-13199)............  Year ended December 31, 1998
Quarterly Reports on Form 10-Q (File No. 1-13199)........  Quarter ended March 31, 1999
                                                           Quarter ended June 30, 1999
                                                           Quarter ended September 30, 1999
</TABLE>



<TABLE>
<CAPTION>
                                                                DATED               FILED
                                                           ----------------   -----------------
<S>                                                        <C>                <C>
Current Reports on Form 8-K
  (File No. 1-13199).....................................  January 25, 1999   February 8, 1999
                                                           March 22, 1999     March 23, 1999
                                                           May 24, 1999       June 8, 1999

<CAPTION>
                                                                DATED               FILED
                                                           ----------------   -----------------
<S>                                                        <C>                <C>
Amendments to Current Reports on Form 8-K
  (File No. 1-13199).....................................  January 25, 1999   April 9, 1999
                                                           May 24, 1999       August 6, 1999
</TABLE>


    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. The 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 Benjamin Feldman, Esq., SL Green Realty Corp., 420 Lexington
Avenue, New York, NY 10170, telephone number (212) 594-2700.

                                       31
<PAGE>

                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS



ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION



    The following sets forth the estimated expenses in connection with the
issuance and distribution of our securities being registered hereby, other than
underwriting discounts and commissions, all of which will be borne by SL Green:



<TABLE>
<S>                                                           <C>
Securities and Exchange Commission registration fee.........  $111,200.00
Printing and engraving expenses.............................    10,000.00
NASD fees...................................................    30,500.00
Legal fees and expenses.....................................    50,000.00
Accounting fees and expenses................................    25,000.00
Blue Sky fees and expenses..................................     5,000.00
Miscellaneous...............................................    15,000.00
                                                              -----------
  Total.....................................................  $246,700.00
                                                              ===========
</TABLE>



ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS.



    The Maryland General Corporation Law, as amended from time to time, permits
a Maryland corporation to include in its charter a provision limiting the
liability of its directors and officers to the corporation and its shareholders
for money damages except for liability resulting from (a) actual receipt of an
improper benefit or profit in money, property or services, or (b) active and
deliberate dishonesty established by a final judgment as being material to the
cause of action. The articles of incorporation contain a provision which
eliminates the liability to the maximum extent permitted by Maryland law.



    The articles of incorporation authorize SL Green, to the maximum extent
permitted by Maryland law, to obligate itself to indemnify and to pay or
reimburse reasonable expenses in advance of final disposition of a proceeding to
(a) any present or former director or officer or (b) any individual who, while a
director of SL Green and at the request of SL Green, serves or has served
another corporation, partnership, joint venture, trust, employee benefit plan or
any other enterprise as a director, officer, partner or trustee of the
corporation, partnership, joint venture, trust, employee benefit plan or other
enterprise. The bylaws of SL Green obligate it, to the maximum extent permitted
by Maryland law, to indemnify and to pay or reimburse reasonable expenses in
advance of final disposition of a proceeding to (a) any present or former
director or officer who is made a party to the proceeding by reason of his
service in that capacity or (b) any individual who, while a director of SL Green
and at the request of SL Green, serves or has served another corporation,
partnership, joint venture, trust, employee benefit plan or any other enterprise
as a director, officer, partner or trustee of the corporation, partnership,
joint venture, trust, employee benefit plan or other enterprise and who is made
a party to the proceeding by reason of his service in that capacity. The
articles of incorporation and bylaws also permit SL Green to indemnify and
advance expenses to any person who served a predecessor of SL Green in any of
the capacities described above and to any employee or agent of SL Green or a
predecessor of SL Green.



    The Maryland General Corporation Law requires a corporation to indemnify a
director or officer who has been successful, on the merits or otherwise, in the
defense of any proceeding to which he is made a party by reason of his service
in that capacity. The Maryland General Corporation Law permits a corporation to
indemnify its present and former directors and officers, among others, against
judgments, penalties, fines, settlements and reasonable expenses actually
incurred by them in connection with any proceeding to which they may be made a
party by reason of their service in those or other capacities unless it is
established that (a) the act or omission of the director or officer was


                                      II-1
<PAGE>

material to the matter giving rise to the proceeding and (1) was committed in
bad faith or (2) was the result of active and deliberate dishonesty, (b) the
director or officer actually received an improper personal benefit in money,
property or services or (c) in the case of any criminal proceeding, the director
or officer had reasonable cause to believe that the act or omission was
unlawful. However, a Maryland corporation may not indemnify for an adverse
judgment in a suit by or in the right of the corporation. In addition, the
Maryland General Corporation Law requires SL Green, as a condition to advancing
expenses, to obtain (a) a written affirmation by the director or officer of his
good faith belief that he has met the standard of conduct necessary for
indemnification by SL Green as authorized by the bylaws and (b) a written
statement by or on his behalf to repay the amount paid or reimbursed by SL Green
if it shall ultimately be determined that the standard of conduct was not met.



    SL Green has entered into indemnification agreements with each of its
executive officers and directors. The indemnification agreements require, among
other matters, that SL Green indemnify its executive officers and directors to
the fullest extent permitted by law and advance to the executive officers and
directors all related expenses, subject to reimbursement if it is subsequently
determined that indemnification is not permitted. Under these agreements, SL
Green must also indemnify and advance all expenses incurred by executive
officers and directors seeking to enforce their rights under the indemnification
agreements and may cover executive officers and directors under SL Green's
directors' and officers' liability insurance. Although indemnification
agreements offer substantially the same scope of coverage afforded the bylaws,
they provide greater assurance to directors and executive officers that
indemnification will be available, because, as contracts, they cannot be
modified unilaterally in the future by the board of directors or the
shareholders to eliminate the rights they provide.



ITEM 16. EXHIBITS.



<TABLE>
<C>   <S>
 1.1  --Form of Underwriting Agreement.(1)
 4.1  --Form of Designating Amendment for Preferred Stock.(1)
 5.1  --Opinion of Brown & Wood LLP as to the legality of the
      securities.(2)
 8.1  --Opinion of Brown & Wood LLP as to tax matters.(2)
12.1  --Calculation of Ratios of Earnings to Combined Fixed
      Charges and Preferred Dividends.
23.1  --Consent of Brown & Wood LLP (included in Exhibit 5.1).(2)
23.2  --Consent of Ernst & Young LLP.
24.1  --Power of attorney (included on signature page of this
      registration statement) (2).
</TABLE>


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


(1) To be filed by amendment or incorporated by reference in connection with the
    offering of securities.



(2) Previously filed.



ITEM 17. UNDERTAKINGS.



    (a) The undersigned Registrant hereby undertakes:



        (1) To file, during any period in which offers or sales are being made,
    a post-effective amendment to the registration statement;



           (A) To include any prospectus required by Section 10(a)(3) of the
       Securities Act of 1933;



           (B) To reflect in the prospectus any facts or events arising after
       the effective date of the registration statement, of the most recent
       post-effective amendment thereof, which, individually or in the
       aggregate, represent a fundamental change in the information set forth in
       the registration statement. Notwithstanding the foregoing, any increase
       or decrease in


                                      II-2
<PAGE>

       volume of securities offered if the total dollar value of securities
       offered would not exceed that which was registered and any deviation from
       the low or high end of the estimated maximum offering range may be
       reflected in the form of prospectus filed with the Commission pursuant to
       Rule 424(b) if, in the aggregate, the changes in volume and price
       represent no more than a 20% change in the maximum offering price set
       forth in the "Calculation of Registration Fee" table in the effective
       registration statement;



           (C) To include any material information with respect to the plan of
       distribution not previously disclosed in the registration statement or
       any material change to the information in the registration statement.



       Provided, however, that paragraphs (1)(A) and (1)(B) do not apply if the
       information required to be included in a post-effective amendment by
       those paragraphs is contained in periodic reports filed by the Registrant
       pursuant to Section 13 or 15(d) of the Exchange Act that are incorporated
       by reference in the registration statement.



        (2) That, for the purpose of determining any liability under the
    Securities Act of 1933, each of these post-effective amendments shall be
    deemed to be a new registration statement relating to the securities offered
    therein, and the offering of the securities at that time shall be deemed to
    be the initial bona fide offering thereof.



        (3) To remove from registration by means of a post-effective amendment
    any of the securities being registered which remain unsold at the
    termination of the offering.



    (b) The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
Registrant's annual report pursuant to Section 13(a) or 15(d) of the Exchange
Act, and, where applicable, each filing of an employee benefit plan's annual
report pursuant to Section 15(d) of the Exchange Act, that is incorporated by
reference in the registration statement shall be deemed to be a new registration
statement relating to the securities offered therein, and the offering of the
securities at that time shall be deemed to be the initial bona fide offering
thereof.



    (c) Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors, officers and controlling persons of
the Registrant pursuant to the foregoing provisions, or otherwise, the
Registrant has been advised that in the opinion of the Securities and Exchange
Commission the indemnification is against public policy as expressed in the
Securities Act of 1933 and is, therefore, unenforceable. In the event that a
claim for indemnification against these liabilities, other than the payment by
the Registrant of expenses incurred or paid by a director, officer or
controlling person of the Registrant in the successful defense of any action,
suit or proceeding, is asserted by the director, officer or controlling person
in connection with the securities being registered, the Registrant will, unless
in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
the indemnification by it is against public policy as expressed in the
Securities Act of 1933 and will be governed by the final adjudication of this
issue.



    (d) The undersigned Registrant hereby undertakes that:



        (1) For purposes of determining any liability under the Securities Act
    of 1933, the information omitted from the form of prospectus filed as part
    of this registration statement in reliance upon Rule 430A and contained in a
    form of prospectus filed by the Registrant pursuant to Rule 424(b)(1) or
    (4) under the Securities Act of of 1933 shall be deemed to be part of this
    registration statement as of the time it was declared effective.



        (2) For the purpose of determining any liability under the Securities
    Act of 1933, each post-effective amendment that contains a form of
    prospectus shall be deemed to be a new registration statement relating to
    the securities offered therein, and the offering of the securities at that
    time shall be deemed to be the initial bona fide offering thereof.


                                      II-3
<PAGE>
                                   SIGNATURES


    Pursuant to the requirements of the Securities Act of 1933, SL Green Realty
Corp. certifies that it has reasonable grounds to believe that it meets all of
the requirements for filing on Form S-3 and has duly caused this registration
statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in New York, on January 12, 2000.


<TABLE>
<S>                                          <C>  <C>
                                             SL GREEN REALTY CORP.

                                             BY:              /S/ THOMAS E. WIRTH
                                                  ------------------------------------------
                                                                Thomas E. Wirth
                                                            CHIEF FINANCIAL OFFICER
</TABLE>

    Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed by the following persons in the
capacities and on the dates indicated.


<TABLE>
<CAPTION>
                      SIGNATURE                                    TITLE                    DATE
                      ---------                                    -----                    ----
<C>                                                    <S>                            <C>

                /s/ STEPHEN L. GREEN*                  Chief Executive Officer and
     -------------------------------------------         Chairman of the Board of     January 12, 2000
                  Stephen L. Green*                      Directors

                /s/ DAVID J. NETTINA*                  President and Chief Operating
     -------------------------------------------         Officer (principal           January 12, 2000
                  David J. Nettina*                      executive officer)

                                                       Executive Vice President and
                 /s/ THOMAS E. WIRTH                     Chief Financial Officer
     -------------------------------------------         (principal financial         January 12, 2000
                   Thomas E. Wirth                       officer and principal
                                                         accounting officer)

               /s/ BENJAMIN P. FELDMAN                 Executive Vice President,
     -------------------------------------------         General Counsel, Secretary   January 12, 2000
                 Benjamin P. Feldman                     and Director

               /s/ JOHN H. ALSCHULER*
     -------------------------------------------       Director                       January 12, 2000
                  John H. Alschuler

            /s/ EDWIN THOMAS BURTON, III*
     -------------------------------------------       Director                       January 12, 2000
              Edwin Thomas Burton, III

                  /s/ JOHN S. LEVY*
     -------------------------------------------       Director                       January 12, 2000
                    John S. Levy
</TABLE>


*   By Power of Attorney

                                      II-4
<PAGE>
                                 EXHIBIT INDEX


<TABLE>
<CAPTION>
EXHIBITS                                                    DESCRIPTION
- --------                                                    -----------
<C>                     <C>         <S>
         1.1               --       Form of Underwriting Agreement.(1)
         4.1               --       Form of Designating Amendment for Preferred Stock.(1)
         5.1               --       Opinion of Brown & Wood LLP as to the legality of the
                                    securities.(2)
         8.1               --       Opinion of Brown & Wood LLP as to tax matters.(2)
        12.1               --       Calculation of Ratios of Earnings to Combined Fixed Charges
                                    and Preferred Stock Dividends.
        23.1               --       Consent of Brown & Wood LLP (included in Exhibit 5.1).(2)
        23.2               --       Consent of Ernst & Young LLP.
        24.1               --       Power of attorney (included on signature page of this
                                    registration statement).(2)
</TABLE>


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

(1) To be filed by amendment or incorporated by reference in connection with the
    offering of securities.

(2) Previously filed.

<PAGE>
                                                                    EXHIBIT 12.1


SL GREEN REALTY CORP.
RATIO OF EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED STOCK DIVIDENDS



<TABLE>
<CAPTION>
                                      SL GREEN REALTY CORP.                            SL GREEN COMPANY PREDECESSOR
                                          (CONSOLIDATED)                                        (COMBINED)
                       ----------------------------------------------------   ----------------------------------------------
                                                                               JANUARY 1,
                           NINE MONTHS        YEAR ENDED    AUGUST 21, 1997       1997
                       ENDED SEPTEMBER 30,   DECEMBER 31,   TO DECEMBER 31,   TO AUGUST 20,      YEARS ENDED DECEMBER 31,
                       -------------------   ------------   ---------------   -------------   ------------------------------
                              1999               1998            1997             1997          1996       1995       1994
                       -------------------   ------------   ---------------   -------------   --------   --------   --------
<S>                    <C>                   <C>            <C>               <C>             <C>        <C>        <C>
EARNINGS

Income (loss) from
  continuing
  operations.........        $24,674           $23,482          $ 6,633          $ (100)      $(3,470)   $(6,923)   $(5,040)
Interest.............         18,658            11,699            1,637           4,874         7,252      7,338      7,639
Portion of rent
  expense
  representative of
  interest...........          7,727             9,903              497             867         1,344      1,323      1,295
Amortization of loan
  costs..............          1,556             1,084              110             143           192        200        266
                             -------           -------          -------          ------       -------    -------    -------
  Total earnings.....        $52,615           $46,168          $ 8,877          $5,784       $ 5,318    $ 1,938    $ 4,160
                             =======           =======          =======          ======       =======    =======    =======

FIXED CHARGES AND
  PREFERRED STOCK
  DIVIDENDS (1)

Interest.............         18,658            11,699          $ 1,637           4,874         7,252      7,338      7,639
Preferred stock
  dividends..........          6,900             5,720          --               --             --         --         --
Interest
  capitalized........       --                  --              --               --             --         --         --
Portion of rent
  expense
  representative of
  interest...........          7,727             9,903              497             867         1,344      1,323      1,295
Amortization of loan
  costs expensed.....          1,556             1,084              110             143           192        200        266
                             -------           -------          -------          ------       -------    -------    -------
  Total Fixed Charges
    and Preferred
    Stock
    Dividends........        $34,841           $28,406          $ 2,244          $5,884       $ 8,788    $ 8,861    $ 9,200
                             =======           =======          =======          ======       =======    =======    =======
Ratio of earnings to
  combined fixed
  charges and
  preferred stock
  dividends..........          1.51x             1.63x            3.96x              (2)           (2)        (2)        (2)
                             -------           -------          -------          ------       -------    -------    -------
</TABLE>


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


(1) Prior to May 18, 1998, no preferred stock had been issued or was
    outstanding.



(2) For the period January 1, 1997 to August 20, 1997 and the years ended
    December 31, 1996, 1995 and 1994, SL Green Predecessor's fixed charge ratios
    were deficits of $100, $3,470, $6,923 and $5,040, respectively.


<PAGE>
                                                                    EXHIBIT 23.2

                        CONSENT OF INDEPENDENT AUDITORS

    We consent to the reference to our firm under the caption "Experts" in
Amendment No. 4 to the Registration Statement Form S-3 and related Prospectus of
SL Green Realty Corp. (the "Company") for the registration of $400,000,000 of
its common and preferred stock and to the incorporation by reference therein of
our reports (i) dated February 10, 1999, except for the last paragraph in Note
16, as to which the date is March 12, 1999, with respect to the consolidated
financial statements and schedule of the Company for the year ended
December 31, 1998 and for the period August 21, 1997 (date of commencement of
operations) to December 31, 1997, (ii) dated February 10, 1998 with respect to
the combined financial statements of SL Green Predecessor for the period
January 1, 1997 to August 20, 1997 and for the year ended December 31, 1996 and
(iii) dated February 10, 1998 with respect to the combined financial statements
of the uncombined joint ventures of SL Green Predecessor for the period
January 1, 1997 to August 20, 1997 and for the year ended December 31, 1996,
included in its Annual Report on Form 10-K of the Company for the year ended
December 31, 1998, filed with the Securities and Exchange Commission. We also
consent to the use of our reports (i) dated March 19, 1999 with respect to the
statement of revenues and certain expenses for the 555 West 57(th) property for
the year ended December 31, 1998, included in its Form 8-K/A, dated January 25,
1999 and filed with the Securities and Exchange Commission on April 9, 1999,
(ii) dated August 3, 1999 with respect to the statement of revenues and certain
expenses for the Madison Properties for the year ended December 31, 1998,
included in its Form 8-K/A, dated May 24, 1999 and filed with the Securities and
Exchange Commission on August 6, 1999, and (iii) dated August 3, 1999 with
respect to the statement of revenues and certain expenses for the 90 Broad
Street property for the fiscal year ended April 30, 1999, included in its Form
8-K/A, dated May 24, 1999 and filed with the Securities and Exchange Commission
on August 6, 1999.

                                          /s/ Ernst & Young LLP

New York, New York
January 10, 2000


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