<PAGE>

                                                                   Exhibit 10.13

                              EMPLOYMENT AGREEMENT

                               (Raymond E. Wirta)

               EMPLOYMENT AGREEMENT (the "Agreement") dated as of July 20, 2001
by and between CB Richard Ellis Services, Inc. (the "Company") and Raymond E.
Wirta ("Executive").

               WHEREAS, the Company, CBRE Holding, Inc. and BLUM CB Corp has
entered into an Amended and Restated Agreement and Plan of Merger (the "Merger
Agreement") pursuant to which BLUM CB Corp will be merged with and into the
Company (the "Merger"); and

               WHEREAS, the Company desires that, upon the consummation of the
Merger, Executive continue to be employed by the Company and Executive enter
into an agreement embodying the terms of such employment and Executive desires
to continue such employment with the Company and enter into such an agreement;

               NOW, THEREFORE, in consideration of the premises and mutual
covenants herein and for other good and valuable consideration, the parties
agree as follows:

               1.   Term of Employment.
                    ------------------

                    a. Effectiveness. This Agreement shall constitute a binding
                       -------------
agreement between the parties as of the date hereof; provided, that,
notwithstanding any other provision of this Agreement, the operative provisions
of this Agreement shall become effective only upon the Effective Time (as
defined in the Merger Agreement) (such date being hereinafter referred to as the
"Effective Date"), at which time, this Agreement shall constitute a binding
obligation of the Company. In the event the Merger Agreement is terminated for
any reason without the Effective Date having occurred, this Agreement shall be
terminated without further obligation or liability of either party.

                    b. Term of Employment. Subject to the provisions of Section
                       ------------------
8 of this Agreement, Executive shall be employed by the Company for a period
commencing on Effective Date and ending on the third anniversary of the
Effective Date (the "Employment Term") on the terms and subject to the
conditions set forth in this Agreement; provided, however, that commencing with
                                        --------  -------
the first day following the third anniversary of the Effective Date and on each
anniversary of such day thereafter (each an "Extension Date"), the Employment
Term shall be automatically extended for an additional twelve month period,
unless the Company or Executive provides the other party hereto at least 120
days prior written notice before the next Extension Date that the Employment
Term shall not be so extended.

               2.   Position.
                    --------

                    a. During the Employment Term, Executive shall serve as the
Company's Chief Executive Officer. In such position, Executive shall have such
duties and authority, at least as broad as the duties and authority Executive
had immediately prior to the


<PAGE>

                                                                               2

Effective Date and consistent with other privately held companies similar to the
Company, as shall be determined from time to time by the Board of Directors of
the Company (the "Board"). If requested, Executive shall also serve as a member
of the Board without additional compensation.

                    b.    During the Employment Term, Executive will devote
Executive's full business time and best efforts to the performance of
Executive's duties hereunder and will not engage in any other business,
profession or occupation for compensation or otherwise which would conflict or
interfere with the rendition of such services either directly or indirectly,
without the prior written consent of the Board; provided that nothing herein
                                                --------
shall preclude Executive, subject to the prior approval of the Board, from
accepting appointment to or continue to serve on any board of directors or
trustees of any business corporation or any charitable organization; provided
                                                                     --------
that in each case, and in the aggregate, such activities do not conflict or
interfere with the performance of Executive's duties hereunder or conflict with
Section 8.

               3.   Base Salary. During the Employment Term, the Company shall
                    -----------
pay Executive a base salary at the annual rate of $519,000, payable in regular
installments in accordance with the Company's usual payment practices. Executive
shall be entitled to such increases in Executive's base salary, if any, as may
be determined from time to time in the sole discretion of the Board. Executive's
annual base salary, as in effect from time to time, is hereinafter referred to
as the "Base Salary."

               4.   Annual Bonus. With respect to each fiscal year during the
                    ------------
Employment Term, Executive shall be eligible to earn an annual bonus award (an
"Annual Bonus") of up to 200 percent (200%) of Executive's bonus target, as
determined by the Board (the bonus target for fiscal year 2001 shall equal
$900,000) (the "Target") based upon the achievement of annual performance
targets established by the Board, within the first three months of each fiscal
year during the Employment Term. The Annual Bonus for the fiscal year 2001 shall
be based on the Company's performance for the full fiscal year and shall be
determined in accordance with the methodology applied to the annual bonus
received by Executive for the fiscal year 2000.

               5.   Benefits.
                    --------

                    a.    Employee Benefits. During the Employment Term,
                          -----------------
Executive shall be provided health, life and disability insurance and retirement
and fringe benefits on the same basis as those benefits are generally made
available to other senior executives of the Company.



<PAGE>

                  b.   Loans. Subject to Executive's continued employment with
                       -----
the Company, in the event that the Shares are not readily tradable on a national
securities exchange or over the counter market immediately prior to the
expiration of the option held by Executive, as of the date hereof, to acquire
Shares owned by Donald Koll (the "Koll Option"), the Executive shall be entitled
to a loan from the Company of up to $3 million (the "Option Loan"), on a full
recourse basis, to exercise such option; provided, however, that Executive shall
                                         -----------------
be entitled to the Option Loan if Executive's employment was terminated by the
Company without Cause or by Executive for Good Reason prior to the expiration
date of the Koll Option. The Option Loan shall become repayable upon the
earliest to occur of (x) ninety (90) days following the termination of
Executive's employment with the Company (other than by the Company without Cause
or by Executive for Good Reason), (y) seven months following the date the Shares
become readily tradable on a national securities exchange or over the counter
market and (z) the sale of the Shares. The Option Loan shall bear interest at
the prime rate in effect on the date of Option Loan, compounded annually, and
will be repayable to the extent of any net after tax proceeds received by
Executive upon the sale of any Shares purchased with the Option Loan or upon
exercise of stock options granted to the Executive by the Company. Unless the
Shares received upon the exercise of the Koll Option have been pledged to the
Company by Executive as security for a loan by the Company to the Executive
other than the Option Loan (an "Other Loan"), Executive shall pledge the Shares
received upon exercise of the Koll Option as security for the Option Loan. In
the event that the Shares received upon the exercise of the Koll Option are
pledged to the Company by Executive as security for an Other Loan, upon the
release of such Shares as security for such Other Loan, Executive agrees to
immediately pledge such Shares to the Company as security for the Option Loan.

          6.      Business Expenses. During the Employment Term, reasonable
                  -----------------
business expenses incurred by Executive in the performance of Executive's duties
hereunder shall be reimbursed by the Company in accordance with Company
policies.

          7.      Termination. The Employment Term and Executive's employment
                  -----------
hereunder may be terminated by either party at any time and for any reason;
provided that Executive will be required to give the Company at least 60 days
--------
advance written notice of any resignation of Executive's employment.
Notwithstanding any other provision of this Agreement, the provisions of this
Section 7 shall exclusively govern Executive's rights upon termination of
employment with the Company and its affiliates.

                  a.   By the Company For Cause or By Executive Resignation
                       ----------------------------------------------------
Without Good Reason.
-------------------

             (i)  The Employment Term and Executive's employment hereunder may
be terminated by the Company for Cause (as defined below) and shall terminate
automatically upon Executive's resignation without Good Reason (as defined in
Section 7(c)).

             (ii) For purposes of this Agreement, "Cause" shall mean (A)
willful failure to perform duties hereunder (other than as a result of total or
partial incapacity due to physical or mental illness) for a period of 10 days
following written notice by the Company to Executive of such failure, (B)
conviction of a felony, (C) willful malfeasance or misconduct which is
materially and demonstrably injurious to the Company, or (D) breach by Executive
of the material terms of this Agreement including, without limitation, Sections
8 and 9 of this Agreement. For the purpose of the preceding sentence, clause (A)
only applies to the extent

<PAGE>

                                                                               4

Executive refuses to undertake the duties of Executive's office and does not
apply to situations where, although Executive is undertaking the duties of
Executive's office to the best of Executive's ability in good faith, a
disagreement exists with regard to the quality of the services rendered by
Executive; provided further that, no act or failure to act shall be considered
           --------
"willful" unless it is done, or omitted to be done, in bad faith without a
reasonable belief that the action or omission was in the best interests of the
Company.

               (iii) If Executive's employment is terminated by the Company for
Cause, or if Executive resigns without Good Reason, Executive shall be entitled
to receive:

                     (A) the Base Salary through the date of termination;

                     (B) any Annual Bonus earned but unpaid as of the date of
         termination for any previously completed fiscal year;

                     (C) reimbursement for any unreimbursed business expenses
         properly incurred by Executive in accordance with Company policy prior
         to the date of Executive's termination; and

                     (D) such employee benefits, if any, as to which Executive
         may be entitled under the employee benefit plans of the Company (the
         amounts described in clauses (A) through (D) hereof being referred to
         as the "Accrued Rights").

            Following such termination of Executive's employment by the Company
for Cause or resignation by Executive without Good Reason, except as set forth
in this Section 7(a)(iii), Executive shall have no further rights to any
compensation or any other benefits under this Agreement.

                     b.  Disability or Death.
                         -------------------

               (i)   The Employment Term and Executive's employment hereunder
shall terminate upon Executive's death and may be terminated by the Company if
Executive becomes physically or mentally incapacitated and is therefore unable
for a period of six (6) consecutive months or for an aggregate of nine (9)
months in any twenty-four (24) consecutive month period to perform Executive's
duties (such incapacity is hereinafter referred to as "Disability"). Any
question as to the existence of the Disability of Executive as to which
Executive and the Company cannot agree shall be determined in writing by a
qualified independent physician mutually acceptable to Executive and the
Company. If Executive and the Company cannot agree as to a qualified independent
physician, each shall appoint such a physician and those two physicians shall
select a third who shall make such determination in writing. The determination
of Disability made in writing to the Company and Executive shall be final and
conclusive for all purposes of the Agreement.

               (ii)  Upon termination of Executive's employment hereunder for
either Disability or death, Executive or Executive's estate (as the case may be)
shall be entitled to receive:

                     (A) the Accrued Rights; and


<PAGE>

                                                                               5

                     (B)  a pro rata portion of any Annual Bonus, if any, that
           Executive would have been entitled to receive pursuant to Section 4
           of this Agreement in such year (i) based upon the percentage of the
           fiscal year that shall have elapsed through the date of Executive's
           termination of employment and (ii) to the extent payment of the
           Annual Bonus is based upon subjective individual performance
           criteria, based upon the actual performance of Executive during the
           portion of such fiscal year that Executive was employed by the
           Company prior to such death or Disability, payable when such Annual
           Bonus would have otherwise been payable had Executive's employment
           not terminated (the "Prorated Termination Bonus").

                  Following Executive's termination of employment due to death
or Disability, except as set forth in this Section 7(b)(ii), Executive shall
have no further rights to any compensation or any other benefits under this
Agreement.

                     c.   By the Company Without Cause or Resignation by
                          ----------------------------------------------
Executive for Good Reason.
-------------------------

               (i)   The Employment Term and Executive's employment hereunder
may be terminated by the Company without Cause (other than due to death or
Disability) or by Executive's resignation for Good Reason (in each case, a
"Qualifying Termination").

               (ii)  For purposes of this Agreement, "Good Reason" shall mean
(A) a substantial diminution in Executive's position or duties, adverse changes
in reporting lines, or assignment of duties materially inconsistent with
Executive's position, (B) any reduction in Executive's Base Salary or material
adverse change in Executive's Annual Bonus opportunity (C) failure of the
Company to pay compensation or benefits when due under the Agreement or (D) a
requirement by the Company that Executive relocate his principal office greater
than 50 miles from his principal office as of the date hereof, in each case
which is not cured within 30 days following the Company's receipt of written
notice from the Senior Manager describing the event constituting Good Reason.

               (iii) If Executive's employment is terminated in a Qualifying
Termination, Executive shall be entitled to receive:

                     (A)  the Accrued Rights; and

                     (B)  subject to Executive's continued compliance with the
           provisions of Sections 9 and 10, continued payment of the Base Salary
           and average Annual Bonus (based upon the previous two fiscal years)
           for a period of two years (the "Severance Period"), such payment to
           be made on substantially the same periodic basis as payments of Base
           Salary to Executive were made immediately prior to the Qualifying
           Termination; and

                     (C)  continued coverage under the Company's medical plans
           on the same basis as the Company's actively employed executives until
           the earlier of (x) the expiration of the Severance Period and (y) the
           date Executive becomes eligible for comparable (or better) coverage
           under any successor employer's medical plan.



<PAGE>

                                                                               6

               The Company's payment obligations under Section 7(c)(iii)(B)
shall not be contingent on any attempt by Executive to obtain other employment
and shall continue, subject to the provisions of Section 8, notwithstanding
Executive's employment following a Qualifying Termination. Following a
Qualifying Termination, except as set forth in this Section 7(c)(iii), Executive
shall have no further rights to any compensation or any other benefits under
this Agreement. In addition, the severance provided under this Section 7(c)(iii)
contains the exclusive source of severance for Executive and Executive shall not
be entitled to any severance payments under any severance plans, programs,
arrangements or agreements maintained by the Company or its affiliates.

                        d.  Expiration of Employment Term.
                            -----------------------------

                   (i)  Election Not to Extend the Employment Term. In the event
                        ------------------------------------------
either party elects not to extend the Employment Term pursuant to Section 1 of
this Agreement, unless Executive's employment is earlier terminated pursuant to
paragraphs (a), (b) or (c) of this Section 7, Executive's termination of
employment hereunder (whether or not Executive continues as an employee of the
Company thereafter) shall be deemed to occur on the close of business on the day
immediately preceding the next scheduled Extension Date and, unless Executive
continues as an employee of the Company, Executive shall be entitled to receive
the Accrued Rights and the Prorated Termination Bonus as soon as practicable
following such termination.

               Following such termination of Executive's employment hereunder as
a result of either party's election not to extend the Employment Term, except as
set forth in this Section 7(d)(i), Executive shall have no further rights to any
compensation or any other benefits under this Agreement.

                   (ii) Continued Employment Beyond the Expiration of the
                        -------------------------------------------------
Employment Term. Unless the parties otherwise agree in writing, continuation of
---------------
Executive's employment with the Company beyond the expiration of the Employment
Term shall be deemed an employment at-will and shall not be deemed to extend any
of the provisions of this Agreement and Executive's employment may thereafter be
terminated at will by either Executive or the Company; provided that the
                                                       --------
provisions of Sections 8, 9 and 10 of this Agreement shall survive any
termination of this Agreement or Executive's termination of employment
hereunder.

                        e.  Notice of Termination. Any purported termination of
                            ---------------------
employment by the Company or by Executive (other than due to Executive's death)
shall be communicated by written Notice of Termination to the other party hereto
in accordance with Section 11(g) of this Agreement. For purposes of this
Agreement, a "Notice of Termination" shall mean a notice which shall indicate
the specific termination provision in this Agreement relied upon and shall set
forth in reasonable detail the facts and circumstances claimed to provide a
basis for termination of employment under the provision so indicated.

                        f.  Board/Committee Resignation. Upon termination of
                            ---------------------------
Executive's employment for any reason, Executive agrees to resign, as of the
date of such termination and to the extent applicable, from the Board (and any
committees thereof) and the Board of Directors (and any committees thereof) of
any of the Company's affiliates.


<PAGE>

                                                                               7


         8.  Non-Competition.
             ---------------

             a.    Executive acknowledges and recognizes the highly competitive
nature of the businesses of the Company and its affiliates and accordingly
agrees as follows:

         (1) During the Employment Term and, for a period of two years following
the date Executive ceases to be employed by the Company (the "Restricted
Period"), provided that Executive has ceased to be employed pursuant to a
Qualifying Termination, Executive will not, whether on Executive's own behalf or
on behalf of or in conjunction with any person, company, business entity or
other organization whatsoever, directly or indirectly solicit or assist in
soliciting in competition with the Company, the business of any client or
prospective client:

             (i)   with whom Executive had personal contact or dealings on
                   behalf of the Company during the one year period preceding
                   Executive's termination of employment;

             (ii)  with whom employees reporting to Executive have had personal
                   contact or dealings on behalf of the Company during the one
                   year immediately preceding the Executive's termination of
                   employment; or

             (iii) for whom Executive had direct or indirect responsibility
                   during the one year immediately preceding Executive's
                   termination of employment.

         (2) During the Restricted Period, provided that Executive has ceased to
be employed pursuant to a Qualifying Termination, Executive will not directly or
indirectly:

             (i)   engage in any business that competes with the business of the
                   Company or its controlled affiliates (including, without
                   limitation, businesses which the Company or its controlled
                   affiliates have specific plans to conduct in the future and
                   as to which Executive is aware of such planning) in any
                   geographical area that is within 100 miles of any
                   geographical area where the Company or its controlled
                   affiliates manufactures, produces, sells, leases, rents,
                   licenses or otherwise provides its products or services (a
                   "Competitive Business");

             (ii)  enter the employ of, or render any services to, any person or
                   entity (or any division of any person or entity) who or which
                   engages in a Competitive Business;

             (iii) acquire a financial interest in, or otherwise become actively
                   involved with, any Competitive Business, directly or
                   indirectly, as an individual, partner, shareholder, officer,
                   director, principal, agent, trustee or consultant; or

             (iv)  interfere with, or attempt to interfere with, business
                   relationships (whether formed before, on or after the date of
                   this Agreement)

<PAGE>

                                                                               8


                   between the Company or any of its affiliates and customers,
                   clients, suppliers, partners, members or investors of the
                   Company or its affiliates.

          (3) Notwithstanding anything to the contrary in this Agreement,
Executive may, (x) directly or indirectly own, solely as an investment,
securities of any person engaged in the business of the Company or its
affiliates which are publicly traded on a national or regional stock exchange or
on the over-the-counter market if Executive (i) is not a controlling person of,
or a member of a group which controls, such person and (ii) does not, directly
or indirectly, own 5% or more of any class of securities of such person and (y)
continue during the Employment Term and the Restricted Period to participate in
any business participated in by Executive as of the date hereof and listed on
Exhibit A which is or may in the future be a Competitive Business, in a manner
consistent with Executive's participation in such business as of the date
hereof.

          (4) During the Restricted Period, Executive will not, whether on
Executive's own behalf or on behalf of or in conjunction with any person,
company, business entity or other organization whatsoever, directly or
indirectly:

              (i)  solicit or encourage any employee of the Company or its
                   affiliates to leave the employment of the Company or its
                   affiliates; or

              (ii) hire any such employee who was employed by the Company or its
                   affiliates as of the date of Executive's termination of
                   employment with the Company or who left the employment of the
                   Company or its affiliates coincident with, or within one year
                   prior to or after, the termination of Executive's employment
                   with the Company.

          (5) During the Restricted Period, Executive will not, directly or
indirectly, solicit or encourage to cease to work with the Company or its
affiliates any consultant then under contract with the Company or its
affiliates.

              b.   It is expressly understood and agreed that although Executive
and the Company consider the restrictions contained in this Section 8 to be
reasonable, if a final judicial determination is made by a court of competent
jurisdiction that the time or territory or any other restriction contained in
this Agreement is an unenforceable restriction against Executive, the provisions
of this Agreement shall not be rendered void but shall be deemed amended to
apply as to such maximum time and territory and to such maximum extent as such
court may judicially determine or indicate to be enforceable. Alternatively, if
any court of competent jurisdiction finds that any restriction contained in this
Agreement is unenforceable, and such restriction cannot be amended so as to make
it enforceable, such finding shall not affect the enforceability of any of the
other restrictions contained herein.

          9.  Confidentiality. Executive will not at any time (whether during or
              ---------------
after Executive's employment with the Company) disclose, retain, or use for
Executive's own benefit, purposes or account or the benefit, purposes or account
of any other person, firm, partnership, joint venture, association, corporation
or other business organization, entity or enterprise other than the Company and
any of its subsidiaries or affiliates, any trade secrets, know-how, software
developments, inventions, formulae, technology, designs and drawings, or any
Company

<PAGE>

                                                                               9


property or confidential information relating to research, operations, finances,
current and proposed products and services, vendors, customers, advertising,
costs, marketing, trading, investment, sales activities, promotion,
manufacturing processes, or the business and affairs of the Company generally,
or of any subsidiary or affiliate of the Company ("Confidential Information")
without the written authorization of the Board; provided that the foregoing
                                                --------
shall not apply to information which is not unique to the Company or which is
generally known to the industry or the public other than as a result of
Executive's breach of this covenant or the wrongful acts of others who were
under confidentiality obligations as to the item or items involved. Except as
required by law, Executive will not disclose to anyone, other than Executive's
immediate family and legal or financial advisors, the existence or contents of
this Agreement; provided that Executive may disclose to any prospective future
                --------
employer the provisions of Sections 8 and 9 of this Agreement provided they
agree to maintain the confidentiality of such terms. Executive agrees that upon
termination of Executive's employment with the Company for any reason, Executive
will return to the Company immediately all memoranda, books, papers, plans,
information, letters and other data, and all copies thereof or therefrom, in any
way relating to the business of the Company, its affiliates and subsidiaries,
except that Executive may retain only those portions of personal notes,
notebooks and diaries that do not contain Confidential Information of the type
described in the preceding sentence. Executive further agrees that Executive
will not retain or use for Executive's own benefit, purposes or account or the
benefit, purposes or account of any other person, firm, partnership, joint
venture, association, corporation or other business designation, entity or
enterprise, other than the Company and any of its subsidiaries or affiliates, at
any time any trade names, trademark, service mark, other proprietary business
designation, patent, or other intellectual property used or owned in connection
with the business of the Company or its affiliates.

          10. Specific Performance. Executive acknowledges and agrees that the
              --------------------
Company's remedies at law for a breach or threatened breach of any of the
provisions of Sections 8 or 9 would be inadequate and the Company would suffer
irreparable damages as a result of such breach or threatened breach. In
recognition of this fact, Executive agrees that, in the event of such a breach
or threatened breach, in addition to any remedies at law, the Company, without
posting any bond, shall be entitled to cease making any payments or providing
any benefit otherwise required by this Agreement and obtain equitable relief in
the form of specific performance, temporary restraining order, temporary or
permanent injunction or any other equitable remedy which may then be available.

          11. Miscellaneous.
              -------------

              a. Governing Law. This Agreement shall be governed by and
                 -------------
construed in accordance with the laws of the State of New York, without regard
to conflicts of laws principles thereof.

              b. Entire Agreement/Amendments. This Agreement contains the entire
                 ---------------------------
understanding of the parties with respect to the employment of Executive by the
Company. There are no restrictions, agreements, promises, warranties, covenants
or undertakings between the parties with respect to the subject matter herein
other than those expressly set forth herein. This Agreement may not be altered,
modified, or amended except by written instrument signed by the parties hereto.

<PAGE>

                                                                              10


              c. No Waiver. The failure of a party to insist upon strict
                 ---------
adherence to any term of this Agreement on any occasion shall not be considered
a waiver of such party's rights or deprive such party of the right thereafter to
insist upon strict adherence to that term or any other term of this Agreement.

              d. Severability. In the event that any one or more of the
                 ------------
provisions of this Agreement shall be or become invalid, illegal or
unenforceable in any respect, the validity, legality and enforceability of the
remaining provisions of this Agreement shall not be affected thereby.

              e. Assignment. This Agreement shall not be assignable by
                 ----------
Executive. This Agreement may be assigned by the Company to a person or entity
which is an affiliate or a successor in interest to substantially all of the
business operations of the Company. Upon such assignment, the rights and
obligations of the Company hereunder shall become the rights and obligations of
such affiliate or successor person or entity.

              f. Successors; Binding Agreement. This Agreement shall inure to
                 -----------------------------
the benefit of and be binding upon the parties hereto and their respective
successors in interest.

              g. Notice. For the purpose of this Agreement, notices and all
                 ------
other communications provided for in the Agreement shall be in writing and shall
be deemed to have been duly given when delivered by hand or overnight courier or
three days after it has been mailed by United States registered mail, return
receipt requested, postage prepaid, addressed to the respective addresses set
forth below, or to such other address as either party may have furnished to the
other in writing in accordance herewith, except that notice of change of address
shall be effective only upon receipt.

         If to the Company:

         CB Richard Ellis Services, Inc.
         200 North Sepulveda Boulevard
         El Segundo, CA 90245
         Attention: General Counsel

         If to Executive:

         To the most recent address of Executive set forth in the personnel
records of the Company.

              h. Executive Representation. Executive hereby represents to the
                 ------------------------
Company that the execution and delivery of this Agreement by Executive and the
Company and the performance by Executive of Executive's duties hereunder shall
not constitute a breach of, or otherwise contravene, the terms of any employment
agreement or other agreement or policy to which Executive is a party or
otherwise bound.

              i. Prior Agreements. This Agreement supercedes all prior
                 ----------------
agreements and understandings (including verbal agreements) between Executive
and the Company and/or its affiliates regarding the terms and conditions of
Executive's employment with the Company and/or its affiliates.

<PAGE>

                                                                              11


              j. Cooperation. Executive shall provide Executive's reasonable
                 -----------
cooperation in connection with any action or proceeding (or any appeal from any
action or proceeding) which relates to events occurring during Executive's
employment hereunder. This provision shall survive any termination of this
Agreement.

              k. Withholding Taxes. The Company may withhold from any amounts
                 -----------------
payable under this Agreement such Federal, state and local taxes as may be
required to be withheld pursuant to any applicable law or regulation.

              l. Counterparts. This Agreement may be signed in counterparts,
                 ------------
each of which shall be an original, with the same effect as if the signatures
thereto and hereto were upon the same instrument.

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have duly executed this
Agreement as of the day and year first above written.

                                      CB RICHARD ELLIS SERVICES, INC.



                                             /s/ Walter V. Stafford
                                      -----------------------------------------
                                      By:    Walter V. Stafford
                                             ----------------------------------
                                      Title: Senior Executive Vice President
                                             ----------------------------------



                                      EXECUTIVE



                                       /s/ Raymond E. Wirta
                                      -----------------------------------------
                                      Raymond E. Wirta