Document:

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                                                                    Exhibit 10.2

                     CHANGE IN CONTROL EMPLOYMENT AGREEMENT
                     --------------------------------------

                  AGREEMENT by and between CarrAmerica Realty Corporation, a
Maryland corporation (the "Company") and Stephen E. Riffee (the "Executive"),
effective as of the 1st day of April, 2002.

                  The Board of Directors of the Company (the "Board"), has
determined that it is in the best interests of the Company and its shareholders
to assure that the Company will have the continued dedication of the Executive,
notwithstanding the possibility, threat or occurrence of a Change in Control (as
defined below) of the Company. The Board believes it is imperative to diminish
the inevitable distraction of the Executive by virtue of the personal
uncertainties and risks created by a pending or threatened Change in Control and
to encourage the Executive's full attention and dedication to the Company
currently and in the event of any threatened or pending Change in Control, and
to provide the Executive with compensation and benefits arrangements upon a
Change in Control which ensure that the compensation and benefits expectations
of the Executive will be satisfied and which are competitive with those of other
corporations. Therefore, in order to accomplish these objectives, the Board has
caused the Company to enter into this Agreement.

                  NOW, THEREFORE, IT IS HEREBY AGREED AS FOLLOWS:

                  1.  Certain Definitions.
                      -------------------

                  (a) The "Effective Date" shall mean the first date during the
Change in Control Period (as defined in Section 1(b)) on which a Change in
Control (as defined in Section 2) occurs. Anything in this Agreement to the
contrary notwithstanding, if a Change in Control occurs and if the Executive's
employment with the Company is terminated prior to the date on which the Change
in Control occurs, and if it is reasonably demonstrated by the Executive that
such termination of employment (i) was at the request of a third party who has
taken steps reasonably calculated to effect a Change in Control or (ii)
otherwise arose in connection with or anticipation of a Change in Control, then
for all purposes of this Agreement the "Effective Date" shall mean the date
immediately prior to the date of such termination of employment.

                  (b) The "Change in Control Period" shall mean the period
commencing on the date hereof and ending on the third anniversary of the date
hereof; provided, however, that commencing on the date three years after the
        --------
date hereof, and on each annual anniversary of such date (such date and each
annual anniversary thereof shall be hereinafter referred to as the "Renewal
Date"), unless at least 12 months prior to the Renewal Date the Company shall
give notice to the Executive that the Change in Control Period shall not be so
extended, the Change in Control Period shall be automatically extended so as to
terminate one year from such Renewal Date.

                  2.  Change in Control.  For the purpose of this Agreement, a
                      -----------------
"Change in Control" shall mean:

                  (a) Individuals who, as of the date hereof, constitute the
Board (the "Incumbent Board") cease for any reason to constitute at least a
majority of the Board; provided, however, that any individual becoming a
director subsequent to the date hereof whose election, or nomination for
election

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by the Company's shareholders, was approved by a vote of at least a majority of
the directors then comprising the Incumbent Board shall be considered as though
such individual were a member of the Incumbent Board, but excluding, for this
purpose, any such individual whose initial assumption of office occurs as a
result of an actual or threatened election contest with respect to the election
or removal of directors or other actual or threatened solicitation of proxies or
consents by or on behalf of a Person other than the Board; or

                  (b) Consummation of a reorganization, merger or consolidation
involving the Company (a "Business Combination") unless, following such Business
Combination, (i) all or substantially all of the individuals and entities who
were the beneficial owners, respectively, of the then outstanding shares of
common stock of the Company (the "Outstanding Company Common Stock") and the
combined voting power of the then outstanding voting securities of the Company
entitled to vote generally in the election of directors (the "Outstanding
Company Voting Securities") immediately prior to such Business Combination
beneficially own, directly or indirectly, at least 60% of, respectively, the
then outstanding shares of common stock and the combined voting power of the
then outstanding voting securities entitled to vote generally in the election of
directors, as the case may be, of the corporation resulting from such Business
Combination (including, without limitation, a corporation which as a result of
such transaction owns the Company or all or substantially all of the Company's
assets either directly or through one or more subsidiaries) in substantially the
same proportions as their ownership, immediately prior to such Business
Combination of the Outstanding Company Common Stock and Outstanding Company
Voting Securities, as the case may be, and (ii) at least a majority of the
members of the board of directors of the corporation resulting from such
Business Combination were members of the Incumbent Board at the time of the
execution of the initial agreement, or of the action of the Board, providing for
such Business Combination;

                  (c) the sale or other disposition of more than 50% of the
operating assets of the Company; or

                  (d) Approval by the shareholders of the Company of a complete
liquidation or dissolution of the Company.

                  3.  Employment Period. The Company hereby agrees to continue
                      -----------------
the Executive in its employ, and the Executive hereby agrees to remain in the
employ of the Company subject to the terms and conditions of this Agreement, for
the period commencing on the Effective Date and ending on the second anniversary
of such date (the "Employment Period").

                  4.  Terms of Employment.
                      -------------------

                  (a) Position and Duties.
                      -------------------

                      (i) During the Employment Period, (A) the Executive's
         position (including status, offices, titles and reporting
         requirements), authority, duties and responsibilities shall be
         performed for the senior surviving company following a Change in
         Control as described in Section 2(b) of this Agreement, and such
         position shall be at least commensurate in all material respects with
         the most significant of those held, exercised and assigned at any time
         during the 120-day period immediately preceding the Effective Date and
         (B) the Executive's services shall be performed at the location where
         the Executive was employed immediately preceding the Effective Date or
         any office or location less than 35 miles from such location.

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                      (ii) During the Employment Period, and excluding any
         periods of vacation and personal leave to which the Executive is
         entitled, the Executive agrees to devote reasonable attention and time
         during normal business hours to the business and affairs of the Company
         and, to the extent necessary to discharge the responsibilities assigned
         to the Executive hereunder, to use the Executive's reasonable best
         efforts to perform faithfully and efficiently such responsibilities.
         During the Employment Period, it shall not be a violation of this
         Agreement for the Executive to (A) serve on corporate, civic or
         charitable boards or committees, (B) deliver lectures, fulfill speaking
         engagements or teach at educational institutions and (C) manage
         personal investments, so long as such activities do not significantly
         interfere with the performance of the Executive's responsibilities as
         an employee of the Company in accordance with this Agreement. It is
         expressly understood and agreed that to the extent that any such
         activities have been conducted by the Executive prior to the Effective
         Date, the continued conduct of such activities (or the conduct of
         activities similar in nature and scope thereto) subsequent to the
         Effective Date shall not thereafter be deemed to interfere with the
         performance of the Executive's responsibilities to the Company.

                  (b) Compensation.
                      ------------

                      (i)   Base Salary. During the Employment Period, the
                            -----------
         Executive shall receive an annual base salary ("Annual Base Salary"),
         which shall be paid at a monthly rate, at least equal to twelve times
         the highest monthly base salary paid or payable, including any base
         salary which has been earned but deferred, to the Executive by the
         Company and its affiliated companies in respect of the twelve-month
         period immediately preceding the month in which the Effective Date
         occurs. During the Employment Period, the Annual Base Salary shall be
         reviewed no more than 12 months after the last salary increase awarded
         to the Executive prior to the Effective Date and thereafter at least
         annually. Any increase in Annual Base Salary shall not serve to limit
         or reduce any other obligation to the Executive under this Agreement.
         Annual Base Salary shall not be reduced after any such increase and the
         term Annual Base Salary as utilized in this Agreement shall refer to
         Annual Base Salary as so increased. As used in this Agreement, the term
         "affiliated companies" shall include any company controlled by,
         controlling or under common control with the Company.

                      (ii)  Annual Bonus. In addition to Annual Base Salary, the
                            ------------
         Executive shall be awarded, for each fiscal year ending during the
         Employment Period, an annual bonus (the "Annual Bonus") in cash at
         least equal to the greater of (x) Executive's highest actual bonus
         under the Company's annual bonus plan, or any comparable bonus under
         any predecessor or successor plan, for the last three full fiscal years
         prior to the Effective Date (annualized in the event that the Executive
         was not employed by the Company for the whole of such fiscal year) (the
         "Recent Annual Bonus") or (y) the target annual bonus for the fiscal
         year which includes the Effective Date. Each such Annual Bonus shall be
         paid no later than the end of the third month of the fiscal year next
         following the fiscal year for which the Annual Bonus is awarded, unless
         the Executive shall elect to defer the receipt of such Annual Bonus.

                      (iii) Incentive, Savings and Retirement Plans. During the
                            ---------------------------------------
         Employment Period, the Executive shall be entitled to participate in
         all incentive, savings and retirement plans, practices, policies and
         programs applicable generally to other peer executives of the Company
         and its affiliated companies, but in no event shall such plans,
         practices, policies and programs provide the Executive with incentive
         opportunities (measured with respect to both regular and special
         incentive opportunities, to the extent, if any, that such distinction
         is

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         applicable), savings opportunities and retirement benefit
         opportunities, in each case, less favorable, in the aggregate, than the
         most favorable of those provided by the Company and its affiliated
         companies for the Executive under such plans, practices, policies and
         programs as in effect at any time during the 120-day period immediately
         preceding the Effective Date or if more favorable to the Executive,
         those provided generally at any time after the Effective Date to other
         peer executives of the Company and its affiliated companies.

                           (iv)   Welfare Benefit Plans. During the Employment
                                  ---------------------
         Period, the Executive and/or the Executive's family, as the case may
         be, shall be eligible for participation in and shall receive all
         benefits under welfare benefit plans, practices, policies and programs
         provided by the Company and its affiliated companies (including,
         without limitation, medical, prescription, dental, vision, disability,
         employee split dollar life, group life, accidental death and travel
         accident insurance plans and programs) to the extent applicable
         generally to other peer executives of the Company and its affiliated
         companies, but in no event shall such plans, practices, policies and
         programs provide the Executive with benefits which are less favorable,
         in the aggregate, than the most favorable of such plans, practices,
         policies and programs in effect for the Executive at any time during
         the 120-day period immediately preceding the Effective Date or, if more
         favorable to the Executive, those provided generally at any time after
         the Effective Date to other peer executives of the Company and its
         affiliated companies.

                           (v)    Expenses. During the Employment Period, the
                                  --------
         Executive shall be entitled to receive prompt reimbursement for all
         reasonable expenses incurred by the Executive in accordance with the
         most favorable policies, practices and procedures of the Company and
         its affiliated companies in effect for the Executive at any time during
         the 120-day period immediately preceding the Effective Date or, if more
         favorable to the Executive, as in effect generally at any time
         thereafter with respect to other peer executives of the Company and its
         affiliated companies.

                           (vi)   Fringe Benefits. During the Employment Period,
                                  ---------------
         the Executive shall be entitled to fringe benefits in accordance with
         the most favorable plans, practices, programs and policies of the
         Company and its affiliated companies in effect for the Executive at any
         time during the 120-day period immediately preceding the Effective Date
         or, if more favorable to the Executive, as in effect generally at any
         time thereafter with respect to other peer executives of the Company
         and its affiliated companies.

                           (vii)  Office and Support Staff. During the
                                  ------------------------
          Employment Period, the Executive shall be entitled to an office or
         offices of a size and with furnishings and other appointments, and to
         exclusive personal secretarial and other assistance, at least equal to
         the most favorable of the foregoing provided to the Executive by the
         Company and its affiliated companies at any time during the 120-day
         period immediately preceding the Effective Date or, if more favorable
         to the Executive, as provided generally at any time thereafter with
         respect to other peer executives of the Company and its affiliated
         companies.

                           (viii) Vacation. During the Employment Period, the
                                  --------
         Executive shall be entitled to paid vacation in accordance with the
         most favorable plans, policies, programs and practices of the Company
         and its affiliated companies as in effect for the Executive at any time
         during the 120-day period immediately preceding the Effective Date or,
         if more favorable to the Executive, as in effect generally at any time
         thereafter with respect to other peer executives of the Company and its
         affiliated companies.

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                  5.       Termination of Employment.
                           -------------------------

                  (a)      Death or Disability. The Executive's employment shall
                           -------------------
terminate automatically upon the Executive's death during the Employment Period.
If the Company determines in good faith that the Disability of the Executive has
occurred during the Employment Period (pursuant to the definition of Disability
set forth below), it may give to the Executive written notice in accordance with
Section 14(b) of this Agreement of its intention to terminate the Executive's
employment. In such event, the Executive's employment with the Company shall
terminate effective on the 30th day after receipt of such notice by the
Executive (the "Disability Effective Date"), provided that, within the 30 days
after such receipt, the Executive shall not have returned to full-time
performance of the Executive's duties. For purposes of this Agreement,
"Disability" shall mean the absence of the Executive from the Executive's duties
with the Company on a full-time basis for 180 consecutive business days as a
result of incapacity due to mental or physical illness which is determined to be
total and permanent by a physician selected by the Company or its insurers and
acceptable to the Executive or the Executive's legal representative.

                  (b)      Cause. The Company may terminate the Executive's
                           -----
employment during the Employment Period for Cause. For purposes of this
Agreement, "Cause" shall mean:

                           (i)  the willful and continued failure of the
         Executive to perform substantially the Executive's duties with the
         Company or one of its affiliates (other than any such failure resulting
         from incapacity due to physical or mental illness), after a written
         demand for substantial performance is delivered to the Executive by the
         Board or the Chief Executive Officer of the Company which specifically
         identifies the manner in which the Board or Chief Executive Officer
         believes that the Executive has not substantially performed the
         Executive's duties, or

                           (ii) the willful engaging by the Executive in illegal
         conduct or gross misconduct which is materially and demonstrably
         injurious to the Company.

For purposes of this provision, no act or failure to act, on the part of the
Executive, shall be considered "willful" unless it is done, or omitted to be
done, by the Executive in bad faith or without reasonable belief that the
Executive's action or omission was in the best interests of the Company. Any
act, or failure to act, based upon authority given pursuant to a resolution duly
adopted by the Board or upon the instructions of the Chief Executive Officer or
a senior officer of the Company or based upon the advice of counsel for the
Company shall be conclusively presumed to be done, or omitted to be done, by the
Executive in good faith and in the best interests of the Company. The cessation
of employment of the Executive shall not be deemed to be for Cause unless and
until there shall have been delivered to the Executive a copy of a resolution
duly adopted by the affirmative vote of not less than three-quarters of the
entire membership of the Board at a meeting of the Board called and held for
such purpose (after reasonable notice is provided to the Executive and the
Executive is given an opportunity, together with counsel, to be heard before the
Board), finding that, in the good faith opinion of the Board, the Executive is
guilty of the conduct described in subparagraph (i) or (ii) above, and
specifying the particulars thereof in detail.

                  (c)      Good Reason. The Executive's employment may be
                           -----------
terminated by the Executive for Good Reason. For purposes of this Agreement,
"Good Reason" shall mean:

                           (i)  the assignment to the Executive of any duties
         inconsistent in any respect with the Executive's position (including
         status, offices, titles and reporting requirements),

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         authority, duties or responsibilities as contemplated by Section 4(a)
         of this Agreement, or any other action by the Company which results in
         a diminution in such position, authority, duties or responsibilities,
         excluding for this purpose an isolated, insubstantial and inadvertent
         action not taken in bad faith and which is remedied by the Company
         promptly after receipt of notice thereof given by the Executive;

                           (ii)  any failure by the Company to comply with any
         of the provisions of Section 4(b) of this Agreement, other than an
         isolated, insubstantial and inadvertent failure not occurring in bad
         faith and which is remedied by the Company promptly after receipt of
         notice thereof given by the Executive;

                           (iii) the Company's requiring the Executive to be
         based at any office or location other than as provided in Section
         4(a)(i)(B) hereof or the Company's requiring the Executive to travel on
         Company business to a substantially greater extent than required
         immediately prior to the Effective Date;

                           (iv)  any purported termination by the Company of the
         Executive's employment otherwise than as expressly permitted by this
         Agreement; or

                           (v)   any failure by the Company to comply with and
         satisfy Section 14(c) of this Agreement.

For purposes of this Section 5(c), any good faith determination of "Good Reason"
made by the Executive shall be conclusive.

                  (d)      Notice of Termination. Any termination by the Company
                           ---------------------
for Cause, or by the Executive for Good Reason, shall be communicated by Notice
of Termination to the other party hereto given in accordance with Section 14(b)
of this Agreement. For purposes of this Agreement, a "Notice of Termination"
means a written notice which (i) indicates the specific termination provision in
this Agreement relied upon, (ii) to the extent applicable, sets forth in
reasonable detail the facts and circumstances claimed to provide a basis for
termination of the Executive's employment under the provision so indicated and
(iii) if the Date of Termination (as defined below) is other than the date of
receipt of such notice, specifies the termination date (which date shall be not
more than thirty days after the giving of such notice). The failure by the
Executive or the Company to set forth in the Notice of Termination any fact or
circumstance which contributes to a showing of Good Reason or Cause shall not
waive any right of the Executive or the Company, respectively, hereunder or
preclude the Executive or the Company, respectively, from asserting such fact or
circumstance in enforcing the Executive's or the Company's rights hereunder.

                  (e)      Date of Termination. "Date of Termination" means (i)
                           -------------------
if the Executive's employment is terminated by the Company for Cause, or by the
Executive for Good Reason, the date of receipt of the Notice of Termination or
any later date specified therein, as the case may be, (ii) if the Executive's
employment is terminated by the Company other than for Cause or Disability, the
Date of Termination shall be the date on which the Company notifies the
Executive of such termination and (iii) if the Executive's employment is
terminated by reason of death or Disability, the Date of Termination shall be
the date of death of the Executive or the Disability Effective Date, as the case
may be.

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                  6.  Obligations of the Company upon Termination.
                      -------------------------------------------

                  (a) Good Reason; Other Than for Cause, Death or Disability.
                      ------------------------------------------------------
If, during the Employment Period, the Company shall terminate the Executive's
employment other than for Cause or Disability or the Executive shall terminate
employment for Good Reason:

                      (i)  the Company shall pay to the Executive in a lump sum
         in cash within 30 days after the Date of Termination the aggregate of
         the following amounts:

                           A. the sum of (1) the Executive's Annual Base Salary
                  through the Date of Termination to the extent not theretofore
                  paid, (2) the product of (x) the greater of (i) the Recent
                  Annual Bonus or (ii) the target annual bonus for the fiscal
                  year which includes the Date of Termination and (y) a
                  fraction, the numerator of which is the number of days in the
                  current fiscal year through the Date of Termination, and the
                  denominator of which is 365 and (3) any compensation
                  previously deferred by the Executive (together with any
                  accrued interest or earnings thereon) and any accrued vacation
                  pay, in each case to the extent not theretofore paid (the sum
                  of the amounts described in clauses (1), (2), and (3) shall be
                  hereinafter referred to as the "Accrued Obligations"); and

                           B. the amount equal to the product of (1) two and (2)
                  the sum of (x) the Executive's Annual Base Salary and (y) the
                  greater of (i) the Recent Annual Bonus or (ii) the target
                  annual bonus for the fiscal year which includes the Date of
                  Termination; and

                           C. the amount equal to the company's contributions to
                  all incentive, savings and retirement plans, practices,
                  policies and programs applicable generally to the Executive as
                  in effect at any time during the 120-day period immediately
                  preceding the Effective Date, which would have been made on
                  behalf of the Executive if the Executive's employment
                  continued for two years after the Date of Termination assuming
                  for this purpose that all benefits are fully vested, and,
                  assuming that the Executive's compensation in each of the two
                  years is that required by Section 4(b)(i) and Section 4
                  (b)(ii);

                      (ii) for two years after the Executive's Date of
         Termination, or such longer period as may be provided by the terms of
         the appropriate plan, program, practice or policy, the Company shall
         continue benefits to the Executive and/or the Executive's family at
         least equal to those which would have been provided to them in
         accordance with the plans, programs, practices and policies described
         in Section 4(b)(iv) of this Agreement if the Executive's employment had
         not been terminated or, if more favorable to the Executive, as in
         effect generally at any time thereafter with respect to other peer
         executives of the Company and its affiliated companies and their
         families, provided, however, that if the Executive becomes reemployed
         with another employer and is eligible to receive medical or other
         welfare benefits under another employer provided plan, the medical and
         other welfare benefits described herein shall be secondary to those
         provided under such other plan during such applicable period of
         eligibility. For purposes of determining eligibility (but not the time
         of commencement of benefits) of the Executive for retiree benefits
         pursuant to such plans, practices, programs and policies, the Executive
         shall be considered to have remained employed until two years after the
         Date of Termination and to have retired on the last day of such period;

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                      (iii) for a period of six months after the Executive's
         Date of Termination, the Company shall, at its sole expense as
         incurred, provide the Executive with temporary office space or
         reasonable outplacement services, the scope and provider of which shall
         be selected by the Executive in his sole discretion; and

                      (iv)  for two years after the Executive's Date of
         Termination, to the extent not theretofore paid or provided, the
         Company shall timely pay or provide to the Executive any other amounts
         or benefits required to be paid or provided or which the Executive is
         eligible to receive under any plan, program, policy or practice or
         contract or agreement including, without limitation, any employee split
         dollar life insurance plan of the Company and its affiliated companies
         (such other amounts and benefits shall be hereinafter referred to as
         the "Other Benefits").

                  (b) Death. If the Executive's employment is terminated by
                      -----
reason of the Executive's death during the Employment Period, this Agreement
shall terminate without further obligations to the Executive's legal
representatives under this Agreement, other than for payment of Accrued
Obligations and the timely payment or provision of Other Benefits. Accrued
Obligations shall be paid to the Executive's estate or beneficiary, as
applicable, in a lump sum in cash within 30 days of the Date of Termination.
With respect to the provision of Other Benefits, the term Other Benefits as
utilized in this Section 6(b) shall include, without limitation, and the
Executive's estate and/or beneficiaries shall be entitled to receive, benefits
at least equal to the most favorable benefits provided by the Company and
affiliated companies to the estates and beneficiaries of peer executives of the
Company and such affiliated companies under such plans, programs, practices and
policies relating to death benefits, if any, as in effect with respect to other
peer executives and their beneficiaries at any time during the 120-day period
immediately preceding the Effective Date or, if more favorable to the
Executive's estate and/or the Executive's beneficiaries, as in effect on the
date of the Executive's death with respect to other peer executives of the
Company and its affiliated companies and their beneficiaries.

                  (c) Disability. If the Executive's employment is terminated by
                      ----------
reason of the Executive's Disability during the Employment Period, this
Agreement shall terminate without further obligations to the Executive, other
than for payment of Accrued Obligations and the timely payment or provision of
Other Benefits. Accrued Obligations shall be paid to the Executive in a lump sum
in cash within 30 days of the Date of Termination. With respect to the provision
of Other Benefits, the term Other Benefits as utilized in this Section 6(c)
shall include, and the Executive shall be entitled after the Disability
Effective Date to receive, disability and other benefits at least equal to the
most favorable of those generally provided by the Company and its affiliated
companies to disabled executives and/or their families in accordance with such
plans, programs, practices and policies relating to disability, if any, as in
effect generally with respect to other peer executives and their families at any
time during the 120-day period immediately preceding the Effective Date or, if
more favorable to the Executive and/or the Executive's family, as in effect at
any time thereafter generally with respect to other peer executives of the
Company and its affiliated companies and their families.

                  (d) Cause; Other than for Good Reason. If the Executive's
                      ---------------------------------
employment shall be terminated for Cause during the Employment Period, this
Agreement shall terminate without further obligations to the Executive other
than the obligation to pay to the Executive (x) his Annual Base Salary through
the Date of Termination, (y) the amount of any compensation previously deferred
by the Executive, and (z) Other Benefits, in each case to the extent theretofore
unpaid. If the Executive voluntarily terminates employment during the Employment
Period, excluding a termination for Good Reason, this Agreement shall terminate
without further obligations to the Executive, other than for

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Accrued Obligations and the timely payment or provision of Other Benefits. In
such case, all Accrued Obligations shall be paid to the Executive in a lump sum
in cash within 30 days of the Date of Termination.

                  7.  Effect on Option, Restricted Stock and Restricted Unit
                      ------------------------------------------------------
Agreements. Immediately prior to a Change in Control, all stock options,
----------
restricted stock unit grants or other equity awards made to the Executive by
Company or any affiliate thereof which are outstanding at the time of such event
shall be accelerated and vest. Accordingly, all stock options, restricted stock
unit grants or other equity awards shall be exercisable at such time in
accordance with their terms. This Agreement is intended to amend all stock
options, restricted stock unit grants or other equity awards previously awarded
to the Executive to accelerate vesting as described above to the extent vesting
would not otherwise be accelerated under the terms of such stock options,
restricted stock unit grants or other equity awards. This Agreement is also
intended to expressly exclude application of Section 13 of the CarrAmerica
Realty Corporation 1997 Stock Option and Incentive Plan and any similar
provision of any stock option, restricted stock unit grant or other equity award
of the Company or any affiliate thereof and to amend all stock options,
restricted stock unit grants or other equity awards previously awarded to the
Executive to provide the Executive with certain additional payments in
accordance with the terms of Section 10 of this Agreement to the extent the
Executive would not otherwise receive a Gross-Up Payment (as defined in Section
10 of this Agreement).

                  8.  Non-Exclusivity of Rights. Nothing in this Agreement shall
                      -------------------------
prevent or limit the Executive's continuing or future participation in any plan,
program, policy or practice provided by the Company or any of its affiliated
companies and for which the Executive may qualify, nor, subject to Section
14(f), shall anything herein limit or otherwise affect such rights as the
Executive may have under any contract or agreement with the Company or any of
its affiliated companies. Amounts which are vested benefits or which the
Executive is otherwise entitled to receive under any plan, policy, practice or
program of or any contract or agreement with the Company or any of its
affiliated companies at or subsequent to the Date of Termination shall be
payable in accordance with such plan, policy, practice or program or contract or
agreement except as explicitly modified by this Agreement.

                  9.  Full Settlement. The Company's obligation to make the
                      ---------------
payments provided for in this Agreement and otherwise to perform its obligations
hereunder shall not be affected by any set-off, counterclaim, recoupment,
defense or other claim, right or action which the Company may have against the
Executive or others. In no event shall the Executive be obligated to seek other
employment or take any other action by way of mitigation of the amounts payable
to the Executive under any of the provisions of this Agreement and such amounts
shall not be reduced whether or not the Executive obtains other employment. The
Company agrees to pay as incurred, to the full extent permitted by law, all
legal fees and expenses which the Executive may reasonably incur as a result of
any contest (regardless of the outcome thereof) by the Company, the Executive or
others of the validity or enforceability of, or liability under, any provision
of this Agreement or any guarantee of performance thereof (including as a result
of any contest by the Executive about the amount of any payment pursuant to this
Agreement), plus in each case interest on any delayed payment at the applicable
Federal rate provided for in Section 7872(f) (2) (A) of the Internal Revenue
Code of 1986, as amended (the "Code").

                  10. Certain Additional Payments by the Company.
                      ------------------------------------------

                  (a) Anything in this Agreement to the contrary notwithstanding
and except as set forth below, in the event it shall be determined that any
payment or distribution by the Company to or for the benefit of the Executive
(whether paid or payable or distributed or distributable pursuant to the terms

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of this Agreement or otherwise, but determined without regard to any additional
payments required under this Section 10) (a "Payment") would be subject to the
excise tax imposed by Section 4999 of the Code or any interest or penalties are
incurred by the Executive with respect to such excise tax (such excise tax,
together with any such interest and penalties, are hereinafter collectively
referred to as the "Excise Tax"), then the Executive shall be entitled to
receive an additional payment (a "Gross-Up Payment") in an amount such that
after payment by the Executive of all taxes (including any interest or penalties
imposed with respect to such taxes), including, without limitation, any income
taxes (and any interest and penalties imposed with respect thereto) and Excise
Tax imposed upon the Gross-Up Payment, the Executive retains an amount of the
Gross-Up Payment equal to the Excise Tax imposed upon the Payments.
Notwithstanding the foregoing provisions of this Section 10(a), if it shall be
determined that the Executive is entitled to a Gross-Up Payment, but that the
Executive, after taking into account the Payments and the Gross-Up Payment,
would not receive a net after-tax benefit of at least $25,000 (taking into
account both income taxes and any Excise Tax) as compared to the net after-tax
proceeds to the Executive resulting from an elimination of the Gross-Up Payment
and a reduction of the Payments, in the aggregate, to an amount (the "Reduced
Amount") such that the receipt of Payments would not give rise to any Excise
Tax, then no Gross-Up Payment shall be made to the Executive and the Payments,
in the aggregate, shall be reduced to the Reduced Amount.

                  (b) Subject to the provisions of Section 10(c), all
determinations required to be made under this Section 10, including whether and
when a Gross-Up Payment is required and the amount of such Gross-Up Payment and
the assumptions to be utilized in arriving at such determination, shall be made
by Arthur Andersen LLP or such other certified public accounting firm as may be
designated by the Executive (the "Accounting Firm") which shall provide detailed
supporting calculations both to the Company and the Executive within 15 business
days of the receipt of notice from the Executive that there has been a Payment,
or such earlier time as is requested by the Company. In the event that the
Accounting Firm is serving as accountant or auditor for the individual, entity
or group effecting the Change in Control, the Executive shall appoint another
nationally recognized accounting firm to make the determinations required
hereunder (which accounting firm shall then be referred to as the Accounting
Firm hereunder). All fees and expenses of the Accounting Firm shall be borne
solely by the Company. Any Gross-Up Payment, as determined pursuant to this
Section 10, shall be paid by the Company to the Executive within five days of
the receipt of the Accounting Firm's determination. Any determination by the
Accounting Firm shall be binding upon the Company and the Executive. As a result
of the uncertainty in the application of Section 4999 of the Code at the time of
the initial determination by the Accounting Firm hereunder, it is possible that
Gross-Up Payments which will not have been made by the Company should have been
made ("Underpayment"), consistent with the calculations required to be made
hereunder. In the event that the Company exhausts its remedies pursuant to
Section 10(c) and the Executive thereafter is required to make a payment of any
Excise Tax, the Accounting Firm shall determine the amount of the Underpayment
that has occurred and any such Underpayment shall be promptly paid by the
Company to or for the benefit of the Executive.

                  (c) The Executive shall notify the Company in writing of any
claim by the Internal Revenue Service that, if successful, would require the
payment by the Company of the Gross-Up Payment. Such notification shall be given
as soon as practicable after the Executive is informed in writing of such claim
and shall apprise the Company of the nature of such claim and the date on which
such claim is requested to be paid. The Executive shall not pay such claim prior
to the expiration of the 30-day period following the date on which it gives such
notice to the Company (or such shorter period ending on the date that any
payment of taxes with respect to such claim is due). If the Company notifies the
Executive in writing prior to the expiration of such period that it desires to
contest such claim, the Executive shall:

                                       10

<PAGE>

                           (i)   give the Company any information reasonably
         requested by the Company relating to such claim,

                           (ii)  take such action in connection with contesting
         such claim as the Company shall reasonably request in writing from time
         to time, including, without limitation, accepting legal representation
         with respect to such claim by an attorney reasonably selected by the
         Company,

                           (iii) cooperate with the Company in good faith in
         order effectively to contest such claim, and

                           (iv)  permit the Company to participate in any
         proceedings relating to such claim;

provided, however, that the Company shall bear and pay directly all costs and
--------
expenses (including additional interest and penalties) incurred in connection
with such contest and shall indemnify and hold the Executive harmless, on an
after-tax basis, for any Excise Tax or income tax (including interest and
penalties with respect thereto) imposed as a result of such representation and
payment of costs and expenses. Without limitation on the foregoing provisions of
this Section 10(c), the Company shall control all proceedings taken in
connection with such contest and, at its sole option, may pursue or forgo any
and all administrative appeals, proceedings, hearings and conferences with the
taxing authority in respect of such claim and may, at its sole option, either
direct the Executive to pay the tax claimed and sue for a refund or contest the
claim in any permissible manner, and the Executive agrees to prosecute such
contest to a determination before any administrative tribunal, in a court of
initial jurisdiction and in one or more appellate courts, as the Company shall
determine; provided, however, that if the Company directs the Executive to pay
such claim and sue for a refund, the Company shall advance the amount of such
payment to the Executive, on an interest-free basis and shall indemnify and hold
the Executive harmless, on an after-tax basis, from any Excise Tax or income tax
(including interest or penalties with respect thereto) imposed with respect to
such advance or with respect to any imputed income with respect to such advance;
and further provided that any extension of the statute of limitations relating
to payment of taxes for the taxable year of the Executive with respect to which
such contested amount is claimed to be due is limited solely to such contested
amount. Furthermore, the Company's control of the contest shall be limited to
issues with respect to which a Gross-Up Payment would be payable hereunder and
the Executive shall be entitled to settle or contest, as the case may be, any
other issue raised by the Internal Revenue Service or any other taxing
authority.

                  (d)      If, after the receipt by the Executive of an amount
advanced by the Company pursuant to Section 10(c), the Executive becomes
entitled to receive any refund with respect to such claim, the Executive shall
(subject to the Company's complying with the requirements of Section 10(c))
promptly pay to the Company the amount of such refund (together with any
interest paid or credited thereon after taxes applicable thereto). If, after the
receipt by the Executive of an amount advanced by the Company pursuant to
Section 10(c), a determination is made that the Executive shall not be entitled
to any refund with respect to such claim and the Company does not notify the
Executive in writing of its intent to contest such denial of refund prior to the
expiration of 30 days after such determination, then such advance shall be
forgiven and shall not be required to be repaid and the amount of such advance
shall offset, to the extent thereof, the amount of Gross-Up Payment required to
be paid.

                  11.      Confidential Information. The Executive shall hold in
                           ------------------------
a fiduciary capacity for the benefit of the Company all secret or confidential
information, knowledge or data relating to the

                                       11

<PAGE>

Company or any of its affiliated companies, and their respective businesses,
which shall have been obtained by the Executive during the Executive's
employment by the Company or any of its affiliated companies and which shall not
be or become public knowledge (other than by acts by the Executive or
representatives of the Executive in violation of this Agreement). After
termination of the Executive's employment with the Company, the Executive shall
not, without the prior written consent of the Company or as may otherwise be
required by law or legal process, communicate or divulge any such information,
knowledge or data to anyone other than the Company and those designated by it.
In no event shall an asserted violation of the provisions of this Section 11
constitute a basis for deferring or withholding any amounts otherwise payable to
the Executive under this Agreement.

                  12.      Pooling of Interests Accounting Treatment.
                           -----------------------------------------
Notwithstanding anything to the contrary contained herein, to the extent that
any payment or other benefit under this Agreement would prevent a Change in
Control transaction involving the Company which would otherwise qualify for
pooling of interests accounting treatment from so qualifying, then the provision
setting forth such payment or benefit shall be deemed amended or revoked to the
extent required to preserve such pooling of interests treatment. The Board will
use good faith efforts to provide the Executive with a substitute benefit that
is as comparable as possible under the circumstances and which will not limit or
otherwise restrict the use of pooling of interests accounting treatment. The
Executive will, upon advice from the Company, take (or refrain from taking, as
appropriate) all actions necessary or desirable to ensure that pooling of
interests accounting is available for such transaction.

                  13.      Successors.
                           ----------

                  (a)      This Agreement is personal to the Executive and
without the prior written consent of the Company shall not be assignable by the
Executive otherwise than by will or the laws of descent and distribution. This
Agreement shall inure to the benefit of and be enforceable by the Executive's
legal representatives.

                  (b)      This Agreement shall inure to the benefit of and be
binding upon the Company and its successors and assigns.

                  (c)      The Company will require any successor (whether
direct or indirect, by purchase, merger, consolidation or otherwise) to all or
substantially all of the business and/or assets of the Company to assume
expressly and agree to perform this Agreement in the same manner and to the same
extent that the Company would be required to perform it if no such succession
had taken place. As used in this Agreement, "Company" shall mean the Company as
hereinbefore defined and any successor to its business and/or assets as
aforesaid which assumes and agrees to perform this Agreement by operation of
law, or otherwise.

                  14.      Miscellaneous.
                           -------------

                  (a)      This Agreement shall be governed by and construed in
accordance with the laws of the District of Columbia, without reference to
principles of conflict of laws. The captions of this Agreement are not part of
the provisions hereof and shall have no force or effect. This Agreement may not
be amended or modified otherwise than by a written agreement executed by the
parties hereto or their respective successors and legal representatives.

                                       12

<PAGE>

                  (b) All notices and other communications hereunder shall be in
writing and shall be given by hand delivery to the other party or by registered
or certified mail, return receipt requested, postage prepaid, addressed as
follows:

                  If to the Executive:
                  --------------------

                  Stephen E. Riffee
                  2410 Stryker Avenue
                  Vienna, VA 22181

                  If to the Company:
                  -----------------

                  CarrAmerica Realty Corporation
                  1850 K Street, NW
                  Washington, DC 20006
                  Attention: Linda A. Madrid, Managing Director, General Counsel
                  and Secretary

                  with a copy (which shall not constitute notice) to:

                  Hogan & Hartson L.L.P.
                  555 13th Street, NW
                  Washington, DC 20004
                  Attention: J. Warren Gorrell, Jr.

or to such other address as either party shall have furnished to the other in
writing in accordance herewith. Notice and communications shall be effective
when actually received by the addressee.

                  (c) The invalidity or unenforceability of any provision of
this Agreement shall not affect the validity or enforceability of any other
provision of this Agreement.

                  (d) The Company may withhold from any amounts payable under
this Agreement such Federal, state, local or foreign taxes as shall be required
to be withheld pursuant to any applicable law or regulation.

                  (e) The Executive's or the Company's failure to insist upon
strict compliance with any provision of this Agreement or the failure to assert
any right the Executive or the Company may have hereunder, including, without
limitation, the right of the Executive to terminate employment for Good Reason
pursuant to Section 5(c)(i)-(v) of this Agreement, shall not be deemed to be a
waiver of such provision or right or any other provision or right of this
Agreement.

                  (f) The Executive and the Company acknowledge that, except as
may otherwise be provided under any other written agreement between the
Executive and the Company, the employment of the Executive by the Company is "at
will" and, subject to Section 1(a) hereof, prior to the Effective Date, the
Executive's employment and/or this Agreement may be terminated by either the
Executive or the Company at any time prior to the Effective Date, in which case
the Executive shall have no further rights under this Agreement. From and after
the Effective Date this Agreement shall supersede any other agreement between
the parties with respect to the subject matter hereof.

                                       13

<PAGE>

                  IN WITNESS WHEREOF, the Executive has hereunto set the
Executive's hand and, pursuant to the authorization from its Board of Directors,
the Company has caused these presents to be executed in its name on its behalf,
all as of the day and year first above written.

                               Signature: /s/ Stephen E. Riffee
                                          Stephen E. Riffee

                                    Date: April 1, 2002
                                          ----------------------

                               CARRAMERICA REALTY CORPORATION

                                      By: /s/ Linda A. Madrid
                                      Name: Linda A. Madrid
                                      Title: Managing Director, General Counsel,
                                               & Corporate Secretary

                                    Date: April 1, 2002
                                          ----------------------

                                       14<PAGE>
                                                                    Exhibit 10.1

                               TREX COMPANY, INC.
                      1999 STOCK OPTION AND INCENTIVE PLAN

                           RESTRICTED STOCK AGREEMENT

         Trex Company, Inc., a Delaware corporation (the "Company"), hereby
grants shares of its common stock, $.01 par value (the "Stock"), to the Grantee
named below, subject to the vesting conditions set forth in the attachment.
Additional terms and conditions of the grant are set forth in this cover sheet,
in the attachment and in the Company's 1999 Stock Option and Incentive Plan (the
"Plan").

Grant Date:  _______ __, 200_

Name of Grantee:  ________________________________________

Number of Shares of Stock Covered by Grant:  _________________

Purchase Price per Share of Stock:  $.01

         By signing this cover sheet, you agree to all of the terms and
conditions described in the attached Agreement and in the Plan, a copy of which
is available from the Company upon request. You acknowledge that you have
carefully reviewed the Plan, and agree that the Plan will control in the event
any provision of this Agreement should appear to be inconsistent.

Grantee:      _____________________________________________________
                                  (Signature)

Company:      _____________________________________________________
                                  (Signature)

              Title: ______________________________________________

Attachment
----------

         This is not a stock certificate or a negotiable instrument.

<PAGE>

                               TREX COMPANY, INC.
                      1999 STOCK OPTION AND INCENTIVE PLAN

                           RESTRICTED STOCK AGREEMENT

Restricted Stock/      This grant is an award of Stock in the number of shares
Nontransferability     set forth on the cover sheet, at the purchase price set
                       forth on the cover sheet, and subject to the vesting
                       conditions described below (the "Restricted Stock"). You
                       agree to pay the purchase price for the Restricted Stock
                       concurrently with your execution of this agreement. To
                       the extent not yet vested, your Restricted Stock may not
                       be transferred, assigned, pledged or hypothecated,
                       whether by operation of law or otherwise, nor may the
                       Restricted Stock be made subject to execution, attachment
                       or similar process.

Issuance and Vesting   The Company will issue your Restricted Stock in your name
                       as of the Grant Date.

                       Your right to the Stock under this Restricted Stock grant
                       will vest as to one third (1/3) of the total number of
                       shares covered by this grant, as shown on the cover
                       sheet, on March __, 2005, March __, 2006, and March __,
                       2007; provided, that, you remain a Service Provider on
                       each such vesting date. The resulting aggregate number of
                       vested shares of Stock will be rounded to the nearest
                       whole number, and you may not vest in more than the
                       number of shares covered by this grant.

                       No additional shares of Stock will vest after you have
                       ceased to be a Service Provider for any reason.

Right of Repurchase    In the event that you cease to be a Service Provider for
for Unvested Stock     any reason, the Company shall have the right to purchase
                       all of the shares of Stock subject to this grant that
                       have not yet vested (the "Repurchase Right"). If the
                       Company fails to purchase such Stock within 90 days after
                       the effective date of your termination as a Service
                       Provider, the Company's right to purchase such Stock
                       shall terminate. The purchase price for any Stock
                       repurchased shall be the price that you paid for those
                       shares of Stock and shall be paid in immediately
                       available funds.

Escrow                 The certificates for the Restricted Stock shall be
                       deposited in escrow with the Secretary of the Company to
                       be held in accordance with the provisions of this
                       paragraph. Each deposited certificate shall be
                       accompanied by a duly executed Assignment Separate from
                       Certificate in the form attached hereto as Exhibit A. The
                                                                  ---------
                       deposited certificates shall remain in

                                        2

<PAGE>

                       escrow until such time or times as the certificates are
                       to be released or otherwise surrendered for cancellation
                       as discussed below. Upon delivery of the certificates to
                       the Company, you shall be issued an instrument of deposit
                       acknowledging the number of shares of Stock delivered in
                       escrow to the Secretary of the Company.

                       All regular cash dividends on the Stock (or other
                       securities at the time held in escrow) shall be paid
                       directly to you and shall not be held in escrow. However,
                       in the event of any stock dividend, stock split,
                       recapitalization or other change affecting the Stock as a
                       class effected without receipt of consideration, or in
                       the event of a stock split, a stock dividend or a similar
                       change in the Stock, any new, substituted or additional
                       securities or other property which is by reason of such
                       transaction distributed with respect to the Stock shall
                       be immediately delivered to the Secretary of the Company
                       to be held in escrow hereunder, but only to the extent
                       the Stock is at the time subject to the escrow
                       requirements hereof.

                       The shares of Stock held in escrow hereunder shall be
                       subject to the following terms and conditions relating to
                       their release from escrow or their surrender to the
                       Company for repurchase and cancellation:

                       .  As your interest in the shares vests as described
                          above, the certificates for such vested shares shall
                          be released from escrow and delivered to you, at your
                          request.

                       .  Should the Company exercise its Repurchase Right with
                          respect to any unvested shares held at the time in
                          escrow hereunder, then the escrowed certificates for
                          such unvested shares shall, concurrently with the
                          payment by the Company of the purchase price for such
                          shares of Stock, be surrendered to the Company for
                          cancellation, and you shall have no further rights
                          with respect to such shares of Stock.

                       .  Should the Company elect not to exercise its
                          Repurchase Right with respect to any shares held at
                          the time in escrow hereunder, then the escrowed
                          certificates for such shares shall be surrendered to
                          you.

Withholding Taxes      You agree, as a condition of this grant, that you will
                       make acceptable arrangements to pay any withholding or
                       other taxes that may be due as a result of the vesting of
                       Stock acquired under this grant. In the event that the
                       Company determines that

                                        3

<PAGE>

                       any federal, state, local or foreign tax or withholding
                       payment is required relating to the vesting of shares
                       arising from this grant, the Company shall have the right
                       to require such payments from you, or withhold such
                       amounts from other payments due to you from the Company
                       or any Affiliate.

Section 83(b)          Under Section 83 of the Internal Revenue Code of 1986, as
Election               amended (the "Code"), the difference between the purchase
                       price paid for the shares of Stock and their fair market
                       value on the date any forfeiture restrictions applicable
                       to such shares lapse will be reportable as ordinary
                       income at that time. For this purpose, "forfeiture
                       restrictions" include the Company's Repurchase Right as
                       to unvested Stock described above. You may elect to be
                       taxed at the time the shares are acquired rather than
                       when such shares cease to be subject to such forfeiture
                       restrictions by filing an election under Section 83(b) of
                       the Code with the Internal Revenue Service within thirty
                       (30) days after the Grant Date. You will have to make a
                       tax payment to the extent the purchase price is less than
                       the fair market value of the shares on the Grant Date. No
                       tax payment will have to be made to the extent the
                       purchase price is at least equal to the fair market value
                       of the shares on the Grant Date. The form for making this
                       election is attached as Exhibit B hereto. Failure to make
                                               ---------
                       this filing within the thirty (30) day period will result
                       in the recognition of ordinary income by you (in the
                       event the fair market value of the shares increases after
                       the date of purchase) as the forfeiture restrictions
                       lapse.

                       YOU ACKNOWLEDGE THAT IT IS YOUR SOLE RESPONSIBILITY, AND
                       NOT THE COMPANY'S, TO FILE A TIMELY ELECTION UNDER
                       SECTION 83(b), EVEN IF YOU REQUEST THE COMPANY OR ITS
                       REPRESENTATIVES TO MAKE THIS FILING ON YOUR BEHALF. YOU
                       ARE RELYING SOLELY ON YOUR OWN ADVISORS WITH RESPECT TO
                       THE DECISION AS TO WHETHER OR NOT TO FILE ANY 83(b)
                       ELECTION.

Retention Rights       This Agreement does not give you the right to be retained
                       by the Company in any capacity. The Company reserves the
                       right to terminate your service with the Company at any
                       time and for any reason.

Shareholder Rights     You shall have the right to vote the Restricted Stock
                       and, subject to the provisions of this Agreement, to
                       receive any dividends declared or paid on such stock. Any
                       distributions you receive as a result of any stock split,
                       stock dividend, combination of shares

                                       4

<PAGE>

                       or other similar transaction shall be deemed to be a part
                       of the Restricted Stock and subject to the same
                       conditions and restrictions applicable thereto. The
                       Company may in its sole discretion require any dividends
                       paid on the Restricted Stock to be reinvested in shares
                       of Stock, which the Company may in its sole discretion
                       deem to be a part of the shares of Restricted Stock and
                       subject to the same conditions and restrictions
                       applicable thereto. Except as described in the Plan, no
                       adjustments are made for dividends or other rights if the
                       applicable record date occurs before your stock
                       certificate is issued.

Adjustments            In the event of a stock split, a stock dividend or a
                       similar change in the Stock, the number of shares covered
                       by this grant may be adjusted (and rounded down to the
                       nearest whole number) pursuant to the Plan. Your
                       Restricted Stock shall be subject to the terms of the
                       agreement of merger, liquidation or reorganization in the
                       event the Company is subject to such corporate activity.

Legends                All certificates representing the Stock issued in
                       connection with this grant shall, where applicable, have
                       endorsed thereon the following legend:

                         "THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT
                         TO CERTAIN RESTRICTIONS ON TRANSFER AND OPTIONS TO
                         PURCHASE SUCH SHARES SET FORTH IN AN AGREEMENT BETWEEN
                         THE COMPANY AND THE REGISTERED HOLDER, OR THE HOLDER'S
                         PREDECESSOR IN INTEREST. A COPY OF SUCH AGREEMENT IS ON
                         FILE AT THE PRINCIPAL OFFICE OF THE COMPANY AND WILL BE
                         FURNISHED UPON WRITTEN REQUEST TO THE SECRETARY OF THE
                         COMPANY BY THE HOLDER OF RECORD OF THE SHARES
                         REPRESENTED BY THIS CERTIFICATE."

Applicable Law         This Agreement will be interpreted and enforced under the
                       laws of the State of Delaware, other than any conflicts
                       or choice of law rule or principle that might otherwise
                       refer construction or interpretation of this Agreement to
                       the substantive law of another jurisdiction.

The Plan               The text of the Plan is incorporated in this Agreement by
                       reference. Certain capitalized terms used in this
                       Agreement are defined in the Plan, and have the meaning
                       set forth in the Plan.

                       This Agreement and the Plan constitute the entire
                       understanding

                                        5

<PAGE>

                       between you and the Company regarding this grant of
                       Restricted Stock. Any prior agreements, commitments or
                       negotiations concerning this grant are superseded.

         By signing the cover sheet of this Agreement, you agree to all of the
terms and conditions described above and in the Plan.

                                       6

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