KILROY REALTY CORP
PRE 14A, 1998-03-31
REAL ESTATE INVESTMENT TRUSTS
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<PAGE>   1
 
                            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:
 
<TABLE>
<S>                                                          <C>
[X]  Preliminary Proxy Statement
[ ]  Confidential, for Use of the Commission Only
    (as permitted by Rule 14a-6(e)(2))
[ ]  Definitive Proxy Statement
[ ]  Definitive Additional Materials
[ ]  Soliciting Material Pursuant to Section 240.14a-11(c) or 240.14a-12
</TABLE>
 
                           KILROY REALTY CORPORATION
- --------------------------------------------------------------------------------
                (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)(4) 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.:
 
- --------------------------------------------------------------------------------
 
     (3)  Filing Party:
 
- --------------------------------------------------------------------------------
 
     (4)  Date Filed:
 
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<PAGE>   2
 
                                [CO. LOGO HERE]
 
                           KILROY REALTY CORPORATION
                           2250 EAST IMPERIAL HIGHWAY
                          EL SEGUNDO, CALIFORNIA 90245
 
March   , 1998
 
Dear Stockholder:
 
     You are cordially invited to attend the 1998 annual meeting of stockholders
of KILROY REALTY CORPORATION to be held on May 12, 1998, at 10:00 a.m. at The
Beverly Hilton located at 9876 Wilshire Boulevard, Beverly Hills, California
90210.
 
     Information about the meeting and the various matters on which the
stockholders will act is included in the Notice of Annual Meeting of
Stockholders and Proxy Statement which follow. Also included is a Proxy Card and
postage paid return envelope.
 
     It is important that your shares be represented at the meeting. Whether or
not you plan to attend, we hope that you will complete and return your Proxy
Card in the enclosed envelope as promptly as possible.
 
                                          Sincerely,
 
                                          Richard E. Moran Jr.
                                          Executive Vice President,
                                          Chief Financial Officer and Secretary
<PAGE>   3
 
                           KILROY REALTY CORPORATION
                           2250 EAST IMPERIAL HIGHWAY
                          EL SEGUNDO, CALIFORNIA 90245
 
                    NOTICE OF ANNUAL MEETING OF STOCKHOLDERS
                            TO BE HELD MAY 12, 1998
 
To the Stockholders of Kilroy Realty Corporation:
 
     NOTICE IS HEREBY GIVEN that the annual meeting of stockholders (the "Annual
Meeting") of Kilroy Realty Corporation, a Maryland corporation (the "Company"),
will be held at The Beverly Hilton located at 9876 Wilshire Boulevard, Beverly
Hills, California 90210 on May 12, 1998, at 10:00 a.m., local time, for the
following purposes:
 
     1. To elect two directors to the Company's Board of Directors to serve
        until the annual meeting of stockholders in the year 2001 and until
        their successors are duly elected and qualify;
 
     2. The approval of an amendment to the Company's 1997 Stock Option and
        Incentive Plan (the "Stock Incentive Plan Amendment") (i) to increase
        the number of shares of Common Stock issuable under the plan to an
        amount equal to 8.9% of the Company's total issued and outstanding
        shares of Common Stock as of May 12, 1998, and on each January 1, April
        1, July 1 and October 1 thereafter to increase the number of shares of
        Common Stock issuable under the plan to 8.9% of the number of shares of
        Common Stock issued and outstanding as of the last day of the
        immediately preceding fiscal quarter, commencing July 1, 1998, (ii) to
        increase the maximum number of shares of the Common Stock issuable under
        the plan as "incentive stock options," as defined in Section 422 of the
        Code, to 2,330,000 shares of the Common Stock and (iii) to establish, as
        a separate and distinct plan under the Stock Incentive Plan, the grant
        of a plan with incentive stock options to the executive officers and
        employees of the Company, and
 
     3. To transact such other business as may properly come before the meeting
        or any adjournment or postponement thereof.
 
     The Board of Directors has fixed the close of business on March 24, 1998 as
the record date (the "Record Date") for determining the stockholders entitled to
receive notice of and to vote at the Annual Meeting or any adjournment or
postponement thereof.
 
     THE ENCLOSED PROXY IS SOLICITED BY THE BOARD OF DIRECTORS OF THE COMPANY,
WHICH RECOMMENDS THAT STOCKHOLDERS VOTE FOR THE ELECTION OF THE NOMINEES NAMED
THEREIN AND VOTE FOR THE AMENDMENT OF THE STOCK INCENTIVE PLAN. Please refer to
the attached Proxy Statement, which forms a part of this Notice and is
incorporated herein by reference, for further information with respect to the
business to be transacted at the Annual Meeting.
 
     STOCKHOLDERS ARE CORDIALLY INVITED TO ATTEND THE ANNUAL MEETING IN PERSON.
YOUR VOTE IS IMPORTANT. ACCORDINGLY, YOU ARE URGED TO COMPLETE, SIGN, DATE AND
RETURN THE ACCOMPANYING PROXY CARD WHETHER OR NOT YOU PLAN TO ATTEND THE ANNUAL
MEETING.
 
                                          By Order of the Board of Directors,
 
                                          Richard E. Moran Jr.
                                          Executive Vice President,
                                          Chief Financial Officer and Secretary
 
March   , 1998
El Segundo, California
<PAGE>   4
 
                           KILROY REALTY CORPORATION
                           2250 EAST IMPERIAL HIGHWAY
                          EL SEGUNDO, CALIFORNIA 90245
                            ------------------------
 
                         ANNUAL MEETING OF STOCKHOLDERS
                            TO BE HELD MAY 12, 1998
                            ------------------------
 
                                PROXY STATEMENT
                            ------------------------
 
                                  INTRODUCTION
 
GENERAL
 
     This Proxy Statement is furnished in connection with the solicitation by
the Board of Directors of Kilroy Realty Corporation, a Maryland corporation (the
"Company"), of proxies from the holders of the Company's issued and outstanding
shares of common stock, par value $.01 per share (the "Common Stock"), to be
exercised at the Annual Meeting of Stockholders (the "Annual Meeting") to be
held on May 12, 1998 at The Beverly Hilton located at 9876 Wilshire Boulevard,
Beverly Hills, California 90210 at 10:00 a.m. local time, and at any
adjournment(s) or postponement(s) thereof for the purposes set forth in the
accompanying Notice of Annual Meeting.
 
     At the Annual Meeting, the stockholders of the Company will be asked to
consider and vote upon the following proposals (the "Proposals"):
 
     1. The election of two directors to the Company's Board of Directors to
        serve until the annual meeting of stockholders to be held in the year
        2001 and until their successors are duly elected and qualify;
 
     2. The approval of the Stock Incentive Plan Amendment (i) to increase the
        number of shares of Common Stock issuable under the plan to an amount
        equal to 8.9% of the Company's total issued and outstanding shares of
        Common Stock as of May 12, 1998, and on each January 1, April 1, July 1
        and October 1 thereafter to increase the number of shares of Common
        Stock issuable under the plan to 8.9% of the number of shares of Common
        Stock issued and outstanding as of the last day of the immediately
        preceding fiscal quarter, commencing July 1, 1998, (ii) to increase the
        maximum number of shares of the Common Stock issuable under the plan as
        "incentive stock options," as defined in Section 422 of the Code, to
        2,330,000 shares of the Common Stock and (iii) to establish, as a
        separate and distinct plan under the Stock Incentive Plan, the grant of
        a plan with incentive stock options to the executive officers and
        employees of the Company; and
 
     3. Such other business as may properly come before the Annual Meeting.
 
     Only the holders of record of the shares of Common Stock at the close of
business on March 24, 1998 (the "Record Date") are entitled to notice of and to
vote at the Annual Meeting. Each share of Common Stock is entitled to one vote
on all matters. As of the Record Date, 26,199,888 shares of Common Stock were
outstanding. This Proxy Statement and enclosed form of proxy are first being
mailed to the stockholders of the Company on or about March 30, 1998.
 
     A majority of the shares of Common Stock outstanding must be represented at
the Annual Meeting in person or by proxy to constitute a quorum for the
transaction of business at the Annual Meeting. Shares represented by proxies
that reflect abstentions or "broker non-votes" will be counted as shares that
are present and entitled to vote for purposes of determining the presence of a
quorum. In order to be elected as a director, a nominee must receive a plurality
of all the votes cast at the Annual Meeting at which a quorum is present. For
purposes of calculating votes cast in the election of the directors, abstentions
or broker non-votes will not be counted as votes cast and will have no effect on
the result of the vote on the Proposal regarding the election of the director
nominees. The affirmative vote of the holders of a majority of the shares of
Common Stock entitled to vote present in person or by proxy at the Annual
Meeting is required to approve the Stock Incentive Plan Amendment. Abstentions
as to the Stock Incentive Plan Amendment will be treated as voted for
<PAGE>   5
 
purposes of determining the approval of that proposal and will have the same
effect as a vote against such proposal while proxies that reflect broker
non-votes will be treated as unvoted for purposes of determining approval and
will not be counted as votes for or against the proposal.
 
     The shares of Common Stock represented by all properly executed proxies
returned to the Company will be voted at the Annual Meeting as indicated or, if
no instruction is given, FOR (i) election of the two director nominees named
herein and (ii) approval of the Stock Incentive Plan Amendment. As to any other
business which may properly come before the Annual Meeting, all properly
executed proxies will be voted by the persons named therein in accordance with
their discretion. The Company does not presently know of any other business
which may come before the Annual Meeting. However, if any other matter properly
comes before the Meeting, or any adjournment or postponement thereof, which may
properly be acted upon, unless otherwise indicated the proxies solicited hereby
will be voted on such matter in accordance with the discretion of the proxy
holders named therein. Any person giving a proxy has the right to revoke it at
any time before it is exercised (i) by filing with the Secretary of the Company
a duly signed revocation or a proxy bearing a later date or (ii) by electing to
vote in person at the Annual Meeting. Mere attendance at the Annual Meeting will
not revoke a proxy.
 
     NO PERSON IS AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS PROXY STATEMENT, AND, IF
GIVEN OR MADE, SUCH INFORMATION MUST NOT BE RELIED UPON AS HAVING BEEN
AUTHORIZED AND THE DELIVERY OF THIS PROXY STATEMENT SHALL, UNDER NO
CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE
AFFAIRS OF THE COMPANY SINCE THE DATE HEREOF.
 
     The cost of soliciting proxies will be paid by the Company. Proxies may be
solicited by directors, officers and employees of the Company in person or by
mail, telephone or facsimile transmission, but such persons will not be
specially compensated therefor. ChaseMellon Shareholder Services, 450 West 33rd
Street, New York, New York 10001, telephone (212) 273-8080, has been retained to
assist in soliciting proxies by mail, telephone or personal solicitation for a
fee of $3,500 plus expenses.
 
     The Company's executive offices are located at 2250 East Imperial Highway,
El Segundo, California 90245, telephone (310) 563-5500. References herein to the
"Company" refer to Kilroy Realty Corporation and its subsidiaries, unless the
context otherwise requires.
                            ------------------------
 
              The date of this Proxy Statement is March   , 1998.
 
                                        2
<PAGE>   6
 
                       PROPOSAL 1: ELECTION OF DIRECTORS
 
     Pursuant to the Company's Articles of Incorporation, as amended (the
"Charter"), the Company's bylaws (the "Bylaws"), and the resolutions adopted by
the Board of Directors (the "Board"), the Board presently consists of seven
directors. The Board is divided into three classes, as nearly equal in number as
practicable, serving staggered three-year terms, consisting of two members whose
term will expire at the Annual Meeting, three members whose terms will expire at
the 1999 annual meeting of stockholders and two members whose terms will expire
at the 2000 annual meeting of stockholders.
 
     Pursuant to the Charter, at each annual meeting the successors to the class
of directors whose terms expire at such meeting shall be elected to hold office
for a term expiring at the annual meeting of stockholders held in the third year
following the year of their election. Accordingly, at the Annual Meeting, the
nominees for election will be elected to hold office for a term of three years
until the annual meeting of stockholders to be held in the year 2001, and until
their successors are duly elected and qualified. Except where otherwise
instructed, proxies solicited by this Proxy Statement will be voted for the
election of each of the nominees to the Board listed below. Each such nominee
has consented to be named in this Proxy Statement and to serve as a director if
elected.
 
     The information below relating to the nominees for election as director and
to each of the other directors whose terms of office continue after the Annual
Meeting has been furnished to the Company by the respective individuals.
 
     The Board recommends a vote FOR the election of John R. D'Eathe and William
P. Dickey to serve until the annual meeting of stockholders to be held in the
year 2001 and until their respective successors are duly elected and qualify.
 
NOMINEES FOR DIRECTOR
 
     The following table sets forth certain current information with respect to
the nominees for directors to the Board of the Company:
 
<TABLE>
<CAPTION>
                      NAME                         AGE    DIRECTOR SINCE
                      ----                         ---    --------------
<S>                                                <C>    <C>
John R. D'Eathe..................................  62          1997
William P. Dickey................................  55          1997
</TABLE>
 
     The following is a biographical summary of the experience of the nominees
for directors to the Board of the Company:
 
     JOHN R. D'EATHE, age 62, has been a member of the Board of Directors of the
Company since October 1997. Mr. D'Eathe is a 30-year veteran of real estate
development and management in Canada, Europe and the United States. Since 1980,
Mr. D'Eathe has been serving as the president of Freehold Development Canada,
which is primarily focused on commercial and industrial development in western
Canada. From 1970 to 1979, Mr. D'Eathe was president and CEO of Canadian
Freehold Properties Ltd., a Canadian-based development company involved in
commercial projects in both Canada and the United States. From 1965 to 1969, he
also served as a director and senior vice president of Grosvenor International,
a private real estate group that owns and develops property around the world.
Since 1997, Mr. D'Eathe has been the chairman and president of Penreal Advisors
Ltd., one of Canada's largest pension fund real estate investment and advisory
firms. In addition, he has been the chairman of Spark Music Inc., of Vancouver,
since 1992, and has been a director of John Hancock's Maritime Life Assurance
Company since 1995. Mr. D'Eathe holds an honors Bachelor of Laws degree from
London University, UK and is an associate member of The Canadian Bar
Association.
 
     WILLIAM P. DICKEY, age 55, has been a member of the Board of Directors of
the Company since its inception as a public company in January 1997. Mr. Dickey
has been the president of The Dermot Company, Inc., a real estate investment and
management company since 1990. From 1986 to 1990, Mr. Dickey was a managing
director of real estate for The First Boston Corporation. Prior to 1986, Mr.
Dickey was a partner at the New York law firm of Cravath, Swaine & Moore, where
he started as an associate beginning in 1974.
 
                                        3
<PAGE>   7
 
Mr. Dickey is a member of the board of directors of Horizon Group, Inc., a real
estate investment trust ("REIT") which invests primarily in factory outlet
centers, and Mezzanine Capital Property Investors, Inc., a REIT which invests
primarily in East Coast and Midwest office/mixed use space. Mr. Dickey received
his undergraduate degree from the United States Air Force Academy, his Masters
Degree from Georgetown University and his Juris Doctor Degree from Columbia Law
School.
 
DIRECTORS CONTINUING IN OFFICE
 
     Information concerning the other directors of the Company whose terms do
not expire at the Annual Meeting is set forth below.
 
<TABLE>
<CAPTION>
            NAME               AGE                       POSITION                        TERM EXPIRES
            ----               ---                       --------                        ------------
<S>                            <C>    <C>                                                <C>
John B. Kilroy, Sr...........   75    Chairman of the Board                                  1999
John B. Kilroy, Jr...........   49    President, Chief Executive Officer and Director        2000
Richard S. Allen.............   49    Director                                               1999
Matthew J. Hart..............   45    Director                                               1999
Dale F. Kinsella.............   48    Director                                               2000
</TABLE>
 
     JOHN B. KILROY, SR., age 75, has served as the Company's Chairman of the
Board of Directors since its incorporation in September 1996, and served in the
same capacity for Kilroy Industries since 1954. In 1947, Mr. Kilroy founded the
businesses which were incorporated in 1952 as the entity known as Kilroy
Industries ("KI"), the predecessor to the Company. Mr. Kilroy served as KI's
President from 1952 until 1981, and as its Chairman of its Board of Directors
from 1954 to 1997. Mr. Kilroy is a nationally recognized member of the real
estate community, providing the Company with strategic leadership and a
broadly-based network of relationships. Mr. Kilroy is a trustee of the
Independent Colleges of Southern California, serves on the Board of Directors of
Pepperdine University, and is a past trustee of Harvey Mudd College.
 
     JOHN B. KILROY, JR., age 49, has served as the Company's President, Chief
Executive Officer and Director since its incorporation in September 1996. Prior
to joining the Company, Mr. Kilroy served in the same capacity for KI and was
responsible for the overall management of all facets of KI and its various
affiliates since 1981. Mr. Kilroy has been involved in all aspects of commercial
and industrial real estate acquisition, sales, development, construction,
leasing, financing, and entitlement since 1967 and worked for KI for over 25
years. Mr. Kilroy became President of KI in 1981 and was elected Chief Executive
Officer in 1991. Prior to that time he held positions as Executive Vice
President and Vice President -- Leasing & Marketing. He is a member of the
National Realty Committee and the Urban Land Institute, and is a trustee of the
El Segundo Employers Association, and a past trustee of Viewpoint School, the
Jefferson Center For Character Education and the National Fitness Foundation.
 
     RICHARD S. ALLEN, age 49, has been a member of the Board of Directors of
the Company since October 1997. Mr. Allen is the majority equity owner and Chief
Executive Officer of The Allen Group ("TAG"), a group of affiliated real estate
development and investment companies based in Visalia, California which he
formed in 1989 and which is active in the acquisition, development and
management of residential projects throughout the United States and commercial
projects in markets not served by the Company. Prior to forming TAG, Mr. Allen
was a principal in Imperial Cup Corporation for 20 years which grew from a
start-up company to the largest manufacturer of industrial vending cups in the
United States.
 
     MATTHEW J. HART, age 45, has been a member of the Board of Directors of the
Company since its inception as a public company in January 1997. Mr. Hart joined
Hilton Hotels Corporation in 1996 and is its Executive Vice President and Chief
Financial Officer. Mr. Hart is primarily responsible for Hilton's corporate
finance and development activities. Prior to joining Hilton, Mr. Hart was Senior
Vice President and Treasurer of The Walt Disney Company from 1995 to 1996. From
1981 to 1995, Mr. Hart was employed by Host Marriott Corporation (formerly known
as Marriott Corporation), most recently as its Executive Vice President and
Chief Financial Officer. Before joining Marriott Corporation, Mr. Hart had been
a lending officer with Bankers Trust Company in New York. Mr. Hart is a member
of the board of directors of First Washington Realty Trust, Inc., a REIT which
invests primarily in retail properties. Mr. Hart received his
 
                                        4
<PAGE>   8
 
undergraduate degree from Vanderbilt University and a Masters of Business
Administration form Columbia University.
 
     DALE F. KINSELLA, age 49, has been a member of the Board of Directors of
the Company since its inception as a public company in January 1997. For the
past twenty years, Mr. Kinsella has been a partner with the Los Angeles law firm
of Kinsella, Boesch, Fujikawa & Towle. Mr. Kinsella received his undergraduate
degree from the University of California, Santa Barbara and his Juris Doctor
degree from the University of California, Los Angeles.
 
BOARD OF DIRECTORS MEETINGS AND ATTENDANCE
 
     During the period from the Company's inception as a public company on
January 31, 1997 to December 31, 1997, the Board held four regular quarterly
meetings and one special telephonic meeting. No director attended fewer than 75%
of the aggregate of (i) the total number of meetings of the Board while they
were on the Board and (ii) the total number of meetings of the committees of the
Board on which such directors served.
 
BOARD COMMITTEES
 
     The Board of Directors of the Company has an Audit Committee, an
Independent Committee, an Executive Committee and an Executive Compensation
Committee.
 
     Audit Committee. The Audit Committee consists of two Independent Directors
(as hereinafter defined), Messrs. Hart, the Chairman, and Mr. D'Eathe. The Audit
Committee makes recommendations concerning the engagement of independent public
accountants, reviews with the independent public accountants the scope and
results of the audit engagement, 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 no meetings during 1997.
 
     Independent Committee. The Independent Committee consists of four
Independent Directors, Messrs. Kinsella, the Chairman, and Dickey, Hart and
D'Eathe. The Independent Committee has the authority to approve transactions
between the Company and its affiliates, including, without limitation, John B.
Kilroy, Sr. or John B. Kilroy, Jr. and their respective affiliates. The
Independent Committee held two meetings during 1997.
 
     Executive Committee. The Executive Committee consists of Messrs. Kilroy,
Jr., the Chairman, and Kilroy, Sr., Kinsella and Allen. Subject to the Company's
conflict of interest policies, the Executive Committee has authority to acquire
and dispose of real property and the power to authorize, on behalf of the full
Board, the execution of certain contracts and agreements, including those
related to the borrowing of money by the Company (and, consistent with the
Second Amended and Restated Agreement of Limited Partnership (the "Partnership
Agreement") of Kilroy Realty, L.P. (the "Operating Partnership"), to cause the
Operating Partnership to take such actions). The Executive Committee held no
meetings during 1997.
 
     Executive Compensation Committee. The Executive Compensation Committee
consists of two Independent Directors, Messrs. Dickey, the Chairman, and
Kinsella. The function of the Executive Compensation Committee is to (i)
establish, review, modify, and adopt remuneration levels for executive officers
of the Company, and (ii) implement the Company's Stock Incentive Plan and any
other incentive programs. The Executive Compensation Committee held no meetings
during 1997.
 
COMPENSATION OF DIRECTORS
 
     The Company currently pays its Independent Directors annual compensation of
$12,000 for their services. In addition, each Independent Director receives
$1,000 for each committee meeting chaired by such director. Each Independent
Director is also reimbursed for reasonable expenses incurred to attend director
and committee meetings. Officers of the Company who are directors are not paid
any directors' fees. In addition, under the Stock Incentive Plan, upon his
initial election to the Board, each Independent Director is
                                       

                                       5
<PAGE>   9
 
automatically granted options to purchase 10,000 shares of Common Stock which
vest pro rata in annual installments over a three-year period, and on each
anniversary of his election to the Board, each Independent Director receives an
option to purchase 1,000 shares of Common Stock which options also vest pro rata
in annual installments over a three-year period. All stock options will be
issued pursuant to the Stock Incentive Plan at an exercise price equal to or
greater than the fair market value of the Common Stock at the date of grant. An
"Independent Director" is a director who is not an employee, officer or
affiliate of the Company or a subsidiary or a division thereof, or a relative of
a principal executive officer, or who is not an individual member of an
organization acting as an advisor, consultant or legal counsel, receiving
compensation on a continuing basis from the Company in addition to director's
fees. On January 31, 1997, John B. Kilroy, Sr., who is not an Independent
Director, received an option to purchase 15,000 shares of Common Stock which
vests over a three-year period. As of December 31, 1997, Messrs. Dickey, Hart
and Kinsella each hold options to purchase 10,000 shares of Common Stock at an
exercise price of $23.00 per share, of which 3,333 are currently exercisable,
and Mr. D'Eathe holds options to purchase 10,000 shares of Common Stock at an
exercise price of $27.38 per share, of which none are currently exercisable.
 
VOTE REQUIRED
 
     The election of each director requires the plurality of the votes cast by
the holders of the shares of Common Stock entitled to vote thereon present in
person or by proxy at the Annual Meeting. THE BOARD RECOMMENDS A VOTE FOR THE
ELECTION OF JOHN R. D'EATHE AND WILLIAM P. DICKEY TO SERVE UNTIL THE ANNUAL
MEETING OF STOCKHOLDERS TO BE HELD IN THE YEAR 2001 AND UNTIL THEIR RESPECTIVE
SUCCESSORS ARE DULY ELECTED AND QUALIFIES.
 
                                        6
<PAGE>   10
 
       PROPOSAL 2: AMENDMENT OF THE 1997 STOCK OPTION AND INCENTIVE PLAN
 
GENERAL
 
     In January 1997, the Company adopted The 1997 Stock Option and Incentive
Plan of Kilroy Realty Corporation, Kilroy Realty, L.P., and Kilroy Services,
Inc. (the "Services Company") (the "Stock Incentive Plan") to enable executive
officers, key employees and directors of the Company, the Operating Partnership
and the Services Company to participate in the ownership of the Company. The
Stock Incentive Plan is designed to attract and retain executive officers, other
key employees and directors of the Company, the Operating Partnership and the
Services Company and to provide incentives to such persons to maximize the
Company's cash flow available for distribution. The Stock Incentive Plan
consists of four separate and distinct plans, one for the benefit of executive
officers, employees, consultants and directors of the Company, one for the
benefit of employees and consultants of the Operating Partnership, one for the
benefit of employees, consultants and directors of the Services Company and one
with "incentive stock options," as defined in Section 422 of the Code, for the
benefit of the executive officers and employees of the Company (each subject to
the ownership limit contained in the Charter (the "Ownership Limit"), or such
other limit as provided in the Charter or as otherwise permitted by the Board).
The Stock Incentive Plan provides for the award of a broad variety of
stock-based compensation alternatives such as non-qualified stock options,
incentive stock options, restricted stock and stock appreciation rights.
 
     The Stock Incentive Plan is qualified under Rule 16b-3 under the Securities
Exchange Act of 1934, as amended (the "Exchange Act"). Stock options may be
granted in the form of "incentive stock options," as defined in Section 422 of
the Code, or non-statutory stock options and are exercisable for up to ten years
following the date of grant. The Stock Incentive Plan shall terminate ten years
from January 1997 unless sooner terminated by the Board.
 
     On March 17, 1998, the Board of Directors unanimously adopted, subject to
stockholder approval, the Stock Incentive Plan Amendment (i) to increase the
number of shares of Common Stock issuable under the plan to an amount equal to
8.9% of the Company's total issued and outstanding shares of Common Stock as of
May 12, 1998, and on each January 1, April 1, July 1 and October 1 thereafter to
increase the number of shares of Common Stock issuable under the plan to 8.9% of
number of shares of Common Stock issued and outstanding as of the last day of
the immediately preceding fiscal quarter, commencing July 1, 1998, (ii) to
increase the maximum number of shares of the Common Stock issuable under the
plan as "incentive stock options," as defined in Section 422 of the Code, to
2,330,000 shares of the Common Stock and (iii) to establish, as a separate and
distinct plan under the Stock Incentive Plan, the grant of a plan with incentive
stock options to the executive officers and employees of the Company.
 
     Under the terms of the Stock Incentive Plan, an amendment to the plan to
increase the maximum number of shares of Common Stock which may be issued
thereunder requires the approval of a majority of the Company's stockholders. If
approved by the Company's stockholders, the Stock Incentive Plan Amendment would
immediately increase the number of shares of Common Stock issuable under the
plan to 2,331,790 (assuming 26,199,888 shares of Common Stock are outstanding on
May 12, 1998, an amount equal to the number of shares of Common Stock issued and
outstanding on the date of this Proxy Statement) of which 933,790 will be
available for grant or award by the Executive Compensation Committee or, in the
absence thereof, the Board of Directors. As of the date of this Proxy Statement,
options covering 1,298,000 shares of Common Stock, and 100,000 restricted shares
of Common Stock, had been granted under the plan. To the extent the Company
issues additional shares of Common Stock prior to or on May 12, 1998, the
immediate increase in the number of shares of Common Stock issuable under the
Stock Incentive Plan would include a number of shares of Common Stock equal to
8.9% of the aggregate amount of such issued additional shares of Common Stock.
 
     The principal features of the proposed Stock Incentive Plan Amendment are
summarized below, but the summary is qualified in its entirety by reference to
the full text of such plan which can be obtained by making a written request to
the Company's Secretary. A copy of the proposed Stock Incentive Plan Amendment
is set forth as Exhibit A to this Proxy Statement.
 
                                        7
<PAGE>   11
 
ADMINISTRATION
 
     The Stock Incentive Plan is administered by the Executive Compensation
Committee or, in the absence thereof, the Board of Directors. No person is
eligible to serve on the Executive Compensation Committee unless such person is
then an Independent Director. The Executive Compensation Committee has complete
discretion to determine (subject to (i) the Ownership Limit and (ii) a limit
against granting options or stock appreciation rights for more than 300,000
shares to any person in any fiscal year) which eligible individuals are to
receive option or other stock grants, the number of shares subject to each such
grant, the status of any granted option as either an incentive option or a
non-qualified stock option under the federal tax laws, the exercise schedule to
be in effect for the grant, the maximum term for which any granted option is to
remain outstanding and subject to the specific terms of the Stock Incentive
Plan, any other terms of the grant.
 
     In addition to administering the Stock Incentive Plan, the Executive
Compensation Committee is also authorized to interpret the Stock Incentive Plan,
to adopt such rules for the administration, interpretation and application of
the Stock Incentive Plan as are consistent therewith and to interpret, amend or
revoke any such rules. In its absolute discretion, the Board may at any time and
from time to time exercise any and all rights and duties of the Executive
Compensation Committee under this Stock Incentive Plan except with respect to
matters which under Rule 16b-3 or Section 162(m) of the Code, or any regulations
or rules issued thereunder, are required to be determined in the sole discretion
of the Executive Compensation Committee.
 
     Members of the Executive Compensation Committee receive such compensation
for their services as may be determined by the Board. All expenses and
liabilities that the members of the Executive Compensation Committee incur in
connection with the administration of the Executive Compensation Committee shall
be borne by the Company. All actions taken and all determinations made by the
Executive Compensation Committee or the Board in good faith is final and binding
upon all optionees, grantees, the Company, the Operating Partnership and all
other interested persons. No member of the Executive Compensation Committee or
Board is personally liable for any action or determination made in good faith
with respect to the Stock Incentive Plan, options or awards of restricted stock,
and all members are fully protected by the Company in respect of any such action
or determination.
 
ELIGIBILITY
 
     All employees of the Company may, at the discretion of the Executive
Compensation Committee, be granted incentive and non-qualified stock options to
purchase shares of Common Stock at any exercise price not less than 100% of the
fair market value of such shares on the grant date. Directors of the Company,
employees of the Operating Partnership, employees and directors of the Services
Company, consultants and other persons who are not regular salaried employees of
the Company are not eligible to receive incentive stock options, but are
eligible to receive non-qualified stock options. In addition, all employees and
consultants of the Company, the Operating Partnership and the Services Company
are eligible for awards of restricted stock and grants of stock appreciation
rights.
 
NUMBER OF SHARES SUBJECT TO STOCK INCENTIVE PLAN
 
     The Company presently has reserved 1,500,000 shares of Common Stock for
issuance pursuant to the Stock Incentive Plan. As of the date of this Proxy
Statement, 100,000 of such shares have been issued as restricted shares, and
options covering 1,298,000 of such shares have been granted, under the Stock
Incentive Plan.
 
PURCHASE PRICE OF SHARES SUBJECT TO OPTIONS
 
     The price of the shares of Common Stock subject to each option shall be set
by the Executive Compensation Committee; provided, however, that the price per
share of an option shall be not less than 100% of the fair market value of such
shares on the date such option is granted; provided, further, that, in the case
of an incentive stock option, the price per share shall not be less than 110% of
the fair market value of such shares on the date such option is granted in the
case of any individual then owning (within the meaning of
 
                                        8
<PAGE>   12
 
Section 424(d) of the Code) more than ten percent of the total combined voting
power of all classes of stock of the Company, any subsidiary or any parent
corporation ("greater than 10% stockholders").
 
NON-ASSIGNABILITY
 
     Options may be transferred only by will or by the laws of descent and
distribution. During a participant's lifetime, options are exercisable only by
the participant. No option or interest or right therein or part thereof will be
liable for the debts, contracts, or engagements of the optionee or the
optionee's successors-in-interest or will be subject to disposition by transfer,
alienation, pledge, encumbrance assignment or any other means, whether
voluntary, involuntary or by operation of law.
 
TERMS AND EXERCISABILITY OF OPTIONS
 
     The term of an option shall be set by the Executive Compensation Committee
in its discretion; provided, however,that such term shall not be greater than
ten years from the date the option is granted; provided, further, that in the
case of incentive stock options, the term shall not be more than five years from
the date the incentive stock option is granted if such option is granted to a
greater than 10% stockholder. Unless as limited by the requirements of Section
422 of the Code and regulations and rulings thereunder applicable to incentive
stock options and the preceding sentence, the Executive Compensation Committee
may extend the term of any outstanding option in connection with any termination
of employment or consultancy, or amend any other term of condition of such
option relating to such a termination.
 
     Unless otherwise determined by the Board or the Executive Compensation
Committee, all options granted under the Stock Incentive Plan are subject to the
following conditions: (i) options will be exercisable in installments, on a
cumulative basis, at the rate of thirty-three and one-third percent (33 1/3%)
each year beginning on the first anniversary of the date of the grant of the
option, until the options expire or are terminated and (ii) following an
optionee's termination of employment, the optionee shall have the right to
exercise any outstanding vested options for a specified period. The optionee has
no stockholder rights with respect to the shares subject to his or her
outstanding options until such options are exercised and the purchase price is
paid for the shares.
 
     To the extent that the aggregate fair market value of stock with respect to
which "incentive stock options" (within the meaning of Section 422 of the Code,
but without regard to Section 422(d) of the Code) are exercisable for the first
time by an optionee during any calendar year (under the Stock Incentive Plan and
all other incentive stock option plans of the Company, any subsidiary and any
parent corporation) exceeds $100,000, such options shall be taxed as
non-qualified stock options. The rule set forth in the preceding sentence shall
be applied by taking options into account in the order in which they were
granted. For this purpose, the fair market value of stock shall be determined as
of the time that the option with respect to such stock is granted.
 
     Options are exercisable in whole or in part by written notice to the
Company, specifying the number of shares being purchased and accompanied by
payment of the purchase price of such shares. The options price may be paid (i)
in cash or by certified or cashier's check payable to the order of the Company,
(ii) by delivery of shares of Common Stock of the Company already owned by, and
in the possession of, the optionee or (iii) if authorized by the Board or the
Executive Compensation Committee or if specified in the option agreement for the
option being exercised, by a recourse promissory note made by the optionee in
favor of the Company or through installment payments to the Company.
 
     On the date the option price is to be paid, the optionee (or his or her
successor) must make full payment to the Company of all amounts that must be
withheld by the Company for federal, state or local tax purposes.
 
STOCK OPTION AGREEMENTS; CONSIDERATION TO THE COMPANY
 
     In consideration of the granting of a non-qualified stock option, the
person to whom such option is granted has agreed, in a written stock option
agreement (a "Stock Option Agreement"), to remain in the employ of, or act as a
consultant for, the Company, the Operating Partnership, the Services Company or
any
 
                                        9
<PAGE>   13
 
of their respective subsidiaries, for a period of at least one year after the
option is granted (or until the next annual meeting of the stockholders of the
Company, in the case of a director). Nothing in the Stock Incentive Plan or
Stock Option Agreement shall confer upon any optionee any right to (i) continue
in the employ of or consult for the Company, the Operating Partnership, the
Services Company or any of their respective subsidiaries, or as a director of
the Company or the Services Company or (ii) receive severance pay from the
Company, the Operating Partnership, the Services Company or any of their
respective subsidiaries.
 
TERMINATION OF EMPLOYMENT; DEATH OR PERMANENT DISABILITY
 
     If a holder of an option ceases to be employed by the Company for any
reason other than the optionee's death or permanent disability, such optionee's
stock option shall expire three months after the date of such cessation of
employment unless by its terms it expires sooner; provided, however, that during
such period after cessation of employment, such stock option may be exercised
only to the extent it was exercisable according to such option's terms on the
date of cessation of employment. If an optionee dies or becomes permanently
disabled while the optionee is employed by the Company, such optionee's option
shall expire 12 months after the date of such optionee's death or permanent
disability unless by its terms it expires sooner. During such period after
death, such stock option may, to the extent it remains unexercised upon the date
of such death, be exercised by the person or persons to whom the optionee's
rights under such stock option are transferred under the laws of descent and
distribution.
 
ACCELERATION OF EXERCISABILITY
 
     In the event that the Company is acquired by merger, consolidation or asset
sale, each outstanding option which is not to be assumed by the successor
corporation or replaced with a comparable option to purchase shares of the
capital stock of the successor corporation will, at the election of the Board
(or if so provided in an option or other agreement with an optionee),
automatically accelerate in full.
 
ADJUSTMENTS
 
     In the event any change is made to the Common Stock issuable under the
Stock Incentive Plan by reason of any recapitalization, stock dividend, stock
split, combination of shares, exchange of shares or other change in corporate
structure effected without the Company's receipt of consideration, appropriate
adjustment will be made to (i) the maximum number and class of shares issuable
under the Stock Incentive Plan and (ii) the number and/or class of shares and
price per share in effect under each outstanding option.
 
RESTRICTED STOCK
 
     Restricted stock may be sold to participants at various prices (but not
below par value) and is subject to such restrictions as may be determined by the
Executive Compensation Committee. Restricted stock, typically, may be
repurchased by the Company at the original purchase price if the conditions or
restrictions are not met. In general, restricted stock may not be sold, or
otherwise transferred or hypothecated, until restrictions are removed or expire.
Purchasers of restricted stock have voting rights and receive distributions
prior to the time when the restrictions lapse.
 
STOCK APPRECIATION RIGHTS
 
     A Stock Appreciation Right (a "SAR") may be granted to any director,
officer, employee or consultant of the Company who receives a grant of an option
under the Stock Incentive Plan. A SAR may be granted in connection and
simultaneously with the grant of an option or with respect to a previously
granted option. A SAR shall be subject to such terms and conditions not
inconsistent with the Stock Incentive Plan as the Executive Compensation
Committee shall impose.
 
AMENDMENTS TO THE STOCK INCENTIVE PLAN
 
     The Board may at any time suspend or terminate the Stock Incentive Plan.
The Board or Executive Compensation Committee may also at any time amend or
revise the terms of the Stock Incentive Plan;
                                       10
<PAGE>   14
 
provided that no such amendment or revision shall, unless appropriate
stockholder approval of such amendment or revision is obtained, (i) increase the
maximum number of shares of Common Stock which may be issued, granted or awarded
under the Stock Incentive Plan (except for adjustments as described in the
foregoing paragraph) or (ii) change the minimum purchase price per share of
Common Stock required under the Stock Incentive Plan.
 
TERMINATION
 
     The Stock Incentive Plan will terminate on January 31, 2007, unless sooner
terminated by the Board.
 
REGISTRATION STATEMENT ON FORM S-8.
 
     The Company has filed with the Securities and Exchange Commission (the
"Commission") a Registration Statement on Form S-8 covering the restricted
shares of Common Stock and the shares of Common Stock underlying options granted
under the Stock Incentive Plan. If the Stock Incentive Plan Amendment is
approved by the Company's stockholders, the Company will, as necessary, file
with the Commission registration statements on Form S-8 covering the
registration of additional shares of Common Stock underlying options granted and
restricted stock or Stock Appreciation Rights awarded under the Stock Incentive
Plan, as amended.
 
CONFORMITY TO SECURITIES LAWS
 
     The Stock Incentive Plan is intended to conform to the extent necessary
with all provision of the Securities Act of 1933, as amended ("Securities Act"),
and the Exchange Act and any and all regulations and rules promulgated by the
Commission thereunder, including, without limitation, Rule 16b-3. The Stock
Inventive Plan will be administered, and Options will be granted and may be
exercised, only in such a manner as to conform to such laws, rules and
regulations. To the extent permitted by applicable law, the Stock Incentive Plan
and options granted thereunder shall be deemed amended to the extent necessary
to conform to such laws, rules and regulations.
 
PROPOSED STOCK INCENTIVE PLAN AMENDMENT
 
     On March 17, 1998, the Board of Directors unanimously adopted, subject to
stockholder approval, the Stock Incentive Plan Amendment to increase the number
of shares of Common Stock issuable under the plan to an amount equal to 8.9% of
the Company's total issued and outstanding shares of Common Stock as of May 12,
1998, and on each January 1, April 1, July 1 and September 1 thereafter to
increase the number of shares of Common Stock issuable under the plan to 8.9% of
number of shares of Common Stock issued and outstanding as of the last day of
the immediately preceding fiscal quarter, commencing July 1, 1998.
 
     Under the terms of the Stock Incentive Plan, an amendment to the plan to
increase the maximum number of shares of Common Stock which may be issued
thereunder requires the approval of a majority of the Company's stockholders. If
approved by the Company's stockholders, the Stock Incentive Plan Amendment would
immediately increase the number of shares of Common Stock under the plan to
2,331,790 (assuming 26,199,888 shares of Common Stock are outstanding on May 12,
1998, an amount equal to the number of shares of Common Stock issued and
outstanding on the date of this Proxy Statement) of which 933,790 will be
available for grant or award by the Executive Compensation Committee or, in the
absence thereof, the Board of Directors. To the extent the Company issues
additional shares of Common Stock prior to or on May 12, 1998, the immediate
increase in the number of shares of Common Stock issuable under the Stock
Incentive Plan would include a number of shares of Common Stock equal to 8.9% of
the aggregate amount of such issued additional shares of Common Stock.
Thereafter, the number of shares issuable under the Stock Incentive Plan will be
increased on each January 1, April 1, July 1 and October 1, commencing July 1,
1998, to an amount equal to 8.9% of the then issued and outstanding shares of
Common Stock, without further approval by the Company's stockholders. The
maximum number of shares of Common Stock issuable under the Stock Incentive Plan
as "incentive stock options," as defined in Section 422 of the Code, will not
exceed 2,330,000 shares of Common Stock (representing approximately 8.9% of the
total issued and outstanding
 
                                       11
<PAGE>   15
 
shares of Common Stock as of March 17, 1998, the date the Stock Incentive Plan
Amendment was approved by the Board of Directors of the Company). Even if the
number of shares of outstanding Common Stock decrease during any quarter, the
number of shares of Common Stock available under the Stock Incentive Plan will
not be decreased under this provision. As of the date of this Proxy Statement,
options covering 1,298,000 shares of Common Stock, and 100,000 restricted shares
of Common Stock, had been granted under the plan.
 
     The Board believes that increasing the number of shares available for
issuance under the Stock Incentive Plan will give the Executive Compensation
Committee and the Board greater flexibility to carry out its responsibilities to
(i) establish compensation programs that attract, motivate and retain executive
and other key employees of the Company, (ii) make available additional shares
for grants to employees of companies which may be acquired and (iii) administer
such programs in a manner that benefits the long-term interest of the Company
and its stockholders.
 
VOTE REQUIRED
 
     The affirmative vote of a majority of shares of Common Stock represented in
person or by proxy and entitled to vote at the Annual Meeting is required for
approval of the Stock Incentive Plan Amendment. THE BOARD RECOMMENDS THAT
STOCKHOLDERS VOTE FOR APPROVAL OF THE STOCK INCENTIVE PLAN AMENDMENT.
 
                                       12
<PAGE>   16
 
                      CERTAIN INFORMATION WITH RESPECT TO
                         EXECUTIVE AND SENIOR OFFICERS
 
     The following table sets forth certain current information with respect to
the executive officers of the Company:
 
<TABLE>
<CAPTION>
                NAME                   AGE                       POSITION
                ----                   ---                       --------
<S>                                    <C>    <C>
John B. Kilroy, Sr...................  75     Chairman of the Board
                                              President, Chief Executive Officer and
John B. Kilroy, Jr...................  49     Director
Steven L. Black......................  44     Executive Vice President, San Diego
Campbell Hugh Greenup................  44     Executive Vice President, Los Angeles
                                              Executive Vice President and Chief Operating
Jeffrey C. Hawken....................  39     Officer
                                              Executive Vice President, Chief Financial
Richard E. Moran Jr..................  46     Officer
T. Patrick Smith.....................  49     Executive Vice President, Orange County
Tyler H. Rose........................  37     Senior Vice President and Treasurer
</TABLE>
 
     The following is a biographical summary of the experience of the executive
and senior officers of the Company:
 
     JOHN B. KILROY, SR. has served as Chairman of the Board since its
incorporation in September 1996. Biographical information regarding Mr. Kilroy
is set forth under "Proposal 1: Election of Directors -- Directors Continuing in
Office."
 
     JOHN B. KILROY, JR. has served as the President and Chief Executive
Officer. Biographical information regarding Mr. Kilroy is set forth under
"Proposal 1: Election of Directors -- Directors Continuing in Office."
 
     STEVEN L. BLACK, age 44, has served as Executive Vice President since
November 1997. Mr. Black joined the Company from TAG, where he was an equity
owner and served as president since January 1994, overseeing its activities in
real estate development and investment. From January 1988 to December 1993, Mr.
Black operated his own real estate development and management company,
Centremark, where he developed residential, commercial and industrial property.
Prior to 1988, Mr. Black was president of The Sickels Group of San Diego
directing its development of residential, commercial and industrial space. Mr.
Black also practiced public accounting with Deloitte & Touche LLP. Mr. Black is
a member of the Urban Land Institute, a board member of both the National
Association of Industrial and Office Parks and a board member of the Building
Industry Association.
 
     CAMPBELL HUGH GREENUP, age 44, is currently an Executive Vice President of
the Company and has been with the Company since it commenced operations in
January 1997. Prior to that time, Mr. Greenup was employed at KI since 1986 as
Assistant General Counsel and had responsibility for a significant portion of
its legal affairs, including transaction negotiation and documentation. In
addition, he was responsible for all of KI's development activities, including
land acquisition and entitlement, project development, leasing and disposition.
In this role, he was also President of Kilroy Technologies Company, LLC and
directed all of KI's fee development activities. Mr. Greenup is a member of the
American Bar Association, the Urban Land Institute, the National Association of
Corporate Real Estate Executives and the Los Angeles County Beach Advisory
Commission.
 
     JEFFREY C. HAWKEN, age 39, has served as the Executive Vice President and
Chief Operating Officer of the Company since it commenced operations in January
1997. Prior to that time, Mr. Hawken served in the same capacity for KI and was
responsible for the management and operations of KI's real estate portfolio. Mr.
Hawken's activities have included leasing, asset and facility management,
operational cost reduction and code compliance. He has also served on KI's
acquisitions and executive committees. Mr. Hawken joined KI in 1980, as a Senior
Financial Analyst, and has been involved in property and asset management with
the Company since May 1983. Mr. Hawken holds a Bachelor of Science degree in
Business Administration from the University of Southern California. Since that
time, he attained the designation of Real Property Administrator through the
Building Owner's and Manager's Association.
 
                                       13
<PAGE>   17
 
     RICHARD E. MORAN JR., age 46, has served as Executive Vice President, Chief
Financial Officer and Secretary of the Company since December 1996. Prior to
that time, Mr. Moran was Executive Vice President, Chief Financial Officer and
Secretary of Irvine Apartment Communities, Inc. from 1993 to 1996. Mr. Moran was
affiliated with The Irvine Company from 1977 to 1993. He served as Treasurer of
The Irvine Company from 1983 to 1993, was named Vice President in 1984, Senior
Vice President in 1990, and Executive Vice President, Corporate Finance in 1992.
Previously, he was a certified public accountant with Coopers & Lybrand LLP. He
is a member of the Urban Land Institute. Mr. Moran received his Master of
Business Administration degree from the Harvard University Graduate School of
Business Administration and his undergraduate degree from Boston College.
 
     T. PATRICK SMITH, age 49, has served as Executive Vice President of the
Company since November 1997. Mr. Smith joined Kilroy Realty Corporation from TAG
where he served since 1996 as a principal and equity owner. From September 1995
to September 1996, Mr. Smith was employed by MGM Grand, Inc. as president of the
real estate division. From 1993 to 1994, Mr. Smith was President and Chief
Executive Officer of Irvine Apartment Communities. Prior to joining Irvine
Apartment Communities, Mr. Smith was employed by The Irvine Company for six
years beginning in 1987 as president of Irvine Pacific, the residential property
development division. Mr. Smith is a member of the Urban Land Institute, Young
President's Organization and a member of the Board of Regents of Loyola
Marymount University since 1987, from which he holds a Bachelor of Business
Administration.
 
     TYLER H. ROSE, age 37, was appointed Senior Vice President and Treasurer of
the Company in March 1997. Mr. Rose was Senior Vice President, Corporate Finance
of Irvine Apartment Communities, Inc. from February 1995 to March 1997, and was
appointed Treasurer in 1996. Prior to that, Mr. Rose was Vice President,
Corporate Finance of The Irvine Company from January 1994 to February 1995. From
1986 to 1994, Mr. Rose was employed at J.P. Morgan & Co., serving in its Real
Estate Corporate Finance Group until 1992 and as Vice President of its Australia
Mergers and Acquisitions Group from 1992 to 1994. Mr. Rose also served for two
years as a financial analyst for General Electric Company. Mr. Rose holds a
degree of Master of Business Administration from The University of Chicago
Graduate School of Business and a Bachelor of Arts degree in Economics from the
University of California, Berkeley.
 
                                       14
<PAGE>   18
 
                             EXECUTIVE COMPENSATION
 
     The following table sets forth the salary rates and other compensation paid
for the period of January 31, 1997 through December 31, 1997 to the Chief
Executive Officer and each of the Company's other executive officers who earned
total salary and bonus for the year ended December 31, 1997 in excess of
$100,000 (the "Named Executive Officers"). The Company has entered into
employment agreements with each of its executive officers as described below.
See "Employment Agreements."
 
<TABLE>
<CAPTION>
                                                         ANNUAL                            LONG-TERM
                                                      COMPENSATION                        COMPENSATION
                                       ------------------------------------------   ------------------------
                                                                                                  SECURITIES
                                                                                                  UNDERLYING
                                                                                    RESTRICTED     OPTIONS
                                                                   OTHER ANNUAL        STOCK       GRANTED
 NAME AND PRINCIPAL POSITION    YEAR   SALARY($)    BONUS($)(1)   COMPENSATION($)   AWARD(S)(2)   IN 1997(3)
 ---------------------------    ----   ---------    -----------   ---------------   -----------   ----------
<S>                             <C>    <C>          <C>           <C>               <C>           <C>
John B. Kilroy, Jr............  1997   $180,769(4)   $200,000                (6)            --     250,000
  Director, President and
  Chief Executive Officer
Jeffrey C. Hawken.............  1997   $158,173(4)   $200,000                (6)            --     150,000
  Executive Vice President and
  Chief Operating Officer
Richard E. Moran Jr...........  1997   $180,769(4)   $200,000(7)             (6)    $2,299,000     150,000
  Executive Vice President,
  Chief Financial Officer and
  Secretary
Campbell Hugh Greenup.........  1997   $149,135(4)   $200,000                (6)            --     100,000
  Executive Vice President
Tyler H. Rose.................  1997   $129,231(5)   $160,000                (6)            --     150,000
  Senior Vice President and
  Treasurer
</TABLE>
 
- ---------------
(1) The amount of any such bonus has been determined by the Executive
    Compensation Committee of the Board of Directors. On March 9, 1998, the
    Executive Compensation Committee approved and authorized amendments to the
    employment agreements for the executive officers of the Company providing
    for total annual executive incentive compensation, including annual bonuses,
    commencing with fiscal year ended December 31, 1997 to be awarded to the
    executive officers of the Company at the discretion of the Executive
    Compensation Committee.
 
(2) Pursuant to Mr. Moran's employment agreement, concurrent with the
    consummation of the IPO, he received 100,000 restricted shares of Common
    Stock under the Stock Incentive Plan with an aggregate value at January 31,
    1997, the date of issuance, of $2.3 million against the payment of $1,000
    therefor. The restricted shares of Common Stock vest in equal annual
    installments pro rata over a five-year period, subject to certain
    acceleration provisions. Mr. Moran is entitled to receive distributions in
    respect of such restricted stock.
 
(3) Options to purchase an aggregate of 1,298,000 shares of Common Stock have
    been granted to directors, executive officers and other employees of the
    Company as of the date of this Proxy Statement. Such options vest pro rata
    in annual installments over a three-year period. An additional 102,000
    shares of Common Stock are reserved for issuance under the Stock Incentive
    Plan, as of the date of this Proxy Statement.
 
(4) The salary, which was paid to the Named Executive Officer during the fiscal
    year ended December 31, 1997, commenced on February 1, 1997.
 
(5) The salary, which was paid to the Named Executive Officer during the fiscal
    year ended December 31, 1997, commenced on March 10, 1997.
 
                                       15
<PAGE>   19
 
(6) In addition, Mr. Moran was paid a bonus of $200,000 upon consummation of the
    initial public offering on January 31, 1997 (the "IPO") which was an
    obligation of, and was paid by, the principals of KI.
 
(7) The aggregate amount of the perquisites and other personal benefits,
    securities or property for each Named Executive Officer is less than the
    lesser of $50,000 or 10% of the total 1997 salary and bonus for such Named
    Executive Officer.
 
OPTION GRANTS IN LAST FISCAL YEAR
 
     The following table shows certain information relating to options to
purchase shares of Common Stock granted to the Named Executive Officers during
1997.
 
<TABLE>
<CAPTION>
                                                       INDIVIDUAL GRANTS(1)
                                               -------------------------------------
                                                PERCENT OF                              POTENTIAL REALIZABLE
                            NUMBER OF SHARES      TOTAL                                VALUE AT ASSUMED ANNUAL
                            OF COMMON STOCK      OPTIONS                                RATES OF SHARE PRICE
                               UNDERLYING       GRANTED TO    EXERCISE                      FOR OPTION(2)
                                OPTIONS        EMPLOYEES IN   PRICE PER   EXPIRATION   -----------------------
           NAME                GRANTED(#)      FISCAL YEAR      SHARE        DATE          5%          10%
           ----             ----------------   ------------   ---------   ----------   ----------   ----------
<S>                         <C>                <C>            <C>         <C>          <C>          <C>
John B. Kilroy, Jr........      250,000            21.8%       $23.00      1/31/07     $2,178,644   $7,726,519
Jeffrey C. Hawken.........      150,000            13.1%        23.00      1/31/07      1,307,186    4,635,911
Richard E. Moran Jr.......      150,000            13.1%        23.00      1/31/07      1,307,186    4,635,911
Campbell Hugh Greenup.....      100,000             8.7%        23.00      1/31/07        871,458    3,090,607
Tyler H. Rose.............      150,000            13.1%        25.00      5/12/07      1,795,855    5,414,034
</TABLE>
 
- ---------------
(1) All options granted in 1997 become exercisable in three equal installments
    beginning on the first anniversary of the date of grant and have a term of
    ten years subject to earlier termination in certain events related to
    termination of employment. The option exercise price is equal to the fair
    market value of the Common Stock on the date of grant.
 
(2) Assumed annual rates of stock price appreciation for illustrative purposes
    only. Actual stock prices will vary from time to time based upon market
    factors and the Company's financial performance. No assurances can be given
    that these appreciation rates will be achieved.
 
AGGREGATED OPTION EXERCISES IN LAST FISCAL YEAR AND FISCAL YEAR-END OPTION
VALUES
 
     The following table sets forth certain information concerning exercised and
unexercised options held by the Named Executive Officers at December 31, 1997.
 
<TABLE>
<CAPTION>
                                                               NUMBER OF SECURITIES            VALUE OF UNEXERCISED
                                                                    UNDERLYING                     IN-THE-MONEY
                                                              UNEXERCISED OPTIONS AT                OPTIONS AT
                                                 VALUE           DECEMBER 31, 1997              DECEMBER 31, 1997
                         SHARES ACQUIRED ON    REALIZED     ---------------------------   ------------------------------
         NAME               EXERCISE(#)           ($)       EXERCISABLE   UNEXERCISABLE   EXERCISABLE   UNEXERCISABLE(1)
         ----            ------------------   -----------   -----------   -------------   -----------   ----------------
<S>                      <C>                  <C>           <C>           <C>             <C>           <C>
John B. Kilroy, Jr.....         --                N/A           --          250,000           --           $1,437,500
Jeffrey C. Hawken......         --                N/A           --          150,000           --              862,500
Richard E. Moran Jr....         --                N/A           --          150,000           --              862,500
Campbell Hugh Greenup..         --                N/A           --          100,000           --              575,000
Tyler H. Rose..........         --                N/A           --          150,000           --              562,500
</TABLE>
 
- ---------------
(1) Based on closing price of $28 3/4 per share of Common Stock on December 31,
    1997, as reported by the New York Stock Exchange.
 
401(k) PLAN
 
     Effective November 1, 1997, the Company established its Section 401(k)
Savings/Retirement Plan (the "401(k) Plan") to cover eligible employees of the
Company and any designated affiliate.
 
     The 401(k) Plan permits eligible employees of the Company to defer up to
20% of their annual compensation, subject to certain limitations imposed by the
Internal Revenue Code (the "Code"). The
 
                                       16
<PAGE>   20
 
employees' elective deferrals are immediately vested and non-forfeitable upon
contributions to the 401(k) Plan. The Company currently makes matching
contributions to the 401(k) Plan in an amount equal to fifty-cents for each one
dollar of participant contributions up to a maximum of five percent of the
participant's annual salary up to certain limits. Participants vest immediately
in the amounts contributed by the Company. Employees of the Company are eligible
to participate in the 401(k) Plan if they meet certain requirements concerning
minimum period of credited service. For the year ended December 31, 1997, the
Company's contribution to the 401(k) Plan was $28,000.
 
     The 401(k) Plan qualifies under Section 401 of the Code so that
contributions by employees to the 401(k) Plan, and income earned on plan
contributions, are not taxable to employees until withdrawn from the 401(k)
Plan.
 
EMPLOYMENT AGREEMENTS
 
     Each of John B. Kilroy, Jr., Jeffrey C. Hawken, Richard E. Moran Jr.,
Campbell Hugh Greenup and Tyler H. Rose have entered into an employment
agreement with the Company which became effective on January 31, 1997 or, in the
case of Mr. Rose, the respective commencement of his employment. The employment
agreements have an initial term of three years and are subject to automatic
one-year extensions following the expiration of the initial term. On March 8,
1998, the Executive Compensation Committee approved amendments to the employment
agreements effective for the year ended December 31, 1997 to provide for annual
base compensation with the amount of any bonus to be determined at the
discretion of the Executive Compensation Committee. Prior to such amendments,
annual bonuses were limited to 100% of base compensation. Under the terms of his
employment agreement, Mr. Moran was paid a bonus of $200,000 on January 31,
1997. Mr. Moran's bonus was an obligation of, and was paid by, the principals of
KI.
 
     The employment agreements entitle the executives to participate in the
Company's Stock Incentive Plan and to receive certain other insurance benefits.
The employment agreements also provide that in the event of death, the
executive's estate will receive monthly payments of the executive's annual
salary, plus one-twelfth of any bonus to be received, for a period equal to the
lesser of the term remaining under the employment agreement or one year. In
addition, in the event of a termination by the Company without "cause," a
termination of employment resulting from "disability," a termination by the
executive for "good reason," or, in the case of Mr. Kilroy and Mr. Moran, a
termination pursuant to a "change of control" of the Company (as such terms are
defined in the respective employment agreements) the terminated executive will
be entitled to (i) severance (the "Severance Amount") and (ii) continued receipt
of certain benefits including medical insurance, life and disability insurance
and the receipt of other customary benefits established by the Company for its
executive employees for two years following the date of termination
(collectively, the "Severance Benefits"). The Severance Amount is equal to the
sum of two times the executive's average annual base compensation and two times
the highest annual bonus received during the preceding 36-month period.
 
     Under the employment agreements, "Disability" means a physical or mental
disability or infirmity which, in the opinion of a physician selected by the
Board, renders the executive unable to perform his duties for six consecutive
months or for shorter periods aggregating 180 business days in any 12-month
period (but only to the extent that such definition does not violate the
Americans with Disabilities Act). "Cause," as defined under the terms of the
respective employment agreements, means (i) the executive's conviction for
commission of a felony or a crime involving moral turpitude, (ii) the
executive's willful commission of any act of theft, embezzlement or
misappropriation against the Company or (iii) the executive's willful and
continued failure to substantially perform the executive's duties (other than
such failure resulting from the executive's incapacity due to physical or mental
illness), which is not remedied within a reasonable time. "Good reason" means
(i) the Company's material breach of any of its obligations under the employment
agreement (subject to certain notice and cure provisions) or (ii) any removal of
the executive from one or more of the appointed offices or any material
alteration or diminution in the executive's authority, duties or
responsibilities, without "cause" and without the executive's prior written
consent. "Change of Control" means (i) the event by which the individuals
constituting the Board as of the date of the Company's initial public offering
of shares of Common Stock (the "IPO") cease for any reason to constitute at
least a majority of the Company's Board; provided, however, that if the
election, or nomination for election by the Company's stockholders of any new
                                       17
<PAGE>   21
 
director was approved by a vote of at least a majority of the members of the
original Board of Directors, such new director shall be considered a member of
the original Board of Directors; (ii) an acquisition of any voting securities of
the Company by any "person" (as the term "person" is used for purposes of
Section 13(d) or Section 14(d) of the Exchange Act, immediately after which such
person has "beneficial ownership" (within the meaning of Rule 13d-3 promulgated
under the Exchange Act) of 20% or more of the combined voting power of the
Company's then outstanding voting securities unless such acquisition was
approved by a vote of at least one more than a majority of the original Board of
Directors; or (iii) approval by the stockholders of the Company of (a) a merger,
consolidation, share exchange or reorganization involving the Company, unless
the stockholders of the Company, immediately before such merger, consolidation,
share exchange or reorganization, own, directly or indirectly immediately
following such merger, consolidation, share exchange or reorganization, at least
80% of the combined voting power of the outstanding voting securities of the
corporation that is the successor in such merger, consolidation, share exchange
or reorganization in substantially the same proportion as their ownership of the
voting securities immediately before such merger, consolidation, share exchange
or reorganization; (b) a complete liquidation or dissolution of the Company; or
(c) an agreement for the sale or other disposition of all or substantially all
of the assets of the Company.
 
EXECUTIVE COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
     There are no Executive Compensation Committee interlocks and no employees
of the Company participate on the Executive Compensation Committee.
 
     The following report and the Stock Performance Graph shall be deemed not to
be incorporated by reference to any general statement incorporating by reference
this proxy statement into any filings under the Securities Act or the Exchange
Act, except to the extent that the Company specifically incorporates this
information by reference and shall not otherwise be deemed filed under such
Acts.
 
EXECUTIVE COMPENSATION COMMITTEE REPORT ON EXECUTIVE COMPENSATION
 
     Payment of cash compensation to the executive officers of the Company began
in February 1997. The base salary paid to the Company's executive officers
during 1997, and the stock options granted to the executive officers and
employees, was determined prior to that time by Messrs. Kilroy, Sr. and Kilroy,
Jr., the then-current directors and officers of the predecessors of the Company.
In making these determinations, Messrs. Kilroy, Sr. and Kilroy, Jr. considered
job responsibilities and the salaries paid to such executive officers of other
REITs similar to the Company, as well as the salaries paid to and past
performance of such person in their prior capacities at KI or elsewhere. The
cash bonuses awarded to the Company's executive officers for the year ended
December 31, 1997 were determined by the Executive Compensation Committee based
upon the Company's performance for such period, including its results from
operations and acquisition activity, and by reference to an independent
compensation survey of other real estate investment trusts.
 
     For 1998 and future years, the Company's Executive Compensation Committee
plans to build on the traditional compensation policies of KI, adapted to the
Company's competitive environment of similar publicly-traded REITs. The Company
has adopted the Stock Incentive Plan, which authorizes the Executive
Compensation Committee to grant stock options, stock appreciation rights,
restricted stock and other awards to the executive officers and other employees
of the Company, the Operating Partnership and the Services Company (as
hereinafter defined) (see "PROPOSAL 2: Amendment of the Stock Incentive Plan").
Through these plans and other means, the Executive Compensation Committee
intends to maintain strong links between executive officers compensation and
corporate and individual performance.
 
     It is the Executive Compensation Committee's intention that, so long as it
is consistent with the Company's overall compensation objectives, all executive
compensation be deductible for federal income tax purposes. Section 162(m) of
the Code limits the tax deduction for compensation paid to the Company's Chief
 
                                       18
<PAGE>   22
 
Executive Officer and the additional four most highly compensated officers who
are employed at fiscal year end to $1.0 million per year, unless certain
requirements are met.
 
                                          Executive Compensation Committee
 
                                          William P. Dickey
                                          Dale F. Kinsella
Date: March 9, 1998
 
                                       19
<PAGE>   23
 
PERFORMANCE GRAPH
 
     As a part of the rules concerning executive compensation disclosure, the
Company is obligated to provide a chart comparing the yearly percentage change
in the cumulative total stockholder return on the Company's Common Stock over a
five-year period. However, since the Company's Common Stock has been publicly
traded only since January 28, 1997, such information is provided from that date
through December 31, 1997.
 
     The following line graph compares the change in the Company's cumulative
stockholder return on its shares of Common Stock to the cumulative total return
of the Standard & Poor's 500 Stock Index ("S&P 500 Index") and the NAREIT Equity
REIT Total Return Index ("NAREIT Index") from January 31, 1997, the closing date
of the Company's initial public offering, to December 31, 1997. The line graph
starts at January 28, 1997, the date that the Company's shares of Common Stock
commenced trading on the New York Stock Exchange; however, the beginning value
of each of the NAREIT Equity Index and the S&P 500 Index is as of January 31,
1998, as each index is calculated only on a monthly basis. The graph assumes the
investment of $100 in the Company and each of the indices on January 28, 1997
and as required by the Commission, the reinvestment of all distributions. The
return shown on the graph is not necessarily indicative of future performance.
 
<TABLE>
<CAPTION>
        Measurement Period                                  NAREIT Equity       S&P 500 Index
      (Fiscal Year Covered)         Kilroy Realty Corp.       Index (1)              (1)
<S>                                 <C>                   <C>                 <C>
1/28/97                                    100.00              100.00              100.00
3/31/97                                    115.91               99.58               96.64
6/30/97                                    112.66              104.54              113.51
9/30/97                                    122.26              116.89              122.02
12/31/97                                   131.96              118.93              125.52
</TABLE>
 
(1) Beginning value of each of the NAREIT Equity Index and the S&P 500 Index is
    as of January 31, 1998, as each index is calculated only on a monthly basis.
 
                                       20
<PAGE>   24
 
                             PRINCIPAL STOCKHOLDERS
 
     The following table sets forth certain information, as of December 31,
1997, regarding the beneficial ownership of Common Stock (or Common Stock for
which limited partnership interests in the Operating Partnership (the "Units")
are exchangeable beginning on January 31, 1999) for (i) each person known by the
Company to be the beneficial owner of five percent or more of the Company's
outstanding Common Stock (or common stock for which the Units are exchangeable),
(ii) each director and each Named Executive Officer and (iii) the directors and
such Named Executive Officers of the Company as a group. Except as indicated
below, all of such Common Stock is owned directly, and the indicated person has
sole voting and investment power with respect to all of the shares of Common
Stock beneficially owned by such person. The Company has relied upon information
supplied by its officers, directors and certain stockholders and upon
information contained in filings with the Commission.
 
<TABLE>
<CAPTION>
                                                                       PERCENTAGE OF
                                               NUMBER OF SHARES OF   OUTSTANDING SHARES
         NAME OF BENEFICIAL OWNER(1)           BENEFICIALLY OWNED    OF COMMON STOCK(2)
         ---------------------------           -------------------   ------------------
<S>                                            <C>                   <C>
John B. Kilroy, Sr...........................      1,258,926(3)              4.5%
John B. Kilroy, Jr...........................      1,337,859(4)              4.7%
Jeffrey C. Hawken............................         50,000(5)                *
Richard E. Moran Jr..........................        150,000(6)                *
Campbell Hugh Greenup........................         33,333(7)                *
Tyler H. Rose................................          1,000(8)                *
Richard S. Allen.............................        254,022(9)                *
John R. D'Eathe..............................               --                --
William P. Dickey............................         5,333(10)                *
Matthew J. Hart..............................         8,333(11)                *
Dale F. Kinsella.............................         3,333(12)                *
European Investors Incorporated..............     1,916,500(13)              6.8%
All directors and executive officers as a            3,102,139              11.0%
  group (11 persons).........................
</TABLE>
 
- ---------------
* Represents less than 1.0% of outstanding shares of Common Stock.
 
 (1) Unless otherwise indicated, the address for each of the persons listed is
     c/o Kilroy Realty Corporation, 2250 East Imperial Highway, Suite 1200, El
     Segundo, CA 90245.
 
 (2) Assumes the exchange of 3,406,212 common limited partnership Units
     outstanding as of December 31, 1997 into shares of Common Stock on a
     one-for-one basis and includes only shares of Common Stock subject to
     options held by such beneficial owner that are exercisable within 60 days
     of the Record Date. The total number of shares outstanding used in
     calculating this percentage excludes the number of shares of Common Stock
     subject to options held by other persons that are exercisable within 60
     days of the Record Date.
 
 (3) Includes (i) 5,000 shares of Common Stock issuable upon the exercise of
     options exercisable within 60 days of December 31, 1997 and (ii) 1,253,926
     shares of Common Stock issuable beginning January 31, 1999 upon the
     exchange of common limited partnership Units of the Operating Partnership
     (including Units beneficially owned by KI and Kilroy Technologies Company,
     LLC, a California limited liability company ("Kilroy Technologies"), and
     allocated to Mr. Kilroy as one of its two shareholders).
 
 (4) Includes (i) 83,333 shares of Common Stock issuable upon the exercise of
     options exercisable within 60 days of December 31, 1997, (ii) 1,253,926
     shares of Common Stock issuable beginning January 31, 1999 upon the
     exchange of common limited partnership Units of the Operating Partnership
     (including Units beneficially owned by KI and Kilroy Technologies, and
     allocated to Mr. Kilroy as one of its two shareholders) and (iii) 600
     shares of Common Stock beneficially owned by Mr. Kilroy.
 
                                       21
<PAGE>   25
 
 (5) Includes 50,000 shares of Common Stock issuable upon the exercise of
     options within 60 days of December 31, 1997.
 
 (6) Includes (i) 50,000 shares of Common Stock issuable upon the exercise of
     options exercisable within 60 days of December 31, 1997 and (ii) 100,000
     restricted shares of Common Stock granted under the Stock Incentive Plan
     pursuant to the terms of Mr. Moran's employment agreement, which shares of
     Common Stock vest in five equal annual installments over a five-year
     period.
 
 (7) Includes 33,333 shares of Common Stock issuable upon the exercise of
     options exercisable within 60 days of December 31, 1997.
 
 (8) Represents 1,000 shares of Common Stock beneficially owned by Tyler H.
     Rose.
 
 (9) Includes 254,022 shares of Common Stock issuable beginning on January 31,
     1999 upon the exchange of common limited partnership Units of the Operating
     Partnership and beneficially owned directly or through TAG and its
     affiliates.
 
(10) Includes (i) 3,333 shares of Common Stock issuable upon the exercise of
     options exercisable within 60 days as of December 31, 1997 and (ii) 2,000
     shares of Common Stock beneficially owned by Mr. Dickey.
 
(11) Includes (i) 3,333 shares of Common Stock issuable upon the exercise of
     options exercisable within 60 days as of December 31, 1997 and (ii) 5,000
     shares of Common Stock beneficially owned by Mr. Hart.
 
(12) Includes 3,333 shares of Common Stock issuable upon the exercise of options
     exercisable within 60 days as of December 31, 1997.
 
(13) Based on information provided in a Schedule 13G filed on February 13, 1997
     by European Investors Incorporated ("EII") and EII Realty Securities
     Incorporated ("ERS"), a wholly-owned subsidiary of EII. As of December 31,
     1997 (i) EII had sole voting power with respect to 266,400 shares of Common
     Stock, shared voting power with respect to 298,100 shares of Common Stock,
     sole dispositive power with respect to 287,300 shares of Common Stock and
     shared dispositive power with respect to 277,200 shares of Common Stock;
     and (ii) ERS had sole voting power with respect to 1,126,000 shares of
     Common Stock and shared dispositive power with respect to 1,350,200 shares
     of Common Stock. The address for EII is 667 Madison Avenue, 16th Floor, New
     York, New York 10021-8041.
 
                 CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
 
     Certain directors and executive officers of the Company, including John B.
Kilroy, Sr. and John B. Kilroy, Jr., the Chairman of the Board and its President
and Chief Executive Officer, respectively, (or members of their immediate
families) and persons who will hold more than 5% of the outstanding shares of
Common Stock (or interests exchangeable therefor) have direct or indirect
interests in transactions with by the Company, the Operating Partnership or the
Services Company, including the transfer of certain properties to the Operating
Partnership by the holders of Units (the "Unitholders") in connection with the
certain formation transactions (the "Formation Transactions") on January 31,
1997, the grant of options with respect to certain properties (the "Option
Properties") and, if exercised, the purchase by the Company of one or more of
the Option Properties from the respective Unitholders, the repayment of certain
indebtedness encumbering the properties contributed by the Company's
predecessors to the Operating Partnership in connection with the Formation
Transactions and the performance of management and leasing activities by the
Operating Partnership and certain development and other activities by the
Services Company at the Option Properties. In addition, John B. Kilroy, Sr.
contributed $1,000 to the Company in exchange for an aggregate of 50 shares of
Common Stock which were subsequently repurchased by the Company, and on January
31, 1997, John B. Kilroy, Jr. and John B. Kilroy, Sr. each contributed cash to
the Services Company, which represents a 5.0% economic interest in the Services
Company.
 
                                       22
<PAGE>   26
 
PARTNERSHIP AGREEMENT
 
     On January 31, 1997, the Company entered into the Partnership Agreement of
the Operating Partnership with the various limited partners of the Operating
Partnership. John B. Kilroy, Sr. and John B. Kilroy, Jr., who are limited
partners of the Operating Partnership, are directors and/or officers of the
Company.
 
VARIOUS SERVICES PROVIDED BY THE SERVICES COMPANY TO THE KILROY GROUP
 
     Pursuant to management agreements, the Operating Partnership is providing
management and leasing services, and the Services Company is providing
development services, with respect to the Option Properties, each of which is
beneficially owned and controlled by John B. Kilroy, Sr. and John B. Kilroy, Jr.
During 1997, in connection with the management and leasing services provided by
the Operating Partnership for the Kilroy Airport Imperial Co. properties,
Messrs. Kilroy, Sr. and Kilroy, Jr. paid to the Operating Partnership fees in
the aggregate amount of $140,000, which the Company believes are equivalent to
the fair market value for such services provided. In addition, during 1997, in
connection with the development services provided by the Services Company with
respect to the properties located at Calabasas Park Centre, in Calabasas,
California, Messrs. Kilroy, Sr. and Kilroy, Jr. paid to the Services Company
fees in the aggregate amount of $183,333, which the Company believes are
equivalent to the fair market value for such services provided.
 
OPTIONS TO PURCHASE CERTAIN PROPERTIES
 
     In connection with the formation of the Company, the Company entered into
certain option agreements with partnerships controlled by John B. Kilroy, Sr.
and John B. Kilroy, Jr., the Chairman of the Board, and President, Chief
Executive Officer and Director, respectively, granting to the Operating
Partnership options to acquire (i) parcels comprising an aggregate of
approximately 18 acres located at Calabasas Park Centre, in Calabasas,
California and (ii) the three-building office complex located on North Sepulveda
Boulevard in El Segundo, California (the "Sepulveda Boulevard Office Complex")
at the respective purchase price for each of the properties as discussed below.
In January 1998, the Company exercised its option to acquire Calabasas Park
Centre, at a purchase price of $2,401,000, an amount equal to the total
accumulated costs, as of the date such option was exercised, in connection with
the acquisition of rights with respect to, and the entitlement and development
of the property, including, without limitation, property taxes, predevelopment
and entitlement costs and fees, and related bond financing costs. The exercise
of the option to acquire Calabasas Park Centre by the Company was unanimously
approved by the Company's Independent Directors. The Company presently expects
to complete the acquisition of Calabasas Park Centre in March 1998.
 
     The option for the Sepulveda Boulevard Office Complex is exercisable on or
before January 31, 2004. The Company has not exercised its option to purchase
the Sepulveda Boulevard Office Complex as of the date of this Proxy Statement.
The purchase price for each of the properties is payable in cash or Units at the
election of the seller. Pursuant to the terms of the applicable Option
Agreement, the purchase price for the Sepulveda Boulevard Office Complex is
equal to the sum of (i) the then outstanding mortgage indebtedness secured by
the respective properties, plus (ii) $1, plus (iii) the aggregate amount of
capital contributed by the beneficial owners of the property, net of actual cash
distributions distributed in respect of such beneficial owners, during the
period beginning on January 31, 1997 and ending on the date of exercise of the
option, plus (iv) an annualized return of 8.0% on the amount in excess of $5.0
million, if any, as determined pursuant to clause (iii) preceding. The Company's
option to purchase the Sepulveda Boulevard Office Complex is subject to a right
of first offer held by Hughes Space & Communications.
 
AGREEMENTS TO PURCHASE CERTAIN PROPERTIES
 
     On October 31, 1997, the Company entered into an agreement with TAG to
purchase through a series of transactions office and industrial buildings with
approximately 1,730,000 aggregate rentable square feet and develop approximately
750,000 square feet of office space for an aggregate purchase price of
approximately $300.0 million. The acquisition agreement with TAG was based on
arms-length negotiations. Subsequent to the execution of the related
documentation, Richard S. Allen, the majority equity owner and Chief Executive
Officer of TAG, was elected to serve as a director of the Company. As of
December 31, 1997, the Company
 
                                       23
<PAGE>   27
 
completed the first phase of the acquisitions from TAG by acquiring four office
and four industrial buildings encompassing 907,000 aggregate rentable square
feet for an aggregate purchase price of approximately $80.0 million.
 
     The second phase of the transaction is presently expected to consist of the
purchase of five office properties and three industrial properties located in
California and Nevada encompassing approximately 823,000 aggregate rentable
square feet and an estimated aggregate purchase price of approximately $120.0
million. The Company presently expects the acquisitions to occur during 1998,
pursuant to the completion of construction and/or stabilized occupancy of the
properties.
 
     The third phase of the transaction is presently expected to consist of the
development of two office projects in San Diego, California encompassing
approximately 750,000 aggregate rentable square feet for an estimated aggregate
development cost of $100.0 million. The Company has agreed to purchase a 50%
managing interest in the two projects upon completion of all necessary
entitlements and infrastructure and is expected to manage the development of
both projects. The Company has an option to purchase TAG's remaining interest in
both projects for a purchase price to be determined upon completion of the
projects. The Company presently expects development of the two office projects
to commence during the fourth quarter of 1998.
 
OTHER TRANSACTIONS
 
     In connection with the Formation Transactions, the Company incurred certain
expenses on behalf of KI, including the payment of $700,000 of interest in
connection with the repayment of an outstanding loan. All amounts payable to the
Company from KI have been paid in full. The highest amount of such receivables
outstanding during the period beginning February 1, 1997 through December 31,
1997 was approximately $1.3 million.
 
     In October 1997, the Services Company entered into a management agreement
to manage the development of certain properties owned by entities under common
control of Richard S. Allen, a director of the Company and a limited partner of
the Operating Partnership. At December 31, 1997, the Services Company had a
receivable balance of $250,000 for management fees earned during November and
December 1997. The fees were paid in January and February 1998. The Company
believes that the fees earned under the management agreement are at market
rates.
 
     In December 1997, the Company entered into an agreement to purchase certain
construction materials to be used in the development of office properties from a
partnership beneficially owned and controlled by Messrs. Kilroy, Sr. and Kilroy,
Jr. The purchase price to the Company for the materials was $3.0 million,
representing the lower of the cost to the partnership and the current market
price. The purchase of the construction materials by the Company was unanimously
approved by the Company's Independent Directors.
 
                    COMPLIANCE WITH FEDERAL SECURITIES LAWS
 
     Section 16(a) of the Exchange Act requires the Company's officers and
directors, and persons who own more than ten percent of a registered class of
the Company's equity securities (collectively, "Insiders"), to file with the
Commission initial reports of ownership and reports of changes in ownership of
the Company's Common Stock and other equity securities of the Company. Insiders
are required by regulation of the Commission to furnish the Company with copies
of all Section 16(a) forms they file.
 
     To the Company's knowledge, based solely on review of the copies of such
reports furnished to the Company or written representations that no other
reports were required, during the year ended December 31, 1997, all Insiders
complied with all Section 16(a) filing requirements applicable to them; except
that (i) the following Insiders were late with respect to the filing by each of
his or her Initial Statement of Beneficial Ownership of Securities on Form 3:
John B. Kilroy, Sr., John B. Kilroy, Jr., Jeffrey C. Hawken, Richard E. Moran
Jr., Campbell Hugh Greenup, Tyler H. Rose, Ann Marie Whitney, William P. Dickey,
Matthew J. Hart, Dale F. Kinsella and John R. D'Eathe; and (ii) the following
Insiders were late with respect to the filing
 
                                       24
<PAGE>   28
 
by each of his Statement of Changes in Beneficial Ownership on Form 4: John B.
Kilroy, Jr., William P. Dickey and Matthew J. Hart.
 
                 STOCKHOLDER PROPOSALS FOR 1999 ANNUAL MEETING
 
     Stockholder proposals intended to be presented at the 1999 annual meeting
of stockholders must be received by the Secretary of the Company at its
principal executive offices by December 31, 1998 to be considered for possible
inclusion in the Company's proxy statement and form of proxy used in connection
with such annual meeting.
 
                                    AUDITORS
 
     Subject to its discretion to appoint alternative auditors if it deems such
action appropriate, the Board has retained Deloitte & Touche LLP as the
Company's auditors for the current fiscal year. The Board has been advised that
Deloitte & Touche LLP is independent with regard to the Company within the
meaning of the Securities Act and the applicable published rules and regulations
thereunder. Representatives of Deloitte & Touche LLP are expected to be present
at the Annual Meeting and will have the opportunity to make statements if they
desire and to respond to appropriate questions from stockholders.
 
                           PROXY SOLICITATION EXPENSE
 
     The cost of soliciting proxies will be borne by the Company. The Company
will also request persons, firms and corporations holding shares beneficially
owned by others to send proxy material to, and obtain proxies from, the
beneficial owners of such shares and will, upon request, pay the holders'
reasonable expenses for doing so. ChaseMellon Shareholder Services, 450 West
33rd Street, New York, New York 10001, telephone (212) 273-8080, has been
retained to assist in soliciting proxies by mail, telephone or personal
solicitation for a fee of $3,500 plus expenses.
 
                             AVAILABLE INFORMATION
 
     The Company is subject to the informational requirements of the Exchange
Act and, in accordance therewith, files reports, proxy statements and other
information with the Commission. Reports, proxy statements and other information
filed by the Company may be inspected without charge and copies obtained upon
payment of prescribed fees from the Public Reference Section of the Commission
at Room 1024, Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549,
or at the Commission's regional offices located at 7 World Trade Center, 13th
Floor, New York, New York 10048 and Citicorp Center, 500 West Madison Street,
Suite 1400, Chicago, Illinois 60621-2511, or by way of the Commission's Internet
address, http://www.sec.gov.
 
     The Company will provide without charge to each person to whom a copy of
the Proxy Statement is delivered, upon the written or oral request of any such
persons, additional copies of the Company's Form 10-K for the period ended
December 31, 1997. Requests for such copies should be addressed to: Kilroy
Realty Corporation, 2250 East Imperial Highway, El Segundo, California 90245,
Attn: Secretary, telephone (310) 563-5500.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
     The Company's audited consolidated financial statements for the twelve
months ended December 31, 1997, supplementary financial information and
management's discussion and analysis of financial condition and results of
operations are incorporated by reference in this Proxy Statement from the
Company's 1997 Annual Report on Form 10-K for the period ended December 31,
1997, which report accompanies this Proxy Statement.
 
                                       25
<PAGE>   29
 
                                 OTHER MATTERS
 
     The Board of Directors does not know of any other matter which will be
brought before the Annual Meeting. However, if any other matter properly comes
before the Annual Meeting, or any adjournment or postponement thereof, which may
properly be acted upon, the proxies solicited hereby will be voted on such
matter in accordance with the discretion of the proxy holders named therein.
 
     You are urged to sign, date and return the enclosed proxy in the envelope
provided. No further postage is required if the envelope is mailed within the
United States. If you subsequently decide to attend the Annual Meeting and wish
to vote your shares, you may do so. Your cooperation in giving this matter your
prompt attention will be appreciated.
 
March   , 1998
 
                                          By Order of the Board of Directors,
 
                                          Richard E. Moran Jr.
                                          Executive Vice President, Chief
                                          Financial Officer
                                          and Secretary
 
                                       26
<PAGE>   30
 
                                   EXHIBIT A
 
                                  AMENDMENT TO
                    THE 1997 STOCK OPTION AND INCENTIVE PLAN
                         OF KILROY REALTY CORPORATION,
                            KILROY REALTY, L.P. AND
                             KILROY SERVICES, INC.
 
     This Amendment to the 1997 Stock Option and Incentive Plan of Kilroy Realty
Corporation, Kilroy Realty, L.P. and Kilroy Services, Inc. (this "Amendment") is
adopted by Kilroy Realty Corporation, a Maryland corporation (the "Company"),
Kilroy Realty, L.P, a Delaware limited partnership (the "Operating
Partnership"), and Kilroy Services, Inc., a Maryland corporation (the "Services
Company"), effective as of May 12, 1998.
 
                                    RECITALS
 
     A. The 1997 Stock Option and Incentive Plan of the Company, the Operating
Partnership and the Services Company (the "1997 Plan") was adopted and approved
by the Boards of Directors of the Company and the Services Company on December
8, 1996 and           , respectively.
 
     B. Section 9.2 of the 1997 Plan provides that the Board may amend the 1997
Plan, subject in certain instances to receipt of approval of the stockholders of
the Company.
 
     C. The Boards of Directors of the Company and the Services Company on March
17, 1998, respectively, unanimously adopted, subject to stockholder approval,
this Amendment increasing the number of shares of common stock, par value $.01
per share (the "Common Stock"), of the Company reserved for issuance to a number
of shares of Common Stock equal to 8.9% of the total number of issued and
outstanding shares to be determined on a quarterly basis.
 
     D. The Amendment was presented to the Company's stockholders for approval
at the 1998 Annual Meeting held on May 12, 1998.
 
                                   AMENDMENT
 
     1. The second sentence of the preamble of the 1997 Plan is hereby amended
to read in its entirety as follows: "The Plan consists of four plans, one for
the benefit of the employees, consultants and directors of the Company, one for
the benefit of the employees and consultants of the Partnership, one for the
benefit of the employees, consultants and directors of the Services Company and
one, with respect to "incentive stock options, "as defined in Section 422 of the
Code, for the benefit of the executive officers and employees of the Company."
 
     2. Section 2.1(a) of the 1997 Plan is hereby amended to read in its
entirety as follows: "Section 2.1 -- Shares Subject to Plan.
 
          (a) The shares of stock subject to Options, awards of Restricted Stock
     or Stock Appreciation Rights shall be shares of the Company's Common Stock.
     The aggregate number of such shares which may be issued upon exercise of
     such options or rights or upon any such awards under the Plan shall be
     equal to 8.9% of the number of shares of the Company's Common Stock issued
     and outstanding as of May 12, 1998, and thereafter commencing July 1, 1998
     on each January 1, April 1, July 1 and October 1, such maximum number of
     shares reserved for issuance hereunder shall be increased by a number equal
     to 8.9% of the number of shares of Common Stock issued and outstanding as
     of the last day of the immediately preceding quarter; provided, that the
     maximum number of shares of Common Stock available for issuance under the
     Plan will not be reduced in any quarter that the number of outstanding
     shares of Common Stock on the last day of the immediately preceding fiscal
     quarter is less than the number of outstanding shares of Common Stock on
     the last day of any previous fiscal quarter; provided further, that the
     maximum number of shares of Common Stock issuable under the Plan as
     Incentive
                                       A-1
<PAGE>   31
 
     Stock Options shall not exceed the number of shares available for issuance
     under the Plan as of May 12, 1998, after giving effect to the increase of
     such shares on such date contemplated by this paragraph. The shares of
     Common Stock issuable upon exercise of such options or rights or upon any
     such awards may be either previously authorized but unissued shares or
     treasury shares."
 
     The undersigned, Richard E. Moran Jr., the Secretary of the Company, hereby
certifies that the Board and the stockholders of the Company adopted the
foregoing Amendment on March 17, 1998 and May 12, 1998, respectively,
 
              Executed as El Segundo, California this      day of
              1998.
 
            --------------------------------------------------------------------
              Richard E. Moran Jr.
              Executive Vice President, Chief Financial Officer
              and Secretary
 
                                       A-2
<PAGE>   32
                            KILROY REALTY CORPORATION
                         ANNUAL MEETING OF STOCKHOLDERS
                                  MAY 12, 1998

           THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

         The undersigned stockholder of Kilroy Realty Corporation (the
"Company") acknowledges receipt of a copy of the Annual Report and the proxy
statement dated March 30, 1998, and, revoking any proxy heretofore given,
hereby appoints John B. Kilroy, Sr., John B. Kilroy, Jr., Richard E. Moran Jr.
and each of them, as proxies for the undersigned, and hereby authorizes each of
them to vote all the shares of Common Stock of the Company held of record by the
undersigned of March 24, 1998, at the Annual Meeting of Stockholders to be
held on May 12, 1998, or any adjournment of postponement thereof, and otherwise
to represent the undersigned at the meeting with all powers possessed by the
undersigned if personally present at the meeting.

THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS AND MAY BE REVOKED
PRIOR TO ITS EXERCISE. THIS PROXY, WHEN PROPERLY EXECUTED, WILL BE VOTED AS
DIRECTED HEREIN BY THE UNDERSIGNED STOCKHOLDER. IF NO DIRECTION IS INDICATED, IT
WILL BE VOTED FOR THE NOMINEES FOR DIRECTOR LISTED IN THE PROXY STATEMENT.

1.       PROPOSAL 1:  ELECTION OF DIRECTORS

/ /  FOR          / /  WITHHOLD     / /  ABSTAIN

AUTHORITY

(except as indicated to the contrary)
to vote for ALL nominees listed below.

William P. Dickey

John R. D'Eathe

(Instruction: To withhold authority to vote for any nominee write the nominee's
name on the space provided below)

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

2.       PROPOSAL 2:  STOCK INCENTIVE PLAN AMENDMENT

/ /  FOR          / /  WITHHOLD     / /  ABSTAIN

FORM OF PROXY CARD
[REVERSE SIDE]

Proxy Number Account Number                          Number of Shares

Dated                 , 1998
     -----------------             ---------------------------------------------
                                   (Signature)

Dated                 , 1998
     -----------------             ---------------------------------------------
                                   (Signature)

This proxy will be voted as directed or, if no contrary direction is indicated,
will be voted FOR approval of Proposals I and II.

                                   Date:                                    1998
                                        -----------------------------------,

                                   ---------------------------------------------
                                   (Signature)

                                   NOTE: Please sign exactly as shown at left.
                                   If stock is jointly held, each owner should
                                   sign. Executors, administrators, trustees,
                                   guardians, attorneys and corporate officers
                                   should indicate their fiduciary capacity or
                                   full title when signing.

                                   / / Please check if you have had a change of
                                   address and print your new address and phone
                                   number below:

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

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

                                   ---------------------------------------------
                                   PLEASE COMPLETE, DATE, SIGN AND MAIL THIS
                                   PROXY CARD PROMPTLY IN THE ENCLOSED
                                   ENVELOPE.



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