<PAGE>
                            SCHEDULE 14A INFORMATION
 
                  Proxy Statement Pursuant to Section 14(a) of
            the Securities Exchange Act of 1934 (Amendment No.    )
 
    Filed by the Registrant /X/
    Filed by a party other than the Registrant / /
 
    Check the appropriate box:
    / /  Preliminary Proxy Statement
    / /  Confidential, for Use of the Commission Only (as permitted by Rule
         14a-6(e)(2))
    /X/  Definitive Proxy Statement
    / /  Definitive Additional Materials
    / /  Soliciting Material Pursuant to Section 240.14a-11(c) or Section 
         240.14a-12
 
- --------------------------------------------------------------------------------
                (Name of Registrant as Specified In Its Charter)
 
- --------------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)
 
Payment of Filing Fee (Check the appropriate box):
 
/X/  No fee required

/ /  Fee computed on table below per Exchange Act Rules 14a-6(i)(1) 
     and 0-11

    (1) Title of each class of securities to which transaction applies:

        ------------------------------------------------------------------------
    (2) Aggregate number of securities to which transaction applies:

        ------------------------------------------------------------------------
    (3) Per unit price or other underlying value of transaction computed
        pursuant to Exchange Act Rule 0-11 (set forth the amount on which the
        filing fee is calculated and state how it was determined):

        ------------------------------------------------------------------------
    (4) Proposed maximum aggregate value of transaction:

        ------------------------------------------------------------------------
    (5) Total fee paid:

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

/ / Fee paid previously with preliminary materials.

/ / Check box if any part of the fee is offset as provided by Exchange Act Rule
    0-11(a)(2) and identify the filing for which the offsetting fee was paid
    previously. Identify the previous filing by registration statement number,
    or the Form or Schedule and the date of its filing.

    (1) Amount Previously Paid:

        ------------------------------------------------------------------------
    (2) Form, Schedule or Registration Statement No.:

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    (3) Filing Party:

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    (4) Date Filed:

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


<PAGE>
                             SL GREEN REALTY CORP.
                              420 Lexington Avenue
                            New York, New York 10170
 
                            ------------------------
 

                    NOTICE OF ANNUAL MEETING OF STOCKHOLDERS
                           to be held on May 19, 1999
 
                            ------------------------
 
    NOTICE IS HEREBY GIVEN that the 1999 Annual Meeting of Stockholders (the
"Annual Meeting") of SL Green Realty Corp. (the "Company") will be held on
Wednesday, May 19, 1999 at 10:00 a.m. at 110 East 42nd Street, New York, New
York, for the following purposes:
 
        1.  To elect two Class II directors of the Company to serve until the
    2002 Annual Meeting of Stockholders and until their successors are duly
    elected and qualified;
 
        2.  To ratify the selection of Ernst & Young LLP as the independent
    auditors of the Company for the fiscal year ending December 31, 1999;
 
        3.  To approve the Company's Amended 1997 Stock Option and Incentive
    Plan, as amended; and
 
        4.  To consider and act upon any other matters that may properly be
    brought before the Annual Meeting and at any adjournments or postponements
    thereof.
 
    Any action may be taken on the foregoing matters at the Annual Meeting on
the date specified above, or on any date or dates to which, by original or later
adjournment, the Annual Meeting may be adjourned, or to which the Annual Meeting
may be postponed.
 
    The Board of Directors has fixed the close of business on March 26, 1999 as
the record date for determining the stockholders entitled to notice of and to
vote at the Annual Meeting and at any adjournments or postponements thereof.
Only stockholders of record of the Company's common stock, $.01 par value per
share, at the close of business on that date will be entitled to notice of and
to vote at the Annual Meeting and at any adjournments or postponements thereof.
 
    You are requested to fill in and sign the enclosed form of proxy, which is
being solicited by the Board of Directors, and to mail it promptly in the
enclosed postage-prepaid envelope. Any proxy may be revoked by delivery of a
later dated proxy. Stockholders of record who attend the Annual Meeting may vote
in person, even if they have previously delivered a signed proxy.
 
                                          BY ORDER OF THE BOARD OF DIRECTORS
 
                                                   [LOGO]
 
                                          BENJAMIN P. FELDMAN
                                          SECRETARY
 
New York, New York
M
arch 31, 1999
 
    WHETHER OR NOT YOU PLAN TO ATTEND THE MEETING, PLEASE COMPLETE, SIGN, DATE
AND PROMPTLY RETURN THE ENCLOSED PROXY CARD IN THE POSTAGE-PREPAID ENVELOPE
PROVIDED. IF YOU ATTEND THE ANNUAL MEETING, YOU MAY VOTE IN PERSON IF YOU WISH,
EVEN IF YOU HAVE PREVIOUSLY RETURNED YOUR PROXY CARD.

<PAGE>
                             SL GREEN REALTY CORP.
                              420 Lexington Avenue
                            New York, New York 10170
 
                            ------------------------
 
                                PROXY STATEMENT
 
                            ------------------------
 
                    FOR 1999 ANNUAL MEETING OF STOCKHOLDERS
                           to be held on May 19, 1999
 
                            ------------------------
 
    This Proxy Statement is furnished in connection with the solicitation of
proxies by the Board of Directors of SL Green Realty Corp. (the "Company") for
use at the 1999 Annual Meeting of Stockholders of the Company to be held on
Wednesday, May 19, 1999, and at any adjournments or postponements thereof (the
"Annual Meeting"). At the Annual Meeting, stockholders will be asked to vote
upon (1) the election of two Class II directors of the Company, (2) to ratify
the selection of Ernst & Young LLP as the independent auditors of the Company
for the fiscal year ending December 31, 1999, (3) to approve the Company's
Amended 1997 Stock Option and Incentive Plan, as amended, and (4) to act upon
any other matters properly brought before them.
 
    This Proxy Statement and the accompanying Notice of Annual Meeting and Proxy
Card are first being sent to stockholders on or about March 31, 1999. The Board
of Directors has fixed the close of business on March 26, 1999 as the record
date for the determination of stockholders entitled to notice of and to vote at
the Annual Meeting (the "Record Date"). Only stockholders of record of the
Company's common stock, par value $.01 per share (the "Common Stock"), at the
close of business on the Record Date will be entitled to notice of and to vote
at the Annual Meeting. As of the Record Date, there were 24,191,826 shares of
Common Stock outstanding and entitled to vote at the Annual Meeting. Holders of
Common Stock outstanding as of the close of business on the Record Date will be
entitled to one vote for each share held by them.
 
    The presence, in person or by proxy, of holders of at least a majority of
the total number of outstanding shares of Common Stock entitled to vote is
necessary to constitute a quorum for the transaction of business at the Annual
Meeting. The vote of a plurality of all of the votes cast at a meeting at which
a quorum is present is necessary for the election of the Class II directors. The
affirmative vote of the holders of a majority of the shares of Common Stock cast
at the Annual Meeting at which a quorum is present is required for the
ratification of the Company's auditors, the approval of the Company's Amended
1997 Stock Option and Incentive Plan, as amended, and the approval of any other
matters properly presented at the Annual Meeting for stockholder approval. Under
Maryland law, abstentions do not constitute a vote "for" or "against" a matter
and will be disregarded in determining "votes cast." Broker "non-votes", or
proxies from brokers or nominees indicating that such person has not received
instructions from the beneficial owner or other person entitled to vote such
shares on a particular matter with respect to which the broker or nominee does
not have discretionary voting power, will be treated in the same manner as
abstentions.
 
    STOCKHOLDERS OF THE COMPANY ARE REQUESTED TO COMPLETE, SIGN, DATE AND
PROMPTLY RETURN THE ACCOMPANYING PROXY CARD IN THE ENCLOSED POSTAGE-PREPAID
ENVELOPE. SHARES REPRESENTED BY A PROPERLY EXECUTED PROXY RECEIVED PRIOR TO THE
VOTE AT THE ANNUAL MEETING AND NOT REVOKED WILL BE VOTED AT THE ANNUAL MEETING
AS DIRECTED ON THE PROXY. IF A PROPERLY EXECUTED PROXY IS SUBMITTED AND NO
INSTRUCTIONS ARE GIVEN, THE PROXY WILL BE VOTED FOR THE ELECTION OF EACH OF THE
TWO NOMINEES FOR CLASS II DIRECTORS OF THE COMPANY NAMED IN THIS PROXY
STATEMENT, FOR RATIFICATION OF THE BOARD OF DIRECTORS' SELECTION OF ERNST &
YOUNG LLP AS THE COMPANY'S INDEPENDENT AUDITORS FOR THE FISCAL YEAR ENDING
DECEMBER 31, 1999 AND FOR THE APPROVAL OF THE COMPANY'S AMENDED 1997 STOCK
OPTION AND INCENTIVE PLAN, AS AMENDED. IT IS NOT ANTICIPATED THAT ANY MATTERS
OTHER THAN THOSE SET FORTH IN THE PROXY STATEMENT WILL BE PRESENTED AT THE
ANNUAL MEETING. IF OTHER MATTERS ARE PRESENTED, PROXIES WILL BE VOTED IN
ACCORDANCE WITH THE DISCRETION OF THE PROXY HOLDERS.

<PAGE>
    A stockholder of record may revoke a proxy at any time before it has been
exercised by filing a written revocation with the Secretary of the Company at
the address of the Company set forth above, by filing a duly executed proxy
bearing a later date, or by appearing in person and voting by ballot at the
Annual Meeting. Any stockholder of record as of the Record Date attending the
Annual Meeting may vote in person whether or not a proxy has been previously
given, but the presence (without further action) of a stockholder at the Annual
Meeting will not constitute revocation of a previously given proxy.
 
    The Company's 1998 Annual Report, including financial statements for the
fiscal year ended December 31, 1998, has been mailed to stockholders
concurrently with the mailing of this Proxy Statement. The Annual Report,
however, is not part of the proxy solicitation material.
 

                       PROPOSAL 1: ELECTION OF DIRECTORS
 
    The Board of Directors of the Company consists of five members and is
divided into three classes, with the directors in each class serving for a term
of three years and until their successors are duly elected and qualified. The
term of one class expires at each annual meeting of stockholders.
 
    At the Annual Meeting, two directors will be elected to serve until the 2002
Annual Meeting and until their successors are duly elected and qualified. The
Board of Directors has nominated Mr. Benjamin P. Feldman and Mr. John S. Levy to
serve as the Class II directors (the "Nominees"). The Nominees are currently
serving as Class II directors of the Company. The Board of Directors anticipates
each Nominee will serve, if elected, as a director. However, if either person
nominated by the Board of Directors is unable to accept election, the proxies
will be voted for the election of such other person or persons as the Board of
Directors may recommend.
 
 
   THE BOARD OF DIRECTORS RECOMMENDS A VOTE FOR EACH NOMINEE.
 
INFORMATION REGARDING THE NOMINEES AND DIRECTORS
 
    The following table and biographical descriptions set forth certain
information with respect to each Nominee for election as a Class II director at
the Annual Meeting, the continuing directors whose terms expire at the annual
meetings of stockholders in 2000 and 2001 and the executive officers who are not
directors, based upon information furnished to the Company by each director and
executive officer.
 

<TABLE>
<CAPTION>
                                                                                      AMOUNT AND NATURE
                                                                                        OF BENEFICIAL
                                                                          DIRECTOR       OWNERSHIP OF        PERCENT
NAME                                                            AGE         SINCE      COMMON STOCK(1)     OF CLASS(2)
- ----------------------------------------------------------      ---      -----------  ------------------  -------------
<S>                                                         <C>          <C>          <C>                 <C>
CLASS II NOMINEES FOR ELECTION AT 2002 ANNUAL MEETING
  (TERM TO EXPIRE IN 2002)
Benjamin P. Feldman.......................................          46         1997           164,498(3)(4)         0.7%
John S. Levy..............................................          62         1997             2,000             -(5)
CLASS I CONTINUING DIRECTORS
  (TERM EXPIRES IN 2001)
Edwin Thomas Burton, III..................................          56         1997             2,000             -(5)
CLASS III CONTINUING DIRECTORS
  (TERM EXPIRES IN 2000)
John H. Alschuler, Jr.....................................          50         1997             2,000             -(5)
Stephen L. Green..........................................          60         1997         2,140,784(6)          8.1%
</TABLE>

 
- ------------------------
 
(1) All information has been determined as of March 26, 1999. For purposes of
    this table a person is deemed to have "beneficial ownership" of the number
    of shares of Common Stock that such person has the right to acquire pursuant
    to the exercise of stock options exercisable within sixty days or the
    redemption of units (the "Units") of limited partnership interests in SL
    Green Operating Partnership, L.P., a Delaware limited partnership (the
    "Operating Partnership") (assuming the Company elects to issue Common Stock
    rather than pay cash upon such redemption). See "Executive Compensation" for
    a discussion of the vesting of stock options granted to directors and
    officers. Pursuant to the terms of the First Amended and Restated Agreement
    of Limited Partnership of the Operating Partnership,
 
                                       2

<PAGE>
    dated as of August 20, 1997, after August 20, 1999 the Operating Partnership
    is obligated to redeem Units for cash, or, at the option of the Company,
    shares of Common Stock.
 
(2) For purposes of computing the percentage of outstanding shares of Common
    Stock held by each person, any share of Common Stock which such person has
    the right to acquire pursuant to the exercise of a stock option exercisable
    within 60 days is deemed to be outstanding, but is not deemed to be
    outstanding for the purpose of computing the percent ownership of any other
    person.
 
(3) All such shares are held by Mr. Feldman through a family limited liability
    company of which he is the managing member.
 
(4) Includes 30,000 shares of restricted stock which will vest over a period of
    five years provided that the Company meets certain financial performance
    goals.
 
(5) Represents less than 1% of class.
 
(6) Includes 2,140,784 Units.
 
CLASS II NOMINEES FOR ELECTION AT 1999 ANNUAL MEETING--TERM TO EXPIRE IN 2002
 
    BENJAMIN P. FELDMAN has served as Executive Vice President and General
Counsel of the Company and as a Director and member of the Executive Committee
of the Company since 1997. He served as General Counsel of SL Green Properties,
Inc. ("SL Green Properties") from 1987 until 1997. Mr. Feldman handles the legal
aspects of all leasing, financing and acquisition decisions. Prior to joining
the Company, Mr. Feldman was vice-president and general counsel for Bruce Berger
Realty. Mr. Feldman received a B.A. degree from Columbia University and a J.D.
degree from Columbia University School of Law.
 
    JOHN S. LEVY has served as a director of the Company since 1997 and serves
on the Audit Committee and Compensation Committee. He is a private investor. Mr.
Levy was associated with Lehman Brothers Inc. (or its corporate predecessors)
from 1983 until 1995. During this period, Mr. Levy served as Managing Director
and Chief Administrative Officer of the Financial Services Division, Senior
Executive Vice President and Co-Director of the International Division
overseeing the International Branch System, and Managing Partner of the Equity
Securities Division, where he managed the International, Institutional, Retail
and Research Departments. Prior to that period, Mr. Levy was associated with
A.G. Becker Incorporated (or its corporate predecessors) from 1960 until 1983.
During this period, Mr. Levy served as Managing Director of the Execution
Services Division, Vice President-Manager of Institutional and Retail Sales,
Manager of the Institutional Sales Division, Manager of the New York Retail
Office and a Registered Representative. Mr. Levy received a B.A. degree from
Dartmouth College.
 
CLASS I CONTINUING DIRECTOR--TERM TO EXPIRE IN 2001
 
    EDWIN THOMAS BURTON, III has served as a director of the Company since 1997
and serves as Chairman of the Audit Committee, and is a member of the
Compensation Committee. He has been Chairman of the Board of Trustees and a
member of the Investment Advisory Committee of the Virginia Retirement System
("VRS") for state and local employees of the Commonwealth of Virginia ($30
billion in assets). Mr. Burton served as the Chairman of the VRS Special
Committee on the sale of RF&P Corporation, a $570 million real estate company.
He is currently a visiting professor of commerce and economics at the University
of Virginia. From 1994 until 1995, Mr. Burton served as Senior Vice President,
Managing Director and member of the Board of Directors of Interstate Johnson
Lane, Incorporated, an investment banking firm where he was responsible for the
Corporate Finance and Public Finance Divisions. From 1987 to 1994, Mr. Burton
served as President of Rothschild Financial Services, Incorporated (a subsidiary
of Rothschild, Inc. of North America), an investment banking company
headquartered in New York City that is involved in proprietary trading,
securities lending and other investment activities. From 1985 until 1987, Mr.
Burton was a partner of First Capital Strategists, a partnership that managed
security lending and investment activities for large endowment portfolios. Mr.
Burton also served as a consultant to the American Stock Exchange from 1985
until 1986 and a senior vice president with Smith Barney (or its corporate
predecessor) from 1976 until 1984. Mr. Burton currently serves on the Board of
Directors of Capstar, a publicly traded hotel company and SNL Securities, a
private securities data company. He has
 
                                       3

<PAGE>
held various teaching positions at York College, Rice University and Cornell
University and has written and lectured extensively in the field of economics.
Mr. Burton also serves as a member of the Children's Medical Center Committee of
the University of Virginia Hospital Advisory Board. Mr. Burton received a B.A.
and an M.A. in economics from Rice University and a Ph.D. in economics from
Northwestern University.
 
CLASS III CONTINUING DIRECTORS--TERM TO EXPIRE IN 2000
 
    JOHN H. ALSCHULER, JR. has served as a director of the Company since 1997
and serves on the Audit Committee, Executive Committee and Compensation
Committee. He has served as President and Partner in Charge of the New York
office of Hamilton, Rabinowitz & Alschuler, Inc. ("HRA"), a nationally
recognized real estate and management consulting firm, since 1996 and 1983,
respectively. Mr. Alschuler has also been an Adjunct Assistant Professor in the
Graduate Program in Real Estate at Columbia University since 1987. As President
of HRA, Mr. Alschuler is currently advising the Government of Kuwait on the
redevelopment of the main commercial district of Kuwait City. Mr. Alschuler is
also advising the Governor of Massachusetts and the Board of the MBTA on the
restructuring and privatization of the nation's second largest mass transit
system. Mr. Alschuler also serves as the real estate advisor to the Guggenheim
family and their foundation. Mr. Alschuler has advised a wide range of
development clients, including Olympia & York, Maguire Thomas Partners, Queens
West Development Corporation and the Empire State Development Corporation. Mr.
Alschuler has also advised many public organizations and elected officials,
including the Mayor of New York City and the Governor of New York. Mr. Alschuler
received a B.A. degree from Wesleyan University and Ed.D. degree from the
University of Massachusetts at Amherst.
 
    STEPHEN L. GREEN has served as the Chairman and member of the Executive
Committee of the Board of Directors and Chief Executive Officer of the Company
since 1997. Mr. Green founded S.L. Green Real Estate in 1980. Since then he has
been involved in the acquisition of over 30 Manhattan office buildings
containing in excess of four million square feet and the management of 50
Manhattan office buildings containing in excess of 10 million square feet. His
clients have included Aldrich Eastman & Waltch, Bank of New York, CalPERS,
Dai-Ichi Kangyo Bank, and CS First Boston. Mr. Green is a Governor of the Real
Estate Board of New York and an at-large member of the Executive Committee of
the Board of Governors of the Real Estate Board of New York. Additionally, Mr.
Green is a Co-Chairman of the Real Estate Tax Fairness Coalition. Mr. Green
received a B.A. degree from Hartwick College and a J.D. degree from Boston
College Law School. Mr. Green is the husband of Nancy A. Peck, an Executive Vice
President of the Company.
 
EXECUTIVE OFFICERS WHO ARE NOT DIRECTORS
 
    DAVID J. NETTINA has served as President since 1998 and Chief Operating
Officer of the Company since 1997. Prior to joining the Company, Mr. Nettina
worked for The Pyramid Companies ("Pyramid"), based in Syracuse, NY, in various
positions from March 1986 to June 1997. From 1990 to 1997, Mr. Nettina was a
partner and Chief Financial Officer of Pyramid. From 1989 to 1990, Mr. Nettina
was a development partner at the Boston, MA office of Pyramid. Mr. Nettina was
the Director of Corporate Finance of the Pyramid Development Group from 1987 to
1989. From 1986 to 1987, Mr. Nettina was Chief Operating Officer of the Pyramid
Management Group. Mr. Nettina served as President of Citibank (Maine), N.A. from
1983 to 1986. From 1980 to 1983, Mr. Nettina was Assistant Vice President of
Citibank (NYS), N.A. in Rochester, NY. Mr. Nettina was in the U.S. Army from
1976 until he completed service as a Captain in 1980. Mr. Nettina received a
B.S. degree in 1974 and an MBA in 1976 from Canisius College. Mr. Nettina is 46
years old.
 
    ANN ISELEY has served as Executive Vice President and Chief Financial
Officer of SL Green since May 1998. Previously, she was Corporate Treasurer of
Massachusetts Mutual Life Insurance Company in Springfield, Massachusetts, with
$140 billion in assets under management, after its merger with Connecticut
Mutual Life Insurance Company in February 1996. Ms. Iseley had been Chief
Financial and Operations
 
                                       4

<PAGE>
Officer at Connecticut Mutual Financial Services in Hartford, Connecticut, which
included the company's investment management, annuities, mutual funds, pension
management, and broker/dealer businesses, since June 1994. She was recruited to
Connecticut Mutual from the Mack Company, a $1 billion private real estate
company in Rochelle Park, New Jersey, where she had been Corporate Controller
since 1993. Prior to Mack, she held various financial and strategic planning
positions at MONY in New York City, Time-Life Books in Alexandria, Virginia, and
COMSAT in Washington, D.C. Ms. Iseley holds an MBA from the Darden School (1982)
at the University of Virginia and an undergraduate degree from Brown University
(1978), and is also a CPA. Ms. Iseley is 42 years old.
 
    MARC HOLLIDAY joined the Company as Chief Investment Officer in July, 1998,
prior to which he was Managing Director and Head of Direct Originations for New
York-based Capital Trust (NYSE:CT). While at Capital Trust, a specialty real
estate finance company, Mr. Holliday was in charge of originating direct
principal investments for the firm, consisting of mezzanine debt, preferred
equity and first mortgage bridge loans. From July, 1997 until the time he
departed, Mr. Holliday was responsible for the origination of approximately $450
million of debt and preferred equity investments, $260 million of which involved
properties located in Manhattan. From January 1991 to June 1997, Mr. Holliday
served in various management positions, including Senior Vice President, at New
York-based Victor Capital Group--a private real estate investment bank
specializing in advisory services, investment management and debt and equity
placements. While there, Mr. Holliday was chiefly responsible for the strategic
management and resolution of over $250 million of debt on behalf of the firm and
its investors. Additionally, he played an integral role in the restructuring and
repositioning of over $3.0 billion of troubled assets for the firm's
institutional clients. Mr. Holliday received a Bachelor of Science degree in
Business and Finance from Lehigh University in 1988, as well as a Master of
Science degree in Real Estate Development from Columbia University in 1990. Mr.
Holliday is 32 years old.
 
    NANCY ANN PECK has served as Executive Vice President-Development and
Operations of the Company since 1997. From 1983 until 1997, Ms. Peck supervised
redevelopment of the SL Green Properties' projects and oversaw the management
and construction of all properties owned and managed by SL Green Properties.
Prior to joining SL Green Properties, Ms. Peck served as project coordinator for
projects valued in excess of $500 million, one of which was the renovation and
conversion of the two million square foot American Furniture Mart in Chicago
into a multi-use complex. Ms. Peck has worked for McKeon Construction Corp.,
Paul Properties and Shelter Rock Holdings Corp. She recently was appointed to
the Board of Directors of the Real Estate Board of New York, Management
Division. Ms. Peck received a B.A. degree from the University of California at
Berkeley and an MBA in finance from New York University Business School. She is
the wife of Stephen L. Green, Chairman of the Board of Directors and President
of the Company. Ms. Peck is 54 years old.
 
    STEVEN H. KLEIN has served as Executive Vice President-Acquisitions of the
Company since 1997. Mr. Klein oversaw the Asset Management division of SL Green
Properties from 1991 until 1997 and led acquisition, sale and investment
analysis decisions. Mr. Klein played a major role in the redevelopment of SL
Green Properties' managed portfolio. Prior to joining SL Green Properties, Mr.
Klein worked at Gallin Realty Company in marketing and leasing. Mr. Klein
received a B.A. degree from the University of Michigan. Mr. Klein is 38 years
old.
 
    GERARD NOCERA has served as Executive Vice President-Leasing of the Company
since 1997. From 1991 to 1997, Mr. Nocera was responsible for the development
and implementation of marketing and leasing programs at SL Green Properties
owned and managed properties. Prior to joining SL Green Properties, Mr. Nocera
worked for The Cohen Brothers as a landlord representative. Mr. Nocera is a
member of the Real Estate Board of New York. Mr. Nocera received a B.A. degree
from Duquesne University. Mr. Nocera is 42 years old.
 
THE BOARD OF DIRECTORS AND ITS COMMITTEES
 
    The Company is managed by a five member Board of Directors, a majority of
whom are independent of the Company's management. The Board of Directors held
six meetings during fiscal year 1998. Each of
 
                                       5

<PAGE>
the directors attended 100% of the total number of meetings of the Board of
Directors during 1998, except for John H. Alschuler, Jr., who attended 83%.
 
    AUDIT COMMITTEE.  The Audit Committee, which consists of John H. Alschuler,
Jr., Edwin Thomas Burton, III and John S. Levy, makes recommendations concerning
the engagement of independent public accountants, reviews with the independent
public accountants the plans and results of the audit engagements, approves
professional services provided by the independent public accountants, reviews
the independence of the independent public accountants, considers the range of
audit and non-audit fees and reviews the adequacy of the Company's internal
accounting controls. The Audit Committee held four meetings during fiscal year
1998. Each of the committee members attended 100% of the total meetings of the
Audit Committee.
 
    EXECUTIVE COMMITTEE.  Subject to the supervision and oversight of the Board
of Directors, the Executive Committee, which consists of Stephen L. Green,
Benjamin P. Feldman and John H. Alschuler, Jr., has the authority to approve the
acquisition, financing and disposition of investments by the Company and to
authorize the execution of certain contracts and agreements, including those
relating to the borrowing of money by the Company and to exercise generally all
other powers of the Board of Directors, except for those which require action by
all Directors or the Independent Directors under the Articles of Incorporation
or Bylaws of the Company or under applicable law. The Executive Committee held
no meetings during fiscal year 1998.
 
    COMPENSATION COMMITTEE.  The Compensation Committee, which consists of John
H. Alschuler, Jr., Edwin Thomas Burton, III and John S. Levy makes
recommendations and exercises all powers of the Board of Directors in connection
with compensation matters, including incentive compensation and benefit plans.
The Compensation Committee also has authority to grant awards under the
Company's 1997 Stock Option and Incentive Plan, as amended by the Board of
Directors (the "Amended 1997 Stock Option and Incentive Plan"). The Compensation
Committee held one meeting during fiscal year 1998.
 
    The Board of Directors does not have a standing nominating committee. The
full Board of Directors performs the functions of such a committee.
 
DIRECTOR COMPENSATION
 
    Each of the non-employee directors of the Company receives an annual
director's fee of $12,000. Each non-employee director also receives $1,000 for
each meeting of the Board of Directors attended and $500 for each committee
meeting attended, provided such committee meeting does not occur on a day on
which a Board of Directors meeting is held. Each non-employee director, at his
or her option, may elect to receive these amounts in Company Common Stock, in
lieu of cash. Each non-employee director, upon initial election to the Board of
Directors, received options under the 1997 Stock Option and Incentive Plan to
purchase 6,000 shares of Common Stock at the market price of the Common Stock on
the date of grant, which will vest one year from the date of grant.
 

         PROPOSAL 2: RATIFICATION OF SELECTION OF INDEPENDENT AUDITORS
 
    The Board of Directors of the Company, upon the recommendation of the Audit
Committee, has selected the accounting firm of Ernst & Young LLP to serve as
independent auditors of the Company for the fiscal year ending December 31,
1999, subject to ratification of this appointment by the stockholders of the
Company. Ernst & Young LLP has served as the Company's independent auditors
since the Company's formation in June 1997 and is considered by management of
the Company to be well qualified. The Company has been advised by that firm that
neither it nor any member thereof has any financial interest, direct or
indirect, in the Company or any of its subsidiaries in any capacity. A
representative of Ernst & Young LLP will be present at the Annual Meeting, will
be given the opportunity to make a statement if he or she so desires and will be
available to respond to appropriate questions.
 
 
   THE BOARD OF DIRECTORS RECOMMENDS A VOTE FOR THE RATIFICATION OF THE
SELECTION OF THE INDEPENDENT AUDITORS.
 
                                       6

<PAGE>

                             EXECUTIVE COMPENSATION
 
    The following table sets forth information regarding the base compensation
awarded to the Company's Chief Executive Officer and each of the Company's other
seven most highly compensated executive officers of the Company (collectively,
the "Named Executive Officers") whose base salary, on an annualized basis
exceeded $100,000 during the fiscal year ended December 31, 1998.
 
                           SUMMARY COMPENSATION TABLE
 

<TABLE>
<CAPTION>
                                                                              ANNUAL COMPENSATION
                                                         -------------------------------------------------------------
<S>                                                      <C>        <C>           <C>          <C>          <C>
                                                                                                  LONG
                                                                                                  TERM      ALL OTHER
NAME AND PRINCIPAL POSITION                                YEAR      SALARY($)    BONUSES($)   OPTIONS(1)      ($)
- -------------------------------------------------------  ---------  ------------  -----------  -----------  ----------
Stephen L. Green, Chairman of the Board, Chief
  Executive Officer....................................       1998  $    250,000     -0 -         125,000      -0 -
David J. Nettina, President and Chief Operating
  Officer..............................................       1998  $    200,000   $ 100,000      175,000   $  307,000
Steven H. Klein, Executive Vice President-
  Acquisitions.........................................       1998  $    175,000   $  75,000      125,000   $  100,000
Gerard Nocera, Executive Vice President-Leasing........       1998  $    175,000   $  75,000      125,000      -0 -
Nancy A. Peck, Executive Vice President-Development and
  Operations...........................................       1998  $    150,000   $  50,000      100,000      -0 -
Benjamin P. Feldman, Executive Vice President and
  General Counsel......................................       1998  $    150,000   $  50,000      100,000      -0 -
Marc Holliday, Chief Investment Officer................       1998  $    126,923   $  50,000      300,000      -0 -
Ann Iseley, Chief Financial Officer....................       1998  $    100,961   $  50,000       50,000   $   40,055
</TABLE>

 
- ------------------------
 
(1) As of December 31, 1998, options to purchase a total of 1,698,000 shares of
    Common Stock have been granted to directors and employees of the Company,
    including options to purchase 1,100,000 shares of Common Stock granted to
    the Named Executive Officers. Excludes 100,000 options returned to the
    Company by David J. Nettina during 1999.
 
    The following table sets forth the options granted with respect to the
fiscal year ended December 31, 1998 to the Company's Named Executive Officers.
 

<TABLE>
<CAPTION>
                                                                  OPTION GRANTS IN FISCAL YEAR 1998
                                                  ------------------------------------------------------------------
<S>                                  <C>          <C>            <C>         <C>          <C>           <C>
                                                                                             POTENTIAL REALIZABLE
                                                   PERCENT OF                                  VALUE AT ASSUMED
                                                      TOTAL                                    ANNUAL RATES OF
                                      NUMBER OF      OPTIONS      EXERCISE                       SHARE PRICE
                                     SECURITIES    GRANTED TO    PRICE PER                       APPRECIATION
                                     UNDERLYING     EMPLOYEES     SHARE OF                   FOR OPTION TERM (2)
                                       OPTIONS      IN FISCAL      COMMON    EXPIRATION   --------------------------
NAME                                 GRANTED(1)       YEAR        STOCK(3)      DATE         5%(4)         10%(5)
- -----------------------------------  -----------  -------------  ----------  -----------  ------------  ------------
Stephen L. Green...................     125,000          10.4%   $  18.4375    10/05/08   $  1,637,110  $  4,270,855
David J. Nettina...................     100,000           8.3%   $  18.4375    10/05/08      1,309,608     3,416,684
Nancy A. Peck......................      50,000           4.1%   $  18.4375    10/05/08        654,844     1,708,342
Benjamin P. Feldman................      50,000           4.1%   $  18.4375    10/05/08        654,844     1,708,342
Steven H. Klein....................      75,000           6.2%   $  18.4375    10/05/08        982,266     2,562,513
Gerard Nocera......................      75,000           6.2%   $  18.4375    10/05/08        982,266     2,562,513
Marc Holliday......................     300,000          24.9%   $    23.75    07/17/08      5,061,168    13,203,457
Ann Iseley.........................      50,000           4.1%   $    22.50    05/13/08        799,132     2,084,756
</TABLE>

 
- ------------------------
 
(1) All options are granted at the fair market value of the common stock at the
    date of grant. These options will vest in three equal annual installments
    (rounded to the nearest whole share) over three years. Excludes 100,000
    options returned to the Company by David J. Nettina.
 
                                       7

<PAGE>
(2) In accordance with the rules of the Commission, these amounts are the
    hypothetical gains or "option spreads" that would exist for the respective
    options based on assumed rates of annual compound share price appreciation
    of 5% and 10% from the date the options were granted over the full option
    term. No gain to the optionee is possible without an increase in the price
    of the Common Stock, which would benefit all stockholders.
 
(3) The exercise price for the options are was based on the current market price
    of the Common Stock on the date of issuance.
 
(4) An annual compound share price appreciation of 5% from the issuance price of
    the Common Stock yields a weighted-average price of $35.26 per share of
    Common Stock.
 
(5) An annual compound share price appreciation of 10% from the issuance price
    of the Common Stock yields a weighted-average price of $58.82 per share of
    Common Stock.
 
    No options were exercised in 1998. The following table sets forth the value
of options held at the end of 1998 by the Company's Named Executive Officers.
 
                 AGGREGATED FISCAL YEAR-END 1998 OPTION VALUES
 

<TABLE>
<CAPTION>
                                                                    NUMBER OF SHARES             VALUE OF
                                                                       UNDERLYING               UNEXERCISED
                                                                       UNEXERCISED             IN-THE-MONEY
                                                                    OPTIONS AT FISCAL        OPTIONS AT FISCAL
                                                                        YEAR-END              YEAR-END($)(1)
NAME                                                             EXERCISABLE/UNEXERCISABLE EXERCISABLE/UNEXERCISABLE
- ---------------------------------------------------------------  -----------------------  -----------------------
<S>                                                              <C>                      <C>
Stephen L. Green...............................................             0/125,000               $0/$398,438
David J. Nettina...............................................        25,000/150,000          $15,625/$350,000
Nancy A. Peck..................................................         16,666/83,334          $10,416/$180,209
Benjamin P. Feldman............................................         16,666/83,334          $10,416/$180,209
Steven H. Klein................................................        16,666/108,334          $10,416/$259,896
Gerard Nocera..................................................        16,666/108,334          $10,416/$259,896
Marc Holliday..................................................             0/300,000                     $0/$0
Ann Iseley.....................................................              0/50,000                     $0/$0
</TABLE>

 
- ------------------------
 
(1) The value of unexercised in-the-money options at fiscal year-end based on
    the fair market value for Common Stock, $21 5/8 share, as of December 31,
    1998.
 
EMPLOYMENT AND NONCOMPETITION AGREEMENTS
 
    During the fiscal year, Steven H. Klein, Benjamin P. Feldman and Gerard
Nocera each entered into an amended and restated employment and noncompetition
agreements with the Company, effective as of October 1, 1998.
 
    Each amended and restated agreement has a three-year term (which will
automatically renew for additional one-year terms unless notice of non-renewal
is given) and provides for certain severance payments in the event of the Named
Executive Officer's death, disability, termination "without cause" or
resignation with "good reason" (as such terms are defined in the agreements).
Each such employment and noncompetition agreement, subject to certain
exceptions, prohibits the Named Executive Officer from engaging, directly or
indirectly, in any business which engages or attempts to engage, directly or
indirectly, in any material acquisition, development, construction, operation,
management or leasing of any commercial real estate property within specified
portions of the New York City metropolitan area during the one-year period
following the executive's termination of employment with the Company.
 
    In October 1998, David J. Nettina also entered into a generally similar
amended and restated employment and noncompetition agreement with the Company.
However, Mr. Nettina's agreement
 
                                       8

<PAGE>
expires on July 8, 2000 and does not automatically renew. The agreement provides
for a minimum yearly bonus of $100,000, and the award of $200,000 worth of
shares of Common Stock on each of the first, second and third anniversaries of
his employment. The agreement also provides that if Mr. Nettina voluntarily
terminates employment for a reason other than disability or "good reason" and
does not provide at least 12 months advance notice to the Company ("Sufficient
Notice"), certain stock options and shares of restricted stock granted to him
will be forfeited and/or subject to repurchase by the Company. Subject to
certain exceptions, if Mr. Nettina's employment is terminated without Sufficient
Notice, the agreement prohibits Mr. Nettina from engaging in certain competitive
activities within the New York City metropolitan area during the period
beginning on the date of the termination of his employment with the Company and
ending on the later of (i) three years from his commencement of such employment
and (ii) one year from the termination of such employment. Mr. Nettina's is
subject to extension by mutual agreement between Mr. Nettina and the Company.
 
    In addition, pursuant to the terms of Mr. Nettina's employment agreement,
Mr. Nettina received a loan from the Company on August 14, 1997 to purchase
shares of Common Stock issued under the 1997 Stock Option and Incentive Plan (a
"Stock Loan"). The principal amount of the Stock Loan is $300,000. The Stock
Loan has a term of three years, accrues interest at the Federal mid-term
"Applicable Federal Rate" ("AFR"), as in effect from time to time, and is
secured by the Common Stock purchased and is otherwise non-recourse.
One-thirty-sixth of the Stock Loan (together with accrued interest on the Stock
Loan) will be forgiven each month during the term of the Stock Loan provided
that Mr. Nettina is then employed by the Company. In the event of a
change-in-control of the Company, Mr. Nettina's death or permanent disability or
the termination of his employment by the Company without cause, the outstanding
principal amount of the Stock Loan will be forgiven in full. In the event that
Mr. Nettina terminates employment without Sufficient Notice or is terminated
with cause, the outstanding amount of the Stock Loan will be immediately due and
payable. The outstanding amount shall be equal to the amount then due and owing,
pro rated for the number of months elapsed for the year in which termination
occurs. Steven H. Klein received a similar Stock Loan from the Company on August
14, 1997 in the principal amount of $500,000, with a term of five years. One
sixtieth of such Stock Loan will be forgiven each month during the term of the
loan upon the same terms and conditions of Mr. Nettina's Stock Loan.
 
    In July, 1998 Marc Holliday entered into an employment and noncompetition
agreement with the Company. The term of the agreement is five (5) years, which
term does not renew automatically. Pursuant to the agreement, Mr. Holliday
received, among other things, (i) an interest free loan from the Company, due
January 10, 2000, in the amount of $300,000 (which loan shall be forgiven in its
entirety in the event Mr. Holliday remains in the employ of the Company after
January 10, 2000); (ii) options to purchase 300,000 shares of SL Green Common
Stock, which options vest equally over a five year period; and (iii) 150,000
shares of restricted shares of SL Green Common Stock, subject to vesting as
described below (the "Holliday Restricted Stock").
 
    The Holliday Restricted Stock vests over five years, with 15% vesting after
years one, two and three, 20% vesting after year four and the remaining 35%
vesting after year five. However, the vesting of the Holliday Restricted Stock
is further conditioned upon the attainment of specified financial performance
goals during the vesting period. On the fifth anniversary of Mr. Holliday's
employment with SL Green, if Mr. Green is no longer the Chairman of the Board of
Directors of the Company and the total value (such value being the "Total
Value") of Mr. Holliday's stock options, the Holliday Restricted Stock and any
other shares of restricted stock received by Mr. Holliday as compensation is
less than $1,500,000, Mr. Holliday may, at his option, either require SL Green
to pay to him the difference between $1,500,000 and the Total Value or retain
such options and shares. In the event Mr. Holliday requires the Company to pay
such difference, the Company may, at its option, purchase from Mr. Holliday all
such shares and options for a purchase price of $1,500,000.
 
    Finally, in connection with the IPO, Stephen L. Green and Nancy A. Peck each
entered into an employment and noncompetition agreement with the Company that is
substantially similar to the amended
 
                                       9

<PAGE>
and restated employment and noncompetition agreements of Messrs. Klein, Feldman
and Nocera. However, Mr. Green's and Ms. Peck's agreements expire on August 20,
2000 and do not automatically renew, although such agreements may be extended by
mutual agreement between the respective parties to the agreements. In addition,
Ms. Peck's agreement does not prohibit competitive activity following the
termination of her employment with the Company, while Mr. Green's agreement,
subject to certain exceptions, prohibits him from engaging in certain
competitive activities within the New York metropolitan area during the period
beginning on the date of the termination of his employment with the Company and
ending on the later of (i) three years from the closing of the IPO and (ii) one
year from the termination of such employment.
 
R
EPORT ON EXECUTIVE COMPENSATION
 
    The following is a report by the Company's Compensation Committee regarding
the Company's executive compensation objectives, executive compensation program
and the compensation of the Company's chief executive officer.
 
    EXECUTIVE COMPENSATION OBJECTIVES.  The objective of the Company's executive
compensation program is to attract, retain and motivate talented executives that
will maximize stockholder value. In order to achieve this objective, in addition
to annual base salaries, the executive compensation program utilizes a
combination of long-term incentives through equity-based compensation and annual
incentives through cash bonuses. The program is intended to align the interests
of executives with those of the Company's stockholders by linking a portion of
executive compensation directly to increases in stockholder value. The Company
seeks to provide total compensation to its executive officers which is
competitive with total compensation paid by REITs similar to the Company.
 
    PROCEEDINGS OF THE COMPENSATION COMMITTEE.  The Compensation Committee
determines compensation for the Company's executive officers and is comprised of
three nonemployee directors, John H. Alschuler, Jr., Edwin Thomas Burton, III
and John S. Levy. Final compensation determinations for each fiscal year
generally are made after the end of the fiscal year and after audited financial
statements for such year become available. At that time, base salaries for the
following fiscal year are set to the extent not already dictated by the terms of
existing employment agreements, cash bonuses, if any, will be determined for the
past year's performance, and option grants, if any, will generally be made.
 
    The Compensation Committee exercises independent discretion in respect of
executive compensation matters. With respect to the compensation of the Named
Executive Officers other than Mr. Stephen L. Green, the Compensation Committee
reviews the recommendations of Mr. Stephen L. Green.
 
    The following is a discussion of each element of the Company's executive
compensation:
 
    ANNUAL BASE SALARY.  Base salaries for each of the Named Executive Officers,
other than Ann Iseley, are the subject of the employment agreement between the
Company and each such executive as indicated above.
 
    ANNUAL INCENTIVES.  Annual incentives are provided in the form of cash
bonuses to be paid if certain performance objectives are achieved. The
Compensation Committee may in the future award cash bonuses based primarily upon
the Company's level of Funds from Operations. Cash bonuses will also be subject
to adjustment based upon the Compensation Committee's evaluation of an
executive's personal performance. Mr. Nettina's employment and noncompetition
agreement provides for a minimum annual cash bonus (commencing on the first
anniversary of the date of the agreement) of $100,000.
 
    LONG-TERM INCENTIVES.  Long-term incentives are provided through the grant
of stock options. The grant of stock options are intended to align the
executive's long-term objectives with those of the Company's stockholders. The
Amended 1997 Stock Option and Incentive Plan is administered by the
 
                                       10

<PAGE>
Compensation Committee, which has the discretion to determine those individuals
to whom options will be granted, the number of shares subject to options and
other terms and conditions of the options.
 
    1998 CHIEF EXECUTIVE OFFICER COMPENSATION.  As indicated above, Stephen L.
Green's salary was determined prior to the IPO and prior to the formation of the
Compensation Committee. Accordingly, the Compensation Committee took no action
with respect to such determination. As indicated above, the Committee determined
to forgo awards of cash bonuses to executive officers during the Company's first
fiscal year of operations.
 
    TAX DEDUCTIBILITY OF EXECUTIVE COMPENSATION.  Section 162(m) of the Internal
Revenue Code of 1986, as amended, limits the deductibility on the Company's tax
return of compensation over $1 million to any of the named executive officers of
the Company unless, in general, the compensation is paid pursuant to a plan
which is performance-related, non-discretionary and has been approved by the
Company's stockholders. The Compensation Committee's policy with respect to
Section 162(m) is to make every reasonable effort to ensure that compensation is
deductible to the extent permitted while simultaneously providing Company
executives with appropriate compensation for their performance. The Company did
not pay any compensation during 1997 that would be subject to the limitations
set forth in Section 162(m).
 
                                          SUBMITTED BY THE COMPENSATION
                                          COMMITTEE OF THE
                                          BOARD OF DIRECTORS
 
                                          John H. Alschuler, Jr.
                                          Edwin Thomas Burton, III
                                          John S. Levy
 
                                       11

<PAGE>
                            STOCK PERFORMANCE GRAPH
 
    The following graph provides a comparison of the cumulative total
stockholder return on the Common Stock from the IPO price to the NYSE closing
price per share on December 31, 1998 with the cumulative total return on the
Standard & Poor's 500 Composite Stock Price Index (the "S&P 500") and the BBG
REIT Office Properties Index (the "BBG REIT Index"). Total return values were
calculated based on cumulative total return assuming (i) the investment of $100
in the Common Stock IPO on August 15, 1997 and in the S&P 500 and the BBG REIT
Office Properties Index on August 31, 1998 and (ii) reinvestment of dividends.
 
                             TOTAL RETURN BASED ON
 

<TABLE>
<CAPTION>
                                                                                      15-AUG-97    DEC. 97    DEC. 98
                                                                                     -----------  ---------  ---------
<S>                                                                                  <C>          <C>        <C>
SL Green...........................................................................      100.00      105.81      93.62
S&P................................................................................       100.0      108.42      139.4
BBG REIT Office....................................................................       100.0      118.35      96.85
</TABLE>

 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 

<TABLE>
<CAPTION>
              SL GREEN       S&P       BBG REIT OFFICE
<S>         <C>           <C>        <C>
15-Aug-97         100.00     100.00               100.00
DEC. 97           105.81     108.42               118.35
DEC. 98            93.62     139.40                96.85
</TABLE>

 
                               SOURCE: BLOOMBERG
 
- ------------------------
 
(1) Assumes an initial investment of $100 on August 15, 1997 (the IPO purchase
    date) with respect to shares of the Company's Common Stock and on August 31,
    1997 with respect to the S&P 500 and the BBG REIT Index
 

PRINCIPAL AND MANAGEMENT STOCKHOLDERS
 
    The following table sets forth the beneficial ownership of Common Stock for
(i) each stockholder of the Company holding more than a 5% beneficial interest
in the Company, (ii) each executive officer of the Company who is not a director
of the Company and (iii) the directors and executive officers of the
 
                                       12

<PAGE>
Company as a group as of March 26, 1999. Stock ownership of the Directors of the
Company appears under the heading "Information Regarding the Nominee and
Directors" in this Proxy Statement.
 

<TABLE>
<CAPTION>
 
                                                                                         SHARES OF COMMON STOCK
                                                                                          BENEFICIALLY OWNED (1)
                                                                                       -----------------------------
NAME OF BENEFICIAL OWNERS                                                                NUMBER    PERCENT OF TOTAL
- -------------------------------------------------------------------------------------  ----------  -----------------
<S>                                                                                    <C>         <C>
David J. Nettina(2)..................................................................      48,800            0.2%
Nancy A. Peck(2).....................................................................     214,386            0.9%
Steven H. Klein(2)...................................................................     119,563            0.5%
Gerard Nocera(2).....................................................................      95,764            0.4%
Marc Holliday (2)....................................................................     300,000            1.2%
Ann Iseley (2).......................................................................      16,665            0.1%
Cohen & Steers Capital Management, Inc.(3)...........................................   3,220,100           13.3%
Capital Growth Management Limited Partnership(4).....................................   1,785,000            7.4%
AMVESCAP PLC(7)......................................................................   1,344,355            5.6%
EII Realty Securities Inc.(6)........................................................   1,278,700            5.3%
The Equitable Companies Incorporated(5)..............................................   1,269,500            5.2%
All directors and executive officers as a group (11 persons)(8)......................   3,106,450           11.8%
</TABLE>

 
- ------------------------
 
(1) The number of Common Shares beneficially owned is reported on the basis of
    regulations of the SEC governing the determination of beneficial ownership
    of securities. Assumes 26,191,826 shares of Common Stock outstanding.
    Assumes that all Units held by the person (and no other person) are redeemed
    for shares of Common Stock. The total number of shares of Common Stock
    outstanding used in calculating this percentage assumes that none of the
    Units held by other persons are redeemed for shares of Common Stock.
 
(2) The business address for this stockholder is 420 Lexington Avenue, New York,
    New York 10170.
 
(3) The business address for this stockholder is 757 Third Avenue, New York, New
    York 10017. Pursuant to a Schedule 13G filed with the SEC, as of December
    31, 1998, this stockholder may have direct or indirect voting and/or
    investment discretion over these shares of Common Stock which are held for
    the benefit of its clients by its separate accounts, externally managed
    accounts, registered investment companies, subsidiaries and/or other
    affiliates. This stockholder is reporting the combined holdings of the
    entities for the purpose of administrative convenience.
 
(4) The business address for this stockholder is One International Plaza,
    Boston, MA 02110. Pursuant to a Schedule 13G filed with the SEC, as of
    December 31, 1998, this stockholder may have direct or indirect voting
    and/or investment discretion over these shares of Common Stock which are
    held for the benefit of its clients by its separate accounts, externally
    managed accounts, registered investment companies, subsidiaries and/or other
    affiliates. This stockholder is reporting the combined holdings of the
    entities for the purpose of administrative convenience.
 
(5) The business address for this stockholder is 1290 Avenue of the Americas,
    New York, NY 10104. Pursuant to a Schedule 13G filed with the SEC, as of
    December 31, 1998, this stockholder may have direct or indirect voting
    and/or investment discretion over these shares of Common Stock which are
    held for the benefit of its clients by its separate accounts, externally
    managed accounts, registered investment companies, subsidiaries and/or other
    affiliates. This stockholder is reporting the combined holdings of the
    entities for the purpose of administrative convenience.
 
(6) The business address for this stockholder is 667 Madison Avenue, New York,
    NY 10021. Pursuant to a Schedule 13G filed with the SEC, as of December 31,
    1998, this stockholder may have direct or indirect voting and/or investment
    discretion over these shares of Common Stock which are held for the benefit
    of its clients by its separate accounts, externally managed accounts,
    registered investment
 
                                       13

<PAGE>
    companies, subsidiaries and/or other affiliates. This stockholder is
    reporting the combined holdings of the entities for the purpose of
    administrative convenience.
 
(7) The business address for this stockholder is 11 Devonshire Square, London,
    England. Pursuant to a Schedule 13G filed with the SEC, as of February 11,
    1999, this stockholder may have direct or indirect voting and/or investment
    discretion over these shares of Common Stock which are held for the benefit
    of its clients by its separate accounts, externally managed accounts,
    registered investment companies, subsidiaries and/or other affiliates. This
    stockholder is reporting the combined holdings of the entities for the
    purpose of administrative convenience.
 
(8) Includes 15,000 shares of Common Stock held by Mr. Klein through a family
    trust and 117,832 shares held by Mr. Feldman through a family limited
    liability company.
 
    Section 16(a) of the Exchange Act requires the Company's executive officers
and directors, and persons who own more than 10% of a registered class of the
Company's equity securities ("10% Holders"), to file reports of ownership and
changes in ownership with the Securities and Exchange Commission ("SEC") and the
New York Stock Exchange. Officers, directors and 10% Holders are required by SEC
regulation to furnish the Company with copies of all Section 16(a) forms that
they file. To the Company's knowledge, based solely on review of the copies of
such reports furnished to the Company, all Section 16(a) filing requirements
applicable to its executive officers, directors and 10% Holders were satisfied,
except that Ann Iseley inadvertently failed to make a timely Form 3 filing to
report her appointment as Executive Vice President and Chief Financial Officer
of the Company. This oversight was corrected in a subsequent filing.
 

                          PROPOSAL 3: APPROVAL OF THE
                  AMENDED 1997 STOCK OPTION AND INCENTIVE PLAN
 
    In December 1997, March 1998 and March 1999, the Board of Directors amended
the 1997 Stock Option and Incentive Plan.
 
    THE BOARD OF DIRECTORS RECOMMENDS A VOTE FOR THE APPROVAL OF THE AMENDED
1997 STOCK OPTION AND INCENTIVE PLAN.
 
    The Company's 1997 Stock Option and Incentive Plan ("1997 Stock Option and
Incentive Plan") was adopted at the time of the IPO in order to provide a means
for the Company to implement its long-term incentive program for executive
officers and directors, as well as to provide incentives for other officers and
employees. The Company's objective in providing these incentives is to attract,
retain and motivate talented persons that will maximize stockholder value. In
this regard, the Company has sought to provide incentives for a broad range of
persons employed by the Company in granting awards under the 1997 Stock Option
and Incentive Plan.
 
    In order to ensure that the Company can continue the broad-based application
of its long-term incentive program, the Board of Directors has amended the 1997
Stock Option and Incentive Plan. The Amended 1997 Stock Option and Incentive
Plan includes "consultants" as among the persons eligible to receive awards
under the plan and provides for the grant of awards in respect of up to an
aggregate of 1,700,000 shares of Common Stock. (The 1997 Stock Option and
Incentive Plan provided for the grant of awards in respect of up to an aggregate
of 1,100,000 shares of Common Stock.) The Amended 1997 Stock Option and
Incentive Plan is otherwise the same as the 1997 Stock Option and Incentive
Plan.
 
    The following is a description of the Amended 1997 Stock Option and
Incentive Plan:
 
    The Amended 1997 Stock Option and Incentive Plan authorizes (i) the grant of
stock options that qualify as incentive stock options under Section 422 of the
Code ("ISOs"), (ii) the grant of stock options that do not so qualify ("NQSOs"),
(iii) the grant of stock options in lieu of cash Directors' fees and employee
bonuses, and (iv) grants of shares of Common Stock, in lieu of cash
compensation. The exercise
 
                                       14

<PAGE>
price of stock options is determined by the Compensation Committee, but may not
be less than 100% of the fair market value of the shares of Common Stock on the
date of grant in the case of ISOs; provided that, in the case of grants of NQSOs
granted in lieu of cash Directors' fees and employee bonuses, the exercise price
may not be less than 50% of the fair market value of the shares of Common Stock
on the date of grant. The Company has reserved 1,100,000 shares of Common Stock
for issuance under the Amended 1997 Stock Option and Incentive Plan. As of
December 31, 1998, options for 1,698,000 shares of Common Stock had been granted
pursuant to the Amended 1997 Stock Option and Incentive Plan, including options
to purchase 375,000 shares of Common Stock granted to the Named Executive
Officers. In that regard, as of December 31, 1998, David J. Nettina had been
granted options to purchase 175,000 shares of Common Stock (100,000 of which
were awarded in October, 1998), Stephen Green had been granted options to
purchase 125,000 shares of Common Stock (which options were granted in October,
1998), Nancy A. Peck and Ben Feldman had each been granted options to purchase
100,000 shares of Common Stock (50,000 of which were awarded to each in October,
1998), and Steven H. Klein and Gerard Nocera had each been granted options to
purchase 125,000 shares of Common Stock (75,000 of which were awarded to each in
October, 1998). See "Executive Compensation." In addition, each non-employee
(including Mr. Levy, nominee for election as a Director at the Annual Meeting)
was granted options to purchase 6,000 shares of Common Stock upon completion of
the IPO. See "Proposal I--Election of Directors -Director Compensation." On
March 30, 1999, the last reported sale price of the Common Stock on the New York
Stock Exchange was $17.8125.
 
    CERTAIN FEDERAL INCOME TAX CONSEQUENCES OF THE AMENDED 1997 STOCK OPTION AND
INCENTIVE PLAN.  The following is a brief summary of the principal Federal
income tax consequences of awards under the Amended 1997 Stock Option and
Incentive Plan. The summary is based upon current Federal income tax laws and
interpretations thereof, all of which are subject to change at any time,
possibly with retroactive effect. The summary is not intended to be exhaustive
and, among other things, does not describe state, local or foreign tax
consequences.
 
    A participant is not subject to Federal income tax either at the time of
grant or at the time of exercise of an ISO. However, upon exercise, the
difference between the fair market value of the Common Stock and the exercise
price is an item of tax preference subject to the possible application of the
alternative minimum tax. If a participant does not dispose of Common Stock
acquired through the exercise of an ISO in a "disqualifying disposition" (I.E.,
no disposition occurs within two years from the date of grant of the share
option nor within one year of the transfer of the Common Stock to the
participant), then the participant will be taxed only upon the gain, if any,
from the sale of such Common Stock, and such gain will be taxable as gain from
the sale of a capital asset.
 
    The Company will not receive any tax deduction on the exercise of an ISO or,
if the above holding period requirements are met, on the sale of the underlying
Common Stock. If there is a disqualifying disposition (I.E., one of the holding
period requirements is not met), the participant will be treated as receiving
compensation subject to ordinary income tax in the year of the disqualifying
disposition and the Company will be entitled to a deduction for compensation
expense in an amount equal to the amount included in income by the participant.
The participant generally will be required to include in income an amount equal
to the difference between the fair market value of the Common Stock at the time
of exercise and the exercise price. Any appreciation in value after the time of
exercise will be taxed as capital gain and will not result in any deduction by
the Company.
 
    If NQSOs are granted to a participant, there are no Federal income tax
consequences at the time of grant. Upon exercise of the option, the participant
must report as ordinary income an amount equal to the difference between the
exercise price and the fair market value of the Common Stock on the date of
exercise. The Company will receive a tax deduction in like amount. Any
appreciation in value after the time of exercise will be taxed as capital gain
and will not result in any deduction by the Company.
 
                                       15

<PAGE>

                 CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
 
FORMATION TRANSACTIONS
 
    In connection with the formation of the Company in June 1997, certain
continuing investors (which included Stephen L. Green, members of his immediate
family and unaffiliated partners) received an aggregate of 2,383,284 Units for
their direct and indirect interests in certain properties and in the commercial
real estate businesses acquired by the Company. In addition, in connection with
the formation of the Company, the Operating Partnership used $20 million to
repay a portion of a $46 million loan made by Lehman Brothers Holdings, Inc. to
Green Realty LLC and invested in Treasury securities pledged as collateral
therefor which, upon repayment of the LBHI Loan, was released to Stephen L.
Green.
 
C
LEANING SERVICES
 
    First Quality Maintenance, L.P. ("First Quality") provides cleaning and
related services with respect to certain of the properties owned by the Company.
First Quality is owned by Gary Green, a son of Stephen L. Green. First Quality
also provides additional services directly to tenants on a separately negotiated
basis. The aggregate amount of fees to First Quality for services provided
(excluding services provided directly to tenants) was approximately $296,000 in
1996, $325,000 in 1997 and $1.4 million in 1998. In addition, the cleaning
entity has the non-exclusive opportunity to provide cleaning and related
services to individual tenants at the Company's properties on a basis separately
negotiated with any tenant seeking such additional services. The cleaning entity
will provide such services to individual tenants pursuant to agreements on
customary terms (including at market rates). First Quality leases 3,740 square
feet of space at 70 West 36th Street pursuant to a lease that expires on
December 31, 2005 and provides for annual rental payments of approximately
$68,660.
 
SECURITY SERVICES
 
    Classic Security LLC ("Classic Security") provides security services with
respect to certain of properties owned by the Company. Classic Security is owned
by Gary Green, a son of Stephen L. Green. The aggregate amount of fees for such
services was approximately $24,000 in 1996, $143,000 in 1997 and $718,000 in
1998.
 

RELATED PARTY TRANSACTIONS
 
    During 1996, HRA, a real estate and management consulting firm of which John
H. Alschuler, Jr., a director of the Company, is the President provided
consulting services for S.L. Green Leasing, Inc. ("S.L. Green Leasing"). HRA
negotiated certain New York City benefit programs for Information Builders,
Inc., a tenant that was represented by S.L. Green Leasing, in connection with
its relocation from 1250 Broadway to 2 Penn Plaza. For such services, HRA was
paid a total of $128,962.99 by S.L. Green Leasing.
 
 
                                OTHER MATTERS
 
SOLICITATION OF PROXIES
 
    The cost of solicitation of proxies in the form enclosed herewith will be
paid by the Company. In addition to the solicitation of proxies by mail, the
directors, officers and employees of the Company may also solicit proxies
personally or by telephone without additional compensation for such activities.
The Company will also request persons, firms and corporations holding shares in
their names or in the names of their nominees, which are beneficially owned by
others, to send proxy materials to and obtain proxies from such beneficial
owners. The Company will reimburse such holders for their reasonable expenses.
In addition, the Company intends to utilize the proxy solicitation services of
The Financial Relations Board and Beacon Hill Partners at an aggregate estimated
cost of $7,500 plus out-of-pocket expenses.
 
                                       16

<PAGE>
STOCKHOLDER PROPOSALS
 
    Stockholder proposals intended to be presented at the 2000 annual meeting of
stockholders must be received by the Secretary of the Company no later than
December 2, 1999 in order to be considered for inclusion in the Company's proxy
statement relating to the 2000 meeting pursuant to Rule 14a-8 under the
Securities Exchange Act of 1934, as amended ("Rule 14a-8").
 
    For a proposal of a stockholder to be presented to the Company's 2000 annual
meeting of stockholders, other than a stockholder proposal included in the
Company's proxy statement pursuant to Rule 14a-8, it must be received at the
principal executive offices of the Company after November 21, 1999 and on or
before March 15, 2000, unless the 2000 annual meeting of stockholders is
scheduled to take place before May 12, 2000. The Company's Bylaws provide that
any stockholder wishing to nominate a director or have a stockholder proposal
other than a stockholder proposal included in the Company's proxy statement
pursuant to Rule 14a-8, considered at an annual meeting must provide written
notice of such nomination or proposal and appropriate supporting documentation,
as set forth in the Bylaws, to the Company at its principal executive offices
not less than 75 days nor more than 180 days prior to the anniversary of the
immediately preceding annual meeting of stockholders (the "Anniversary Date");
provided, however, that in the event that the annual meeting is scheduled to be
held more than seven calendar days prior, or more than 60 days subsequent, to
the Anniversary Date, such nominations or proposals must be delivered to the
Company not earlier than the 180th day prior to such meeting and not later than
the later of the 75th day prior to such annual meeting or the twentieth day
following the earlier of the day on which public announcement of the meeting is
first made or notice of the meeting is mailed to stockholders. Any such proposal
should be mailed to: SL Green Realty Corp., 420 Lexington Avenue, New York, New
York 10170, Attn: Benjamin P. Feldman, Secretary.
 
OTHER MATTERS
 
    The Board of Directors does not know of any matters other than those
described in this Proxy Statement that will be presented for action at the
Annual Meeting. If other matters are presented, proxies will be voted in
accordance with the best judgment of the proxy holders.
 
                                          BY ORDER OF THE BOARD OF DIRECTORS
 
                                                   [LOGO]
 
                                          BENJAMIN P. FELDMAN
 
                                          SECRETARY
 
New York, New York
March 31, 1999
 
                                       17

<PAGE>

                        SL GREEN REALTY CORP.
                        420 Lexington Avenue
                       New York, New York  10170
     Proxy for Annual Meeting of Stockholders to be held on May 19, 1999
           this proxy is solicited by the the board of directors

         The undersigned hereby constitutes and appoints Stephen L. Green and 
Benjamin P. Feldman and either of them, as Proxies of the undersigned, with 
full power of substitution, to vote all shares of Common Stock of SL Green 
Realty Corp. (the "Company") held of record by the undersigned as of the 
close of business on March 26, 1999, on behalf of the undersigned at the 
Annual Meeting of Stockholders (the "Annual Meeting") to be held at 110 East 
42nd Street, New York, New York, 10:00 a.m., local time, on Wednesday, May 
19, 1999, and at any adjournments or postponements thereof. When properly 
executed, this proxy will be voted in the manner directed herein by the 
undersigned stockholder(s).  If no direction is given, this proxy will be 
voted FOR the nominees of the Board of Directors listed in Proposal 1 and FOR 
Proposal 2 and Proposal 3.  In their discretion, the Proxies are each 
authorized to vote upon such other business as may properly come before the 
Annual Meeting and any adjournments or postponements thereof.

Please vote and sign on other side and return promptly in the enclosed envelope.

                           (SEE REVERSE SIDE)


<PAGE>

X  Please mark your 
   votes as in this example.


<TABLE>
<CAPTION>

                                                             (except
                                                             as marked
                                                             to the
                                                             contary
                                                   WITHHOLD   below)
                                         FOR ALL   FOR ALL  FOR ALL                                         FOR   ABSTAIN  AGAINST
<S>                                    <C>       <C>       <C>        <C>                                  <C>   <C>      <C>
1. To elect two Class II Directors of     / /       / /      / /        2. To ratify the selection of        / /    / /      / /
   the Company to serve until the 2002                                     Ernst & Young LLP as the
   Annual Meeting of Stockholders and                                      independent auditors
   until their respective successors                                       of the Company for the fiscal
   are duly elected and qualified.                                         year ending December 31, 1999.

Nominees:       Benjamin P. Feldman                                     3. To approve the Company's Amended  / /    / /      / /
                John S. Levy                                               1997 Stock Option and Incentive Plan.

FOR, except vote withheld from the following nominee(s):                4. To consider and act upon any     / /    / /      / /
                                                                           other matters that may properly be  
                                                                           brought before the Annual Meeting   
                                                                           and at any adjournments or          
                                                                           postponements thereof.              
 
                                                                           MARK HERE FOR ADDRESS CHANGE     / /
                                                                           AND NOTE BELOW

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

                                                                           The undersigned hereby acknowledge(s)              
                                                                           receipt of a copy of the accompanying              
                                                                           Notice of Annual Meeting of Stockholders,          
                                                                           the Proxy Statement with respect                   
                                                                           thereto and the Company[cad 213]s 1999 Annual Report
- -------------------------  --------------------------  Date:____ , 1997    to Stockholders and hereby revoke(s) any            
Signature (title, if any)  Signature, if held jointly                      proxy or proxies heretofore given. This proxy       
                                                                           may be revoked at any time before it is exercised.  


Note: Please sign exactly as name appears hereon. Joint owners should each 
sign. When signing as attorney, executor, administrator, trustee or guardian, 
please give full title as such.


</TABLE>