Form of Underwriting Agreement

1. Introductory. The stockholders listed in Schedule A hereto (each a “Selling Stockholder” and, collectively, the “Selling Stockholders”) propose severally to sell an aggregate of outstanding shares (“Firm Securities”) of the Class A Common Stock, $0.01 par value per share (“Securities”), of CB Richard Ellis Group, Inc., a Delaware corporation (the “Company”), with each Selling Stockholder selling the number of Firm Securities set forth opposite its or his name on Schedule A hereto. Certain of the Selling Stockholders also propose to sell to the Underwriters, at the option of the Underwriters, an aggregate of not more than additional outstanding shares of Securities, as set forth below (such additional shares being hereinafter referred to as the “Optional Securities”), with each Selling Stockholder selling up to the number of Optional Securities set forth opposite its or his name on Schedule C hereto. The Firm Securities and the Optional Securities are herein collectively called the “Offered Securities”. The Company and the Selling Stockholders hereby agree with the several Underwriters named in Schedule B hereto (the “Underwriters”) as follows:

2. Representations and Warranties of the Company, the Selling Stockholders and the Underwriters. (a) The Company represents and warrants to, and agrees with, the several Underwriters that:

(i) A registration statement (No. 333-120445) relating to the Offered Securities, including a form of prospectus, has been filed with the Securities and Exchange Commission (“Commission”) and either (A) has been declared effective under the Securities Act of 1933 (“Act”) and is not proposed to be amended or (B) is proposed to be amended by amendment or post-effective amendment. If such registration statement (the “initial registration statement”) has been declared effective, either (A) an additional registration statement (the “additional registration statement”) relating to the Offered Securities may have been filed with the Commission pursuant to Rule 462(b) (“Rule 462(b)”) under the Act and, if so filed, has become effective upon filing pursuant to such Rule and the Offered Securities all have been duly registered under the Act pursuant to the initial registration statement and, if applicable, the

additional registration statement or (B) such an additional registration statement is proposed to be filed with the Commission pursuant to Rule 462(b) and, if so filed, will become effective upon filing pursuant to such Rule and upon such filing the Offered Securities will all have been duly registered under the Act pursuant to the initial registration statement and such additional registration statement. If the Company does not propose to amend the initial registration statement or if an additional registration statement has been filed and the Company does not propose to amend it, and if any post-effective amendment to either such registration statement has been filed with the Commission prior to the execution and delivery of this Agreement, the most recent amendment (if any) to each such registration statement has been declared effective by the Commission or has become effective upon filing pursuant to Rule 462(c) (“Rule 462(c)”) under the Act or, in the case of the additional registration statement, Rule 462(b). For purposes of this Agreement, “Effective Time” with respect to the initial registration statement or, if filed prior to the execution and delivery of this Agreement, the additional registration statement means (A) if the Company has advised the Representatives that it does not propose to amend such registration statement, the date and time as of which such registration statement, or the most recent post-effective amendment thereto (if any) filed prior to the execution and delivery of this Agreement, was declared effective by the Commission or has become effective upon filing pursuant to Rule 462(c), or (B) if the Company has advised the Representatives that it proposes to file an amendment or post-effective amendment to such registration statement, the date and time as of which such registration statement, as amended by such amendment or post-effective amendment, as the case may be, is declared effective by the Commission. If an additional registration statement has not been filed prior to the execution and delivery of this Agreement but the Company has advised the Representatives that it proposes to file one, “Effective Time” with respect to such additional registration statement means the date and time as of which such registration statement is filed and becomes effective pursuant to Rule 462(b). “Effective Date” with respect to the initial registration statement or the additional registration statement (if any) means the date of the Effective Time thereof. The initial registration statement, as amended at its Effective Time, including all information contained in the additional registration statement (if any) and deemed to be a part of the initial registration statement as of the Effective Time of the additional registration statement pursuant to the General Instructions of the Form on which it is filed and including all information (if any) deemed to be a part of the initial registration statement as of its Effective Time pursuant to Rule 430A(b) (“Rule 430A(b)”) under the Act, is hereinafter referred to as the “Initial Registration Statement”. The additional registration statement, as amended at its Effective Time, including the contents of the initial registration statement incorporated by reference therein and including all information (if any) deemed to be a part of the additional registration statement as of its Effective Time pursuant to Rule 430A(b), is hereinafter referred to as the “Additional Registration Statement”. The Initial Registration Statement and the Additional Registration Statement are hereinafter referred to collectively as the “Registration Statements” and individually as a “Registration Statement”. The form of prospectus relating to the Offered Securities, as first filed with the Commission pursuant to and in accordance with Rule 424(b) (“Rule 424(b)”) under the Act or (if no such filing is required) as included in a Registration Statement, is hereinafter referred to as the “Prospectus”. No document has been or will be prepared or distributed in reliance on Rule 434 under the Act.

(ii) If the Effective Time of the Initial Registration Statement is prior to the execution and delivery of this Agreement: (A) on the Effective Date of the Initial Registration Statement, the Initial Registration Statement conformed in all material respects to the requirements of the Act and the rules and regulations of the Commission (“Rules and Regulations”) and did not include any untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary to make the statements therein not misleading, (B) on the Effective Date of the Additional Registration Statement (if any), each Registration Statement conformed or will conform, in all material respects to the requirements of the Act and the Rules and Regulations and did not include, or will not include, any untrue statement of a material fact and

did not omit, or will not omit, to state any material fact required to be stated therein or necessary to make the statements therein not misleading, and (C) on the date of this Agreement, the Initial Registration Statement and, if the Effective Time of the Additional Registration Statement is prior to the execution and delivery of this Agreement, the Additional Registration Statement each conforms, and at the time of filing of the Prospectus pursuant to Rule 424(b) or (if no such filing is required) at the Effective Date of the Additional Registration Statement in which the Prospectus is included, each Registration Statement and the Prospectus will conform, in all material respects to the requirements of the Act and the Rules and Regulations, and none of such documents includes, or will include, any untrue statement of a material fact or omits, or will omit, to state any material fact required to be stated therein or necessary to make the statements therein (in the case of the Prospectus, in the light of the circumstances under which they were made) not misleading. If the Effective Time of the Initial Registration Statement is subsequent to the execution and delivery of this Agreement: on the Effective Date of the Initial Registration Statement, the Initial Registration Statement and the Prospectus will conform in all material respects to the requirements of the Act and the Rules and Regulations, none of such documents will include any untrue statement of a material fact or will omit to state any material fact required to be stated therein or necessary to make the statements therein (in the case of the Prospectus, in the light of the circumstances under which they were made) not misleading, and no Additional Registration Statement has been or will be filed. This paragraph does not apply to statements in or omissions from a Registration Statement or the Prospectus based upon written information furnished to the Company by any Underwriter through the Representatives specifically for use therein, it being understood and agreed that the only such information is that described as such in Section 7(c) hereof. Except with respect to any provision regarding the conformity, in all material respects, of a Registration Statement or the Prospectus with the requirements of the Act and the Rules and Regulations, this paragraph does not apply to statements in or omissions from a Registration Statement or the Prospectus based upon written information furnished to the Company by any Selling Stockholder specifically for use therein, it being understood and agreed that the only such information is the Selling Stockholder Information (as defined below).

(iii) The Company has been duly incorporated and is an existing corporation in good standing under the laws of the State of Delaware, with corporate power and authority to own its properties and conduct its business as described in the Prospectus; and the Company is duly qualified to do business as a foreign corporation in good standing in all other jurisdictions in which its ownership or lease of property or the conduct of its business requires such qualification, except to the extent that the failure to be so qualified or to be in good standing would not have a material adverse effect on the business, financial condition or results of operations of the Company and its subsidiaries, taken as a whole (a “Material Adverse Effect”).

(iv) Each subsidiary of the Company has been duly formed and is an existing corporation, limited liability company or limited partnership, as the case may be, in good standing (if applicable) under the laws of the jurisdiction of its incorporation or organization, with corporate (or equivalent) power and authority to own its properties and conduct its business as described in the Prospectus; and each subsidiary of the Company is duly qualified to do business as a foreign corporation, limited liability company or limited partnership, as the case may be, in good standing (if applicable) in all other jurisdictions in which its ownership or lease of property or the conduct of its business requires such qualification, except to the extent that the failure to be so qualified or to be in good standing would not have a Material Adverse Effect; all of the issued and outstanding capital stock, ownership interests, or partnership interests, as the case may be, of each subsidiary of the Company has been duly authorized and validly issued and, in the case of capital stock, is fully paid and nonassessable; and except as disclosed in the Prospectus and for pledges in favor of Credit Suisse First Boston, as collateral agent under the amended and restated credit agreement dated as of April 23, 2004, among the Company, CB Richard Ellis Services, Inc., the Lenders (as defined therein) and Credit Suisse First Boston, as

administrative agent (as amended as of November 15, 2004 and as further amended from time to time, the “Credit Agreement”), the capital stock, ownership interests, or partnership interests, as the case may be, of each subsidiary owned by the Company, directly or through subsidiaries, is owned free from liens, encumbrances and defects.

(v) The Offered Securities and all other outstanding shares of capital stock of the Company have been duly authorized; all outstanding shares of capital stock of the Company are validly issued, fully paid and nonassessable and conform to the description thereof contained in the Prospectus; and, except as disclosed in the Prospectus, the stockholders of the Company have no preemptive rights with respect to the Securities.

(vi) Except as disclosed in the Prospectus, there are no contracts, agreements or understandings between the Company and any person that would give rise to a valid claim against the Company or any Underwriter for a brokerage commission, finder’s fee or other like payment in connection with the offering contemplated by this Agreement.

(vii) Except as disclosed in the Prospectus, there are no contracts, agreements or understandings between the Company and any person granting such person the right to require the Company to file a registration statement under the Act with respect to any securities of the Company owned or to be owned by such person or to require the Company to include such securities in the securities registered pursuant to a Registration Statement or in any securities being registered pursuant to any other registration statement filed by the Company under the Act that have not been satisfied or waived prior to the date hereof.

(ix) No consent, approval, authorization, or order of, or filing with, any governmental agency or body or any court is required to be obtained or made by the Company for the consummation of the transactions contemplated by this Agreement in connection with the sale of the Offered Securities by the Selling Stockholders, except such as have been obtained and made under the Act and such as may be required under any state or foreign securities laws.

(x) Assuming the accuracy of the representations of the other parties hereto and the performance by those parties of their agreements herein, the execution, delivery and performance of this Agreement, and the consummation of the transactions herein contemplated, will not result in a breach or violation of any of the terms and provisions of, or constitute a default under, (i) any statute, rule, regulation or order of any governmental agency or body or any court, domestic or foreign, that has jurisdiction over the Company or any of its subsidiaries or any of their properties, (ii) any agreement or instrument to which the Company or any of its subsidiaries is a party or by which the Company or any of its subsidiaries is bound or to which any of the properties of the Company or its subsidiaries is subject or (iii) the charter, by-laws or similar governing documents of the Company or any of its subsidiaries, except, with respect to clauses (i) and (ii), where such breach, violation or default would not have a Material Adverse Effect.

(xi) This Agreement has been duly authorized, executed and delivered by the Company.

(xii) Except as disclosed in the Prospectus, the Company and its subsidiaries have good and marketable title to all real properties and all other properties and assets owned by them that are material to the Company and its subsidiaries, taken as a whole, in each case free from liens, encumbrances and defects that would materially affect the value thereof or materially interfere with the use made or proposed to be made thereof by them; and except as disclosed in the Prospectus, the Company and its subsidiaries hold any leased real or personal property that is material to the Company and its subsidiaries taken as a whole under valid and enforceable leases

with no exceptions that would materially interfere with the use made or proposed to be made thereof by them.

(xiii) The Company and its subsidiaries possess adequate certificates, authorities or permits issued by appropriate governmental agencies or bodies necessary to conduct the business now operated by them and have not received any notice of proceedings relating to the revocation or modification of any such certificate, authority or permit that, if determined adversely to the Company or any of its subsidiaries, would individually or in the aggregate have a Material Adverse Effect.

(xiv) No labor dispute with the employees of the Company or any subsidiary exists or, to the knowledge of the Company, is imminent that would reasonably be expected to have a Material Adverse Effect.

(xv) The Company and its subsidiaries own, possess or can acquire on reasonable terms, adequate trademarks, trade names and other rights to inventions, know-how, patents, copyrights, confidential information and other intellectual property (collectively, “intellectual property rights”) necessary to conduct the business now operated by them, or presently employed by them, and have not received any notice of infringement of or conflict with asserted rights of others with respect to any intellectual property rights that, if determined adversely to the Company or any of its subsidiaries, would individually or in the aggregate have a Material Adverse Effect.

(xvi) Except as disclosed in the Prospectus, neither the Company nor any of its subsidiaries is in violation of any statute, rule, regulation, decision or order of any governmental agency or body or any court, domestic or foreign, relating to the use, disposal or release of hazardous or toxic substances or relating to the protection or restoration of the environment or human exposure to hazardous or toxic substances (collectively, “environmental laws”), owns or operates any real property contaminated with any substance that is subject to any environmental laws, is liable for any off-site disposal or contamination pursuant to any environmental laws, or is subject to any claim relating to any environmental laws, which violation, contamination, liability or claim would individually or in the aggregate have a Material Adverse Effect; and the Company is not aware of any pending investigation which might lead to such a claim.

(xvii) Except as disclosed in the Prospectus, there are no pending actions, suits or proceedings against or affecting the Company, any of its subsidiaries or any of their respective properties that (i) if determined adversely to the Company or any of its subsidiaries, would individually or in the aggregate have a Material Adverse Effect, (ii) would materially and adversely affect the ability of the Company or its subsidiaries to perform their respective obligations under this Agreement or (iii) are otherwise material in the context of the sale of the Offered Securities; and no such actions, suits or proceedings are, to the knowledge of the Company, threatened or contemplated.

(xviii) The historical financial statements included in each Registration Statement and the Prospectus present fairly the financial position of the Company and its consolidated subsidiaries as of the dates shown and their results of operations and cash flows for the periods shown, and such financial statements have been prepared in conformity with the generally accepted accounting principles in the United States (“GAAP”) applied on a consistent basis (subject to normal year-end adjustments and the absence of certain footnotes, to the extent permitted by GAAP, in the case of any unaudited interim financial statements); the historical financial statements included in each Registration Statement and the Prospectus fairly present the financial position of Insignia Financial Group, Inc. and its consolidated subsidiaries as of the dates shown and their results of operations and cash flows for the periods shown, and such financial statements have been prepared in conformity with GAAP applied on a consistent basis

(xix) Each of the Company and its subsidiaries maintain a system of internal accounting controls sufficient to provide reasonable assurance that (i) transactions are executed in accordance with management’s general or specific authorizations; (ii) transactions are recorded as necessary to permit preparation of financial statements in conformity with generally accepted accounting principles and to maintain asset accountability; (iii) access to assets is permitted only in accordance with management’s general or specific authorization; and (iv) the recorded accountability for assets is compared with the existing assets at reasonable intervals and appropriate action is taken with respect to any differences. The Company maintains disclosure controls and procedures (as such term is defined in Rule 13a-14 under the Securities Exchange Act of 1934 (the “Exchange Act”)) that are effective in ensuring that information required to be disclosed by the Company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the rules and forms of the Commission, including, without limitation, controls and procedures designed to ensure that information required to be disclosed by the Company in the reports that it files or submits under the Exchange Act is accumulated and communicated to the Company’s management, including its principal executive officer or officers and its principal financial officer or officers, as appropriate to allow timely decisions regarding required disclosure.

(xx) Except as disclosed in the Prospectus, since the date of the latest audited financial statements of the Company included in the Prospectus there has been no material adverse change, nor any development or event involving a prospective material adverse change, in the financial condition, business, properties or results of operations of the Company and its subsidiaries taken as a whole, and, except as disclosed in or contemplated by the Prospectus, there has been no dividend or distribution of any kind declared, paid or made by the Company on any class of its capital stock.

(xxi) The Company is subject to the reporting requirements of either Section 13 or Section 15(d) of the Exchange Act and files reports with the Commission on the Electronic Data Gathering, Analysis, and Retrieval (EDGAR) system.

(xxii) The Company is not an “investment company” as defined in the Investment Company Act of 1940.

(xxiii) The Company has not taken, directly or indirectly, any action designed to or that would constitute or that might reasonably be expected to cause or result in, under the Exchange Act or otherwise, stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of the Securities.

(xxiv) The minimum funding standard under Section 302 of the Employee Retirement Income Security Act of 1974, as amended, and the regulations and published interpretations thereunder (“ERISA”), has been satisfied by each “pension plan” (as defined in Section 3(2) of ERISA) which has been established or maintained by the Company and/or one or more of its subsidiaries, and the trust forming part of each such plan which is intended to be qualified under

Section 401 of the Internal Revenue Code of 1986, as amended, is so qualified; each of the Company and its subsidiaries has fulfilled its obligations, if any, under Section 515 of ERISA; each welfare plan established or maintained by the Company and/or one or more of its subsidiaries is in compliance in all material respects with the currently applicable provisions of ERISA; and neither the Company nor any of its subsidiaries has incurred or could reasonably be expected to incur any withdrawal liability under Section 4201 of ERISA, any liability under Section 4062, 4063, or 4064 of ERISA, or any other liability under Title IV of ERISA.

(xxv) There is and has been no failure which is continuing on the part of the Company and any of the Company’s directors or officers, in their capacities as such, to comply with the provisions of the Sarbanes-Oxley Act of 2002 and the rules and regulations promulgated in connection therewith (the “Sarbanes-Oxley Act”).

(xxvi) Neither the Company nor any of its subsidiaries nor, to the knowledge of the Company, any director, officer, agent, employee or affiliate of the Company or any of its subsidiaries is aware of or has taken any action, directly or indirectly, that would result in a violation by such persons of the Foreign Corrupt Practices Act of 1977, as amended, and the rules and regulations thereunder (the “FCPA”), including, without limitation, making use of the mails or any means or instrumentality of interstate commerce corruptly in furtherance of an offer, payment, promise to pay or authorization of the payment of any money, or other property, gift, promise to give, or authorization of the giving of anything of value to any “foreign official” (as such term is defined in the FCPA) or any foreign political party or official thereof or any candidate for foreign political office, in contravention of the FCPA and the Company, its subsidiaries and, to the knowledge of the Company, its affiliates have conducted their businesses in compliance with the FCPA and have instituted and maintain policies and procedures designed to ensure, and which are reasonably expected to continue to ensure, continued compliance therewith.

(xxvii) The operations of the Company and its subsidiaries are and have been conducted at all times in compliance with applicable financial recordkeeping and reporting requirements of the Currency and Foreign Transactions Reporting Act of 1970, as amended, the money laundering statutes of all jurisdictions, the rules and regulations thereunder and any related or similar rules, regulations or guidelines, issued, administered or enforced by any governmental agency (collectively, the “Money Laundering Laws”) and no action, suit or proceeding by or before any court or governmental agency, authority or body or any arbitrator involving the Company or any of its subsidiaries with respect to the Money Laundering Laws is pending or, to the best knowledge of the Company, threatened.

(xxviii) Neither the Company nor any of its subsidiaries nor, to the knowledge of the Company, any director, officer, agent, employee or affiliate of the Company or any of its subsidiaries is currently subject to any U.S. sanctions administered by the Office of Foreign Assets Control of the U.S. Treasury Department (“OFAC”).

(b) Each Selling Stockholder severally, and not jointly, represents and warrants to, and agrees with, the several Underwriters that:

(i) Such Selling Stockholder (A) has, and on each Closing Date hereinafter mentioned will have, valid title to the Offered Securities to be delivered by such Selling Stockholder on such Closing Date free and clear of all security interests, claims, liens, equities or other encumbrances, provided, however, that each of Stanfield Arbitrage CDO, Ltd., Stanfield CLO, Ltd. and Stanfield/RMF Transatlantic CDO, Ltd. may have pledges with respect to the Firm Securities they are selling to each of their respective trustees pursuant to indentures in effect on the date hereof so long as such pledges cease to be in effect with respect to such Firm Securities prior to

the First Closing Date (as defined below); (B), if such Selling Stockholder is not a natural person, has on the date hereof all necessary corporate or partnership, as the case may be, power and authority to enter into this Agreement and will have on each Closing Date all necessary corporate or partnership, as the case may be, power and authority to sell, assign, transfer and deliver the Offered Securities to be delivered by such Selling Stockholder on each Closing Date hereunder; and (C) upon payment for the Offered Securities to be sold by such Selling Stockholder pursuant to this Agreement, delivery of such Offered Securities, as directed by the Representatives, to Cede & Co. (“Cede”) or such other nominee as may be designated by the Depository Trust Company (“DTC”), registration of such Offered Securities in the name of Cede or such other nominee and the crediting of such Offered Securities on the books of DTC to securities accounts of the Underwriters (assuming that neither DTC nor any such Underwriter has notice of any adverse claim (within the meaning of Section 8-105 of the New York Uniform Commercial Code (the “UCC”)) to such Offered Securities), (1) DTC shall be a “protected purchaser” of such Offered Securities within the meaning of Section 8-303 of the UCC, (2) under Section 8-501 of the UCC, the Underwriters will acquire a valid security entitlement in respect of such Offered Securities and (3) no action based on any “adverse claim”, within the meaning of Section 8-102 of the UCC, to such Offered Securities may be asserted against the Underwriters with respect to such security entitlement; for purposes of this representation, such Selling Stockholder may assume that when such payment, delivery and crediting occur, (x) such Offered Securities will have been registered in the name of Cede or another nominee designated by DTC, in each case on the Company’s share registry in accordance with its certificate of incorporation, by-laws and applicable law, (y) DTC will be registered as a “clearing corporation” within the meaning of Section 8-102 of the UCC and (z) appropriate entries to the accounts of the several Underwriters on the records of DTC will have been made pursuant to the UCC.

(ii) Such Selling Stockholder has not taken, directly or indirectly, any action designed to or that would constitute or that might reasonably be expected to cause or result in, under the Exchange Act or otherwise, stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of the Securities.

(iii) No consent, approval, authorization or order of, or filing with, any governmental agency or body or any court is required to be obtained or made by such Selling Stockholder for the consummation of the transactions contemplated by this Agreement in connection with the sale of the Offered Securities being sold by such Selling Stockholder, except such as have been obtained and made under the Act and such as may be required pursuant to Sections 13 and 16 of the Exchange Act or under state securities laws.

(iv) This Agreement has been duly authorized, executed and delivered by or on behalf of such Selling Stockholder.

(v) Assuming the accuracy of the representations of the other parties hereto and the performance by those parties of their agreements herein, the execution, delivery and performance of this Agreement, and the consummation of the transactions herein contemplated, will not result in a breach or violation of any of the terms and provisions of, or constitute a default under, (1) any statute, rule, regulation or order of any governmental agency or body or any court, domestic or foreign, that has jurisdiction over such Selling Stockholder or any of its properties, (2) any agreement or instrument to which such Selling Stockholder is a party or by which such Selling Stockholder is bound or to which any of the properties of such Selling Stockholder is subject or (3) the organizational documents of such Selling Stockholder, except, with respect to clause (1) and (2), where such breach, violation or default would not, individually or in the aggregate, materially adversely affect such Selling Stockholder’s ability to fulfill its obligations under, and consummate the transactions contemplated by, this Agreement.

(vi) If the Effective Time of the Initial Registration Statement is prior to the execution and delivery of this Agreement: (A) on the Effective Date of the Initial Registration Statement, the Initial Registration Statement did not include any untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary to make the statements therein not misleading, (B) on the Effective Date of the Additional Registration Statement (if any), each Registration Statement did not include, or will not include, any untrue statement of a material fact and did not omit, or will not omit, to state any material fact required to be stated therein or necessary to make the statements therein not misleading, and (C) on the date of this Agreement, neither the Initial Registration Statement nor, if the Effective Time of the Additional Registration Statement is prior to the execution and delivery of this Agreement, the Additional Registration Statement includes, and at the time of filing of the Prospectus pursuant to Rule 424(b) or (if no such filing is required) at the Effective Date of the Additional Registration Statement in which the Prospectus is included, none of the Registration Statements or the Prospectus will include, any untrue statement of a material fact, and none of such documents omits, or will omit, to state any material fact required to be stated therein or necessary to make the statements therein (in the case of the Prospectus, in the light of the circumstances under which they were made) not misleading. If the Effective Time of the Initial Registration Statement is subsequent to the execution and delivery of this Agreement: on the Effective Date of the Initial Registration Statement, neither the Initial Registration Statement nor the Prospectus will include any untrue statement of a material fact or will omit to state any material fact required to be stated therein or necessary to make the statements therein (in the case of the Prospectus, in the light of the circumstances under which they were made) not misleading. This paragraph applies only to the extent that any statements in or omissions from a Registration Statement or the Prospectus are made in reliance upon and in conformity with written information furnished to the Company by such Selling Stockholder specifically for use therein, it being understood and agreed that the only such information furnished by any Selling Stockholder (the “Selling Stockholder Information”) consists of the name of such Selling Stockholder, the number of Offered Securities to be offered by such Selling Stockholder and the address and other information with respect to such Selling Stockholder (excluding any percentages) which appear in the table (and the corresponding footnotes thereto) under the caption “Principal and Selling Stockholders” in the Prospectus.

(vii) Except as disclosed in the Prospectus, there are no contracts, agreements or understandings between such Selling Stockholder and any person that would give rise to a valid claim against such Selling Stockholder or any Underwriter for a brokerage commission, finder’s fee or other like payment in connection with the sale of the Offered Securities by any Selling Stockholder.

(c) The Selling Stockholders other than Blum Strategic Partners, L.P., Blum Strategic Partners II, L.P. and Blum Strategic Partners GmbH & Co. KG (collectively, the “Blum Selling Stockholders”) (such Selling Stockholders being referred to collectively herein as the “Custodial Selling Stockholders”) have entered into the Custody Agreement (the “Custody Agreement”) with the Custodian (as defined below) relating to the deposit of the Offered Securities to be sold by the Custodial Selling Stockholders with the Custodian. Each Custodial Selling Stockholder severally, and not jointly, represents and warrants to, and agrees with, the several Underwriters that:

(i) Such Custodial Selling Stockholder has, and on each applicable Closing Date will have, full legal right, power and authority, and all authorization and approval required by law, to enter into the Custody Agreement and the Power of Attorney (the “Power of Attorney”) appointing Ray Wirta and Kenneth J. Kay as such Custodial Selling Stockholder’s attorneys-in-fact to the extent set forth therein and relating to the transactions contemplated hereby; and to sell, assign, transfer and deliver the Offered Securities to be sold by such Custodial Selling Stockholder in the manner provided herein and therein.

(ii) No consent, approval, authorization or order of, or filing with, any governmental agency or body or any court is required to be obtained or made by such Custodial Selling Stockholder for the consummation of the transactions contemplated by the Custody Agreement in connection with the sale of the Offered Securities being sold by such Custodial Selling Stockholder, except such as have been obtained and made under the Act and such as may be required pursuant to Sections 13 and 16 of the Exchange Act or under state securities laws.

(iii) The Power of Attorney and related Custody Agreement with respect to such Custodial Selling Stockholder have been duly authorized, executed and delivered by such Custodial Selling Stockholder and constitute valid and legally binding obligations of such Custodial Selling Stockholder enforceable in accordance with their terms, subject to bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium and similar laws of general applicability relating to or affecting creditors’ rights and to general equity principles.

(iv) Assuming the accuracy of the representations of the other parties thereto and the performance by those parties of their agreements therein, the execution, delivery and performance of the Custody Agreement, and the consummation of the transactions therein contemplated, will not result in a breach or violation of any of the terms and provisions of, or constitute a default under, (1) any statute, rule, regulation or order of any governmental agency or body or any court, domestic or foreign, that has jurisdiction over such Custodial Selling Stockholder or any of its properties, (2) any agreement or instrument to which such Custodial Selling Stockholder is a party or by which such Custodial Selling Stockholder is bound or to which any of the properties of such Custodial Selling Stockholder is subject or (3) the organizational documents of such Custodial Selling Stockholder, except, with respect to clause (1) and (2), where such breach, violation or default would not, individually or in the aggregate, materially adversely affect such Custodial Selling Stockholder’s ability to fulfill its obligations under, and consummate the transactions contemplated by, the Custody Agreement and this Agreement.

(d) Each Underwriter severally, and not jointly, represents and warrants to, and agrees with, the Company and the Selling Stockholders that:

(i) Such Underwriter has not offered, sold or delivered, and will not offer, sell or deliver, any of the Offered Securities, directly or indirectly, or distribute the Prospectus or any other offering material relating to the Offered Securities, in or from any jurisdiction except under circumstances that will result in compliance with the applicable laws and regulations thereof and that will not impose any obligations on the Company except as set forth in this Agreement.

(ii) Such Underwriter has not offered or sold, and, prior to the expiration of the period of six months from a Closing Date, will not offer or sell any Offered Securities to persons in the United Kingdom, except to those persons whose ordinary activities involve them in acquiring, holding, managing or disposing of investments (as principal or agent) for the purpose of their businesses or otherwise in circumstances which have not resulted and will not result in an offer to the public in the United Kingdom within the meaning of the Public Offers of Securities Regulations 1995.

(iii) Such Underwriter has complied, and will comply, with all applicable provisions of the Financial Services Act 1986 and all applicable provisions of the Financial Services and Markets Act 2000 (the “FSMA”) with respect to anything done by it in relation to the Offered Securities in, from or otherwise involving the United Kingdom.

(iv) Such Underwriter has only communicated or caused to be communicated, and will only communicate or cause to be communicated, any invitation or inducement to engage in investment activity (within the meaning of the FSMA) received by it in connection with the issue or sale of the Offered Securities in circumstances in which Section 21(1) of the FSMA does not apply to the Company.

(v) Such Underwriter acknowledges and agrees that (A) the Offered Securities will not be offered, sold, transferred or delivered in or from the Netherlands as part of its initial distribution, or at any time thereafter, directly or indirectly, other than to banks, pension funds, insurance companies, securities firms, investment institutions, central governments, large international and supranational institutions and other comparable entities, including, among others, treasuries and finance companies of large enterprises, which trade or invest in securities in the course of a profession or trade; and (B) individuals or legal entities who or which do not trade or invest in securities in the course of their profession or trade will not participate in the offering contemplated by this Agreement, and the Prospectus or any other offering material relating to the Offered Securities will not be considered an offer or the prospect of an offer to sell or exchange the Offered Securities.

3. Purchase, Sale and Delivery of Offered Securities. On the basis of the representations, warranties and agreements herein contained, but subject to the terms and conditions herein set forth, each Selling Stockholder agrees, severally and not jointly, to sell to each Underwriter, and each Underwriter agrees, severally and not jointly, to purchase from each Selling Stockholder, at a purchase price of $ per share, that number of Firm Securities (rounded up or down, as determined by Credit Suisse First Boston LLC (“CSFB”) in its discretion, in order to avoid fractions) obtained by multiplying the number of Firm Securities set forth opposite the name of such Selling Stockholder in Schedule A hereto by a fraction the numerator of which is the number of Firm Securities set forth opposite the name of such Underwriter in Schedule B hereto and the denominator of which is the total number of Firm Securities.

Certificates in negotiable form for the Offered Securities to be sold by the Custodial Selling Stockholders hereunder have been placed in custody, for delivery under this Agreement, under the Custody Agreement made with U.S. Bank National Association, as custodian (“Custodian”). Each Custodial Selling Stockholder agrees that the shares represented by the certificates held in custody for the Custodial Selling Stockholders under such Custody Agreement are subject to the interests of the Underwriters hereunder, that the arrangements made by the Custodial Selling Stockholders for such custody are to that extent irrevocable, and that the obligations of the Custodial Selling Stockholders hereunder shall not be terminated by operation of law, whether by the death of any individual Custodial Selling Stockholder or the occurrence of any other event, or in the case of a trust, by the death of any trustee or trustees or the termination of such trust. If any individual Custodial Selling Stockholder or any such trustee or trustees should die, or if any other such event should occur, or if any of such trusts should terminate, before the delivery of the Offered Securities hereunder, certificates for such Offered Securities shall be delivered by the Custodian in accordance with the terms and conditions of this Agreement as if

such death or other event or termination had not occurred, regardless of whether or not the Custodian shall have received notice of such death or other event or termination.

The Blum Selling Stockholders and the Custodian will deliver the Firm Securities to the Representatives for the accounts of the Underwriters, against payment of the purchase price in Federal (same day) funds by wire transfer to an account at a bank reasonably acceptable to CSFB drawn to the order of Blum Strategic Partners, L.P. in the case of 4,575,481 shares of Firm Securities being sold by Blum Strategic Partners, L.P., Blum Strategic Partners II, L.P. in the case of 5,314,933 shares of Firm Securities being sold by Blum Strategic Partners II, L.P., Blum Strategic Partners II GmbH & Co. KG in the case of 109,586 shares of Firm Securities being sold by Blum Strategic Partners II GmbH & Co. KG and the Custodian, for the accounts of the Custodial Selling Stockholders, in the case of 5,000,000 shares of Firm Securities being sold by the Custodial Selling Stockholders, at the office of Cravath, Swaine & Moore LLP, at 10:00 A.M., New York time, on , 2004, or at such other time not later than seven full business days thereafter as the Representatives and the Company determine, such time being herein referred to as the “First Closing Date”. For purposes of Rule 15c6-1 under the Securities Exchange Act of 1934, the First Closing Date (if later than the otherwise applicable settlement date) shall be the settlement date for payment of funds and delivery of securities for all the Offered Securities sold pursuant to the offering contemplated by this Agreement. The certificates for the Firm Securities so to be delivered will be in definitive form, in such denominations and registered in such names as CSFB requests and will be made available for checking and packaging a reasonable time in advance of the First Closing Date.

In addition, upon written notice from CSFB given to the Company and the Selling Stockholders from time to time not more than 30 days subsequent to the date of the Prospectus, the Underwriters may purchase, in the aggregate, all or less than all of the Optional Securities at the purchase price per Security to be paid for the Firm Securities. The Selling Stockholders listed in Schedule C hereto (the “Option Selling Stockholders”) agree, severally and not jointly, to sell to the Underwriters up to the respective number of Optional Securities (subject to adjustment by CSFB to eliminate fractions) set forth opposite the names of such Option Selling Stockholders in Schedule C hereto. Such Optional Securities shall be purchased from each Option Selling Stockholder for the account of each Underwriter in the same proportion as the number of Firm Securities set forth opposite such Underwriter’s name bears to the total number of Firm Securities (subject to adjustment by CSFB to eliminate fractions) and may be purchased by the Underwriters only for the purpose of covering over-allotments made in connection with the sale of the Firm Securities. No Optional Securities shall be sold or delivered unless the Firm Securities previously have been, or simultaneously are, sold and delivered. The right to purchase the Optional Securities or any portion thereof may be exercised from time to time and to the extent not previously exercised may be surrendered and terminated at any time upon notice by CSFB to the Company and the Option Selling Stockholders.

Each time for the delivery of and payment for the Optional Securities, being herein referred to as an “Optional Closing Date”, which may be the First Closing Date (the First Closing Date and each Optional Closing Date, if any, being sometimes referred to as a “Closing Date”), shall be determined by CSFB but shall be not later than five full business days after written notice of election to purchase Optional Securities is given. The Custodian will deliver the Optional Securities held for the applicable Custodial Selling Stockholders being purchased on each Optional Closing Date to the Representatives for the accounts of the several Underwriters, against payment of the purchase price therefor in Federal (same day) funds by wire transfer to an account at a bank reasonably acceptable to CSFB drawn to the order of the Custodian, for the accounts of such Custodial Selling Stockholders with respect to the Optional Securities being so purchased on such Optional Closing Date, at the above office of Cravath, Swaine & Moore LLP. If the Blum Selling Stockholders are Option Selling Stockholders on an Optional Closing Date, the Blum Selling Stockholders will deliver or shall cause to be delivered a security entitlement with respect to the Optional Securities being purchased from them on each such Optional Closing Date to the Representatives for the accounts of the several Underwriters, against payment of the purchase price therefor in Federal (same day) funds by wire transfer to an account at a bank reasonably acceptable to

CSFB drawn to the order of the Blum Selling Stockholders with respect to the Optional Securities being so purchased on such Optional Closing Date, at the above office of Cravath, Swaine & Moore LLP. The certificates for the Optional Securities being purchased on each Optional Closing Date will be in definitive form, in such denominations and registered in such names as CSFB requests upon reasonable notice prior to such Optional Closing Date and will be made available for checking and packaging at the above office of Cravath, Swaine & Moore LLP at a reasonable time in advance of such Optional Closing Date.

4. Offering by Underwriters. It is understood that the several Underwriters propose to offer the Offered Securities for sale to the public as set forth in the Prospectus.

5. Certain Agreements of the Company and the Selling Stockholders. In the case of paragraphs (a) through (g), (h) (to the extent applicable to the Company) and (i) below, the Company agrees with the several Underwriters, and in the case of paragraphs (h) (to the extent applicable to the Selling Stockholders) and (i) below, the Selling Stockholders severally and not jointly agree with the several Underwriters, that:

(a) If the Effective Time of the Initial Registration Statement is prior to the execution and delivery of this Agreement, the Company will file the Prospectus with the Commission pursuant to and in accordance with subparagraph (1) (or, if applicable and if consented to by CSFB, subparagraph (4)) of Rule 424(b) not later than the earlier of (i) the second business day following the execution and delivery of this Agreement and (ii) the fifteenth business day after the Effective Date of the Initial Registration Statement.

The Company will advise the Representatives promptly of any such filing pursuant to Rule 424(b). If the Effective Time of the Initial Registration Statement is prior to the execution and delivery of this Agreement and an additional registration statement is necessary to register a portion of the Offered Securities under the Act but the Effective Time thereof has not occurred as of such execution and delivery, the Company will file the additional registration statement or, if filed, will file a post-effective amendment thereto with the Commission pursuant to and in accordance with Rule 462(b) on or prior to 10:00 P.M., New York time, on the date of this Agreement or, if earlier, on or prior to the time the Prospectus is printed and distributed to any Underwriter, or will make such filing at such later date as shall have been consented to by CSFB.

(b) The Company will advise the Representatives promptly of any proposal to amend or supplement the initial or any additional registration statement as filed or the related prospectus or the Initial Registration Statement, the Additional Registration Statement (if any) or the Prospectus and will not effect such amendment or supplementation without CSFB’s consent; and the Company will also advise the Representatives promptly of the effectiveness of each Registration Statement (if its Effective Time is subsequent to the execution and delivery of this Agreement) and of any amendment or supplementation of a Registration Statement or the Prospectus and of the institution by the Commission of any stop order proceedings in respect of a Registration Statement and will use its reasonable best efforts to prevent the issuance of any such stop order and to obtain as soon as possible its lifting, if issued.

(c) If, at any time when a prospectus relating to the Offered Securities is required to be delivered under the Act in connection with sales by any Underwriter or dealer, any event occurs as a result of which the Prospectus as then amended or supplemented would include an untrue statement of a material fact or omit to state any material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading, or if it is necessary at any time to amend the Prospectus to comply with the Act, the Company will promptly notify the Representatives of such event and will promptly prepare and file with the Commission, at its own expense, an amendment or supplement which will correct such statement or omission or an amendment which will effect such compliance. Neither CSFB’s consent to, nor the Underwriters’ delivery of, any such amendment or supplement shall constitute a waiver of any of the conditions set forth in Section 6.

(d) As soon as practicable, but not later than the Availability Date (as defined below), the Company will make generally available to its securityholders an earnings statement covering a period of at least 12 months beginning after the Effective Date of the Initial Registration Statement (or, if later, the Effective Date of the Additional Registration Statement) which will satisfy the provisions of Section 11(a) of the Act. For the purpose of the preceding sentence, “Availability Date” means the 90th day after the end of the Company’s fourth fiscal quarter of the year after the year during which such Effective Date occurs.

(e) The Company will furnish to the Representatives copies of each Registration Statement (one of which will be signed and, along with four other copies, will include all exhibits), each related preliminary prospectus, and, so long as a prospectus relating to the Offered Securities is required to be delivered under the Act in connection with sales by any Underwriter or dealer, the Prospectus and all amendments and supplements to such documents, in each case in such quantities as the Representatives shall reasonably request. The Prospectus shall be so furnished on or prior to 11:00 A.M., New York time, on the second business day following the later of the execution and delivery of this Agreement or the Effective Time of the Initial Registration Statement. All other such documents shall be so furnished as soon as available. The Company will pay the expenses of printing and distributing to the Underwriters all such documents.

(f) The Company will arrange for the qualification of the Offered Securities for sale under the laws of such U.S. and Canadian jurisdictions as CSFB shall designate and will continue such qualifications in effect so long as required for the distribution; provided, however, that in connection therewith the Company shall not be required to qualify as a foreign corporation or to file a general consent to service of process in any jurisdiction or to subject itself to taxation in respect of doing business in any jurisdiction in which it is not otherwise so subject.

(g) For a period of 90 days after the date of the public offering of the Offered Securities (the “Lock-up Period”), the Company will not offer, sell, contract to sell, pledge or otherwise dispose of, directly or indirectly, or file with the Commission a registration statement under the Act relating to, any additional shares of its Securities or securities convertible into or exchangeable or exercisable for any shares of its Securities, or publicly disclose the intention to make any such offer, sale, pledge, disposition or filing, without the prior written consent of CSFB, except (i) registration statements on Form S-8, (ii) issuances of Securities pursuant to the conversion or exchange of convertible or exchangeable securities or the exercise of warrants or options, in each case outstanding on the date hereof, (iii) grants of employee stock options, shares of restricted stock and any other awards pursuant to the terms of a plan in effect on the First Closing Date and described in the Prospectus and (iv) issuances of Securities pursuant to an employee benefit plan in effect on the First Closing Date or as amended subsequent to the First Closing Date and, in each case, described in the Prospectus.

(h) The Company agrees with the several Underwriters that the Company will pay (A) the expenses incident to the performance of the obligations of the Company and each Selling Stockholder under this Agreement to the extent provided in Section 3(e) of the Second Amendment and Waiver to the Securityholders’ Agreement (the “Second Amendment and Waiver”), dated as of November 24, 2004, by and among the Company, the Selling Stockholders and the other parties hereto, (B) for any filing fees and other expenses (including reasonable fees and disbursements of counsel) in connection with qualification of the Offered Securities for sale under the laws of such jurisdictions as CSFB designates and the printing of memoranda relating thereto, (C) for the filing fee incident to the review by the National Association of Securities Dealers, Inc. of the Offered Securities, and (D) for expenses incurred in distributing preliminary prospectuses and the Prospectus (including any amendments and supplements thereto) to the Underwriters. Each of the Company (on behalf of itself and the Selling Stockholders), on the one hand, and the Underwriters, on the other hand, will pay its own expenses in connection with attending or hosting meetings with prospective purchasers of the Offered Securities, including the costs attributable to the use of a private airplane to attend such meetings to the extent one is so used.

(i) The Company and each Selling Stockholder agree with the several Underwriters that they will not take, directly or indirectly, any action designed to or that would constitute or that might reasonably be expected to cause or result in, under the Exchange Act or otherwise, stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of the Securities.

The Company and each of the Selling Stockholders agree that, notwithstanding anything in this Section 5 to the contrary, this Agreement shall not in any way supersede any of the rights or obligations of the Company, CB Richard Ellis Services, or any of the Selling Stockholders under the Securityholders’ Agreement dated as of July 20, 2001 (the “Securityholders’ Agreement”), by and among the Company, CB Richard Ellis Services, Inc., the Selling Stockholders and the other parties thereto, as amended on April 14, 2004 and November 24, 2004 and as further amended from time to time. As between the Company and any of the Selling Stockholders, in the event of any conflict between this Agreement and the Securityholders’ Agreement, as amended from time to time, the Securityholders’ Agreement shall control.

6. Conditions of the Obligations of the Underwriters. The obligations of the several Underwriters to purchase and pay for the Firm Securities on the First Closing Date and the Optional Securities to be purchased on each Optional Closing Date will be subject to the accuracy of the representations and warranties on the part of the Company and the applicable Selling Stockholders herein, to the accuracy of the statements of Company officers made pursuant to the provisions hereof, to the performance by the Company and the applicable Selling Stockholders of their obligations hereunder and to the following additional conditions precedent:

(a) The Representatives shall have received a letter, dated the date of delivery thereof (which, if the Effective Time of the Initial Registration Statement is prior to the execution and delivery of this Agreement, shall be on or prior to the date of this Agreement or, if the Effective Time of the Initial Registration Statement is subsequent to the execution and delivery of this Agreement, shall be prior to the filing of the amendment or post-effective amendment to the registration statement to be filed shortly prior to such Effective Time), of KPMG LLP with respect to the financial statements and schedules of Insignia Financial Group, Inc. contained in the Registration Statement and Deloitte & Touche LLP with respect to the financial statements and schedules of the Company contained in the Registration Statement, in each case in form and substance satisfactory to the Representatives in all respects.

(b) If the Effective Time of the Initial Registration Statement is not prior to the execution and delivery of this Agreement, such Effective Time shall have occurred not later than 10:00 P.M., New York time, on the date of this Agreement or such later date as shall have been consented to by CSFB. If the Effective Time of the Additional Registration Statement (if any) is not prior to the execution and delivery of this Agreement, such Effective Time shall have occurred not later than 10:00 P.M., New York time, on the date of this Agreement or, if earlier, the time the Prospectus is printed and distributed to any Underwriter, or shall have occurred at such later date as shall have been consented to by CSFB. If the Effective Time of the Initial Registration Statement is prior to the execution and delivery of this Agreement, the Prospectus shall have been filed with the Commission in accordance with the Rules and Regulations and Section 5(a) of this Agreement. Prior to such Closing Date, no stop order suspending the effectiveness of a Registration Statement shall have been issued that has not been lifted and no proceedings for that purpose shall have been instituted that have not been terminated or, to the knowledge of any Selling Stockholder, the Company or CSFB, shall be contemplated by the Commission.

(c) Subsequent to the execution and delivery of this Agreement, there shall not have occurred (i) any change, or any development or event involving a prospective change, in the financial condition, business, properties or results of operations of the Company and its subsidiaries taken as one enterprise which, in the judgment of a majority in interest of the Underwriters including the Representatives, is material and adverse and makes it impractical or inadvisable to proceed with completion of the public offering or the sale of and payment for the Offered Securities; (ii) any downgrading in the rating of any

debt securities of the Company by any “nationally recognized statistical rating organization” (as defined for purposes of Rule 436(g) under the Act), or any public announcement that any such organization has under surveillance or review its rating of any debt securities of the Company (other than an announcement with positive implications of a possible upgrading, and no implication of a possible downgrading, of such rating) or any announcement that the Company has been placed on negative outlook; (iii) any change in U.S. or international financial, political or economic conditions or currency exchange rates or exchange controls as would, in the judgment of a majority in interest of the Underwriters including the Representatives, be likely to prejudice materially the success of the proposed issue, sale or distribution of the Offered Securities, whether in the primary market or in respect of dealings in the secondary market; (iv) any material suspension or material limitation of trading in securities generally on the New York Stock Exchange, or any setting of minimum prices for trading on such exchange; (v) or any suspension of trading of any securities of the Company on any exchange or in the over-the-counter market; (vi) any banking moratorium declared by U.S. Federal or New York authorities; (vii) any major disruption of settlements of securities or clearance services in the United States; or (viii) any attack on, outbreak or escalation of hostilities or act of terrorism involving the United States, any declaration of war by Congress or any other national or international calamity or emergency if, in the judgment of a majority in interest of the Underwriters including the Representatives, the effect of any such attack, outbreak, escalation, act, declaration, calamity or emergency makes it impractical or inadvisable to proceed with completion of the public offering or the sale of and payment for the Offered Securities.

(d) The Representatives shall have received an opinion, dated such Closing Date, of Simpson Thacher & Bartlett LLP, counsel for the Company, substantially in the form of Exhibit A-1 hereto and a letter, dated such Closing Date, substantially in the form of Exhibit A-2 hereto.

(e) The Representatives shall have received an opinion, dated such Closing Date, of Laurence Midler, Esq., General Counsel of the Company, substantially in the form of Exhibit B hereto.

(f) The Representatives shall have received an opinion, dated such Closing Date (or, in the case of Stanfield Arbitrage CDO, Ltd., Stanfield CLO, Ltd., Stanfield/RMF Transatlantic CDO, Ltd. and National City Corporation, dated the First Closing Date), of counsel for each of the Selling Stockholders, substantially in the forms of Exhibits C-1 through C-12 hereto.

(g) The Representatives shall have received from Cravath, Swaine & Moore LLP, counsel for the Underwriters, such opinion or opinions, dated such Closing Date, with respect to the incorporation of the Company, the validity of the Offered Securities delivered on such Closing Date, the Registration Statements, the Prospectus and other related matters as the Representatives may require, and the Selling Stockholders and the Company shall have furnished to such counsel such documents as they request for the purpose of enabling them to pass upon such matters.

(h) The Representatives shall have received a certificate, dated such Closing Date, of the Chief Executive Officer or the President or any Vice President and a principal financial or accounting officer of the Company in which such officers, to the best of their knowledge after reasonable investigation, shall state that: the representations and warranties of the Company in this Agreement are true and correct; the Company has complied with all agreements and satisfied all conditions on its part to be performed or satisfied hereunder at or prior to such Closing Date; no stop order suspending the effectiveness of any Registration Statement has been issued that has not been lifted and no proceedings for that purpose have been instituted (that have not been terminated) or are contemplated by the Commission; the Additional Registration Statement (if necessary hereunder) satisfying the requirements of subparagraphs (1) and (3) of Rule 462(b) was filed pursuant to Rule 462(b), including payment of the applicable filing fee in accordance with Rule 111(a) or (b) under the Act, prior to the time the Prospectus was printed and distributed to any Underwriter; and, subsequent to the date of the most recent financial statements in the Prospectus, there has been no material adverse change, nor any development or event involving a prospective material adverse change, in the financial condition, business, properties or results of

operations of the Company and its subsidiaries taken as a whole except as set forth in the Prospectus or as described in such certificate.

(i) The Representatives shall have received a letter, dated the Closing Date, of Deloitte & Touche LLP which meets the requirements of subsection (a) of this Section, except that the specified date referred to in such subsection will be a date not more than three days prior to the Closing Date for the purposes of this subsection.

(j) The Representatives shall have received certificates, each dated the date hereof, from Kenneth J. Kay, Chief Financial Officer of the Company, substantially in the forms of Exhibit D and Exhibit E hereto.

(k) On or prior to the date of this Agreement, the Representatives shall have received lock-up letters from each of the equityholders of the Company listed in Schedule D hereto.

(l) The Custodian will deliver to CSFB a letter stating that they will deliver to each Custodial Selling Stockholder a United States Treasury Department Form 1099 (or other applicable form or statement specified by the United States Treasury Department regulations in lieu thereof) on or before January 31 of the year following the date of this Agreement.

(m) Each Blum Selling Stockholder agrees to deliver to CSFB prior to closing a properly completed and executed United States Treasury Department Form W-9 (or other applicable form or statement specified by Treasury Department regulations in lieu thereof).

The Selling Stockholders and the Company will furnish the Representatives with such conformed copies of such opinions, certificates, letters and documents as the Representatives reasonably request. CSFB may, in its sole discretion, waive on behalf of the Underwriters compliance with any conditions to the obligations of the Underwriters hereunder, whether in respect of a Closing Date or otherwise.

7. Indemnification and Contribution. (a) The Company will indemnify and hold harmless each Underwriter, its partners, members, directors and officers and each person, if any who controls such Underwriter within the meaning of Section 15 of the Act, against any losses, claims, damages or liabilities, joint or several, to which such Underwriter may become subject, under the Act or otherwise, insofar as such losses, claims, damages or liabilities (or actions in respect thereof) arise out of or are based upon any untrue statement or alleged untrue statement of any material fact contained in any Registration Statement, the Prospectus, or any amendment or supplement thereto, or any related preliminary prospectus, or arise out of or are based upon the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein (in the case of the Prospectus, in the light of the circumstances under which they were made) not misleading, and will reimburse each Underwriter for any legal or other expenses reasonably incurred by such Underwriter in connection with investigating or defending any such loss, claim, damage, liability or action as such expenses are incurred; provided, however, that the Company will not be liable in any such case to the extent that any such loss, claim, damage or liability arises out of or is based upon an untrue statement or alleged untrue statement in or omission or alleged omission from any of such documents in reliance upon and in conformity with written information furnished to the Company by any Underwriter through the Representatives specifically for use therein, it being understood and agreed that the only such information furnished by any Underwriter consists of the information described as such in subsection (c) below; and provided, further, that with respect to any untrue statement or alleged untrue statement in or omission or alleged omission from any preliminary prospectus, the indemnity agreement contained in this subsection (a) shall not inure to the benefit of any Underwriter from whom the person asserting any such losses, claims, damages or liabilities purchased the Offered Securities concerned, to the extent that a prospectus relating to such Offered Securities was required by law to be delivered by such Underwriter in connection with such purchase and any such loss, claim, damage or liability (or action in respect thereof) of such Underwriter results from the fact that there was not sent or given to such person, at or prior to the written

confirmation of the sale of such Offered Securities to such person, a copy of the Prospectus if the Company had previously furnished copies thereof to such Underwriter in accordance with this Agreement.

(b) Each Selling Stockholder, severally and not jointly, will indemnify and hold harmless each Underwriter, its partners, directors and officers and each person who controls such Underwriter within the meaning of Section 15 of the Act, against any losses, claims, damages or liabilities, joint or several, to which such Underwriter may become subject, under the Act or otherwise, insofar as such losses, claims, damages or liabilities (or actions in respect thereof) arise out of or are based upon any untrue statement or alleged untrue statement of any material fact contained in any Registration Statement, the Prospectus, or any amendment or supplement thereto, or any related preliminary prospectus, or arise out of or are based upon the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein (in the case of the Prospectus, in the light of the circumstances under which they were made) not misleading, and will reimburse each Underwriter for any legal or other expenses reasonably incurred by such Underwriter in connection with investigating or defending any such loss, claim, damage, liability or action as such expenses are incurred, in each case to the extent, but only to the extent, that such untrue statement or alleged untrue statement or omission or alleged omission was made in reliance upon and in conformity with the Selling Stockholder Information relating to such Selling Stockholder; and provided that with respect to any untrue statement or alleged untrue statement in or omission or alleged omission from any preliminary prospectus, the indemnity agreement contained in this subsection (b) shall not inure to the benefit of any Underwriter from whom the person asserting any such losses, claims, damages or liabilities purchased the Offered Securities concerned, to the extent that a prospectus relating to such Offered Securities was required by law to be delivered by such Underwriter in connection with such purchase and any such loss, claim, damage or liability (or action in respect thereof) of such Underwriter results from the fact that there was not sent or given to such person, at or prior to the written confirmation of the sale of such Offered Securities to such person, a copy of the Prospectus if the Company had previously furnished copies thereof to such Underwriter in accordance with this Agreement; and provided, further, that the liability under this subsection (b) of each Selling Stockholder shall be limited to an amount equal to the aggregate gross proceeds after underwriting commissions and discounts, but before expenses, to such Selling Stockholder from the sale of Offered Securities sold by such Selling Stockholder hereunder.

(c) Each Underwriter will severally and not jointly indemnify and hold harmless the Company, its directors and officers and each person, if any, who controls the Company within the meaning of Section 15 of the Act, and each Selling Stockholder, its partners, members, directors, officers, and each person, if any, who controls such Selling Stockholder within the meaning of Section 15 of the Act, against any losses, claims, damages or liabilities (or actions in respect thereof), joint or several, to which the Company or such Selling Stockholder may become subject, under the Act or otherwise, insofar as such losses, claims, damages or liabilities (or actions in respect thereof), joint or several, arise out of or are based upon any untrue statement or alleged untrue statement of any material fact contained in any Registration Statement, the Prospectus, or any amendment or supplement thereto, or any related preliminary prospectus, or arise out of or are based upon the omission or the alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, in each case to the extent, but only to the extent, that such untrue statement or alleged untrue statement or omission or alleged omission was made in reliance upon and in conformity with written information furnished to the Company by such Underwriter through the Representatives specifically for use therein, and will reimburse any legal or other expenses reasonably incurred by the Company and each Selling Stockholder in connection with investigating or defending any such loss, claim, damage, liability or action as such expenses are incurred, it being understood and agreed that the only such information furnished by any Underwriter consists of (i) the following information in the Prospectus, under the caption “Underwriting,” furnished on behalf of each Underwriter: (A) the concession and reallowance figures appearing in the fourth paragraph, (B) the fifteenth paragraph related to stabilizing transactions, over-allotment transactions, syndicate covering transactions and penalty bids and (C) the sixteenth paragraph related to prospectuses in electronic format; and (ii) the following information in the Prospectus, under the caption “Underwriting,” furnished on behalf of CSFB: the description of the number (but not the

percentage) of Securities beneficially owned by affiliates of CSFB and the percentage of the Company’s term loan facility beneficially owned by affiliates of CSFB.

(d) Promptly after receipt by an indemnified party under this Section of notice of the commencement of any action, such indemnified party will, if a claim in respect thereof is to be made against an indemnifying party under subsection (a), (b) or (c) above, notify the indemnifying party of the commencement thereof; but the failure to notify the indemnifying party shall not relieve it from any liability that it may have under subsection (a), (b) or (c) above except to the extent that it has been materially prejudiced (through the forfeiture of substantive rights or defenses) by such failure; and provided further that the failure to notify the indemnifying party shall not relieve it from any liability that it may have to an indemnified party otherwise than under subsection (a), (b) or (c) above. In case any such action is brought against any indemnified party and it notifies an indemnifying party of the commencement thereof, the indemnifying party will be entitled to participate therein and, to the extent that it may wish, jointly with any other indemnifying party similarly notified, to assume the defense thereof, with counsel reasonably satisfactory to such indemnified party (who shall not, except with the consent of the indemnified party, be counsel to the indemnifying party), and after notice from the indemnifying party to such indemnified party of its election so to assume the defense thereof, the indemnifying party will not be liable to such indemnified party under this Section for any legal or other expenses subsequently incurred by such indemnified party in connection with the defense thereof other than reasonable costs of investigation. No indemnifying party shall, without the prior written consent of the indemnified party, effect any settlement of any pending or threatened action in respect of which any indemnified party is or could have been a party and indemnity could have been sought hereunder by such indemnified party unless such (i) settlement includes an unconditional release of such indemnified party from all liability on any claims that are the subject matter of such action and (ii) does not include a statement as to, or an admission of, fault, culpability or a failure to act by or on behalf of an indemnified party. No indemnifying party shall be liable for any settlement of any proceeding without its prior written consent, which consent shall not be unreasonably withheld.

(e) If the indemnification provided for in this Section is unavailable or insufficient to hold harmless an indemnified party under subsection (a), (b) or (c) above, then each indemnifying party shall contribute to the amount paid or payable by such indemnified party as a result of the losses, claims, damages or liabilities referred to in subsection (a), (b) or (c) above (i) in such proportion as is appropriate to reflect the relative benefits received by the Company and the Selling Stockholders on the one hand and the Underwriters on the other from the offering of the Securities or (ii) if the allocation provided by clause (i) above is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause (i) above but also the relative fault of the Company and the Selling Stockholders on the one hand and the Underwriters on the other in connection with the statements or omissions which resulted in such losses, claims, damages or liabilities as well as any other relevant equitable considerations. The relative benefits received by the Company and the Selling Stockholders on the one hand and the Underwriters on the other shall be deemed to be in the same proportion as the total net proceeds from the offering (before deducting expenses) received by the Selling Stockholders bear to the total underwriting discounts and commissions received by the Underwriters. The relative fault shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by the Company, the Selling Stockholders or the Underwriters and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such untrue statement or omission. The amount paid by an indemnified party as a result of the losses, claims, damages or liabilities referred to in the first sentence of this subsection (e) shall be deemed to include any legal or other expenses reasonably incurred by such indemnified party in connection with investigating or defending any action or claim which is the subject of this subsection (e). Notwithstanding the provisions of this subsection (e), (i) no Underwriter shall be required to contribute any amount in excess of the amount by which the total price at which the Securities underwritten by it and distributed to the public were offered to the public exceeds the amount of any damages which such Underwriter has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission, and (ii) the liability under this

subsection of each Selling Stockholder shall be limited to an amount equal to the aggregate gross proceeds after underwriting commissions and discounts, but before expenses, to such Selling Stockholder from the sale of the Firm and Optional Securities (if any) sold by such Selling Stockholder hereunder, less any amounts for which such Selling Stockholder is liable under subsection (b) above. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The Underwriters’ obligations in this subsection (e) to contribute are several in proportion to their respective underwriting obligations and not joint. The Selling Stockholders’ obligations in this subsection (e) to contribute are several in proportion to their respective aggregate gross proceeds received after underwriting commissions and discounts, but before expenses, from the sale of the Firm and Optional Securities (if any) sold by the Selling Stockholders hereunder and not joint.

(f) The obligations of the Company and the Selling Stockholders under this Section shall be in addition to any liability which the Company and the Selling Stockholders may otherwise have and shall extend, upon the same terms and conditions, to each person, if any, who controls any Underwriter within the meaning of the Act; and the obligations of the Underwriters under this Section shall be in addition to any liability which the respective Underwriters may otherwise have and shall extend, upon the same terms and conditions, to each director of the Company, to each Selling Stockholder, to each officer of the Company who has signed a Registration Statement and to each person, if any, who controls the Company or any Selling Stockholder within the meaning of the Act.

8. Default of Underwriters. If any Underwriter or Underwriters default in their obligations to purchase Offered Securities hereunder on either the First Closing Date or any Optional Closing Date and the aggregate number of shares of Offered Securities that such defaulting Underwriter or Underwriters agreed but failed to purchase does not exceed 10% of the total number of shares of Offered Securities that the Underwriters are obligated to purchase on such Closing Date, the Representatives jointly may make arrangements satisfactory to the Selling Stockholders for the purchase of such Offered Securities by other persons, including any of the Underwriters, but if no such arrangements are made by such Closing Date, the non-defaulting Underwriters shall be obligated severally, in proportion to their respective commitments hereunder, to purchase the Offered Securities that such defaulting Underwriters agreed but failed to purchase on such Closing Date. If any Underwriter or Underwriters so default and the aggregate number of shares of Offered Securities with respect to which such default or defaults occur exceeds 10% of the total number of shares of Offered Securities that the Underwriters are obligated to purchase on such Closing Date and arrangements satisfactory to the Representatives and the Selling Stockholders for the purchase of such Offered Securities by other persons are not made within 36 hours after such default, this Agreement will terminate without liability on the part of any non-defaulting Underwriter, the Company or the Selling Stockholders, except as provided in Section 9 (provided that if such default occurs with respect to Optional Securities after the First Closing Date, this Agreement will not terminate as to the Firm Securities or any Optional Securities purchased prior to such termination). As used in this Agreement, the term “Underwriter” includes any person substituted for an Underwriter under this Section. Nothing herein will relieve a defaulting Underwriter from liability for its default.

9. Survival of Certain Representations and Obligations. The respective indemnities, agreements, representations, warranties and other statements of the several Selling Stockholders, of the Company or its officers and of the several Underwriters set forth in or made pursuant to this Agreement will remain in full force and effect, regardless of any investigation, or statement as to the results thereof, made by or on behalf of any Underwriter, any Selling Stockholder, the Company or any of their respective representatives, officers or directors, partners, members, or any controlling person, and will survive delivery of and payment for the Offered Securities. If this Agreement is terminated pursuant to Section 8 or if for any reason the purchase of the Offered Securities by the Underwriters is not consummated, the Company and the Selling Stockholders (as applicable) shall remain responsible for the expenses to be paid or reimbursed by them pursuant to Section 5 and the respective obligations of the Company, the Selling Stockholders, and the Underwriters pursuant to Section 7 shall remain in effect, and if any Offered Securities have been purchased hereunder the representations and warranties in Section 2 and all

obligations under Section 5 shall also remain in effect. If the purchase of the Offered Securities by the Underwriters is not consummated for any reason other than solely because of the termination of this Agreement pursuant to Section 8 or the occurrence of any event specified in clause (iii), (iv), (vi), (vii) or (viii) of Section 6(c), the Company will reimburse the Underwriters for all out-of-pocket expenses (including fees and disbursements of counsel) reasonably incurred by them in connection with the offering of the Offered Securities.

10. Notices. All communications hereunder will be in writing and, if sent to the Underwriters, will be mailed, delivered or faxed and confirmed to the Representatives, c/o Credit Suisse First Boston LLC, Eleven Madison Avenue, New York, N.Y. 10010-3629, Attention: Transactions Advisory Group (fax: 212-325-4296), or, if sent to the Company, will be mailed, delivered or faxed and confirmed to it at CB Richard Ellis Group, Inc., 865 South Figueroa Street, Suite 3400, Los Angeles, California 90017, Attention: Kenneth J. Kay, Chief Financial Officer (fax: 213-438-4820), or, if sent to the Selling Stockholders or any of them, will be mailed, delivered or faxed and confirmed to each of them at its respective address set forth on Schedule A hereto; provided, however, that any notice to an Underwriter pursuant to Section 7 will be mailed, delivered or faxed and confirmed to such Underwriter.

11. Successors. This Agreement will inure to the benefit of and be binding upon the parties hereto and their respective personal representatives and successors and the officers and directors and controlling persons referred to in Section 7, and no other person will have any right or obligation hereunder.

12. Representation. The Representatives will act for the several Underwriters in connection with the transactions contemplated by this Agreement, and any action under this Agreement taken by the Representatives jointly or by CSFB will be binding upon all the Underwriters. Ray Wirta and Kenneth J. Kay will act for the Custodial Selling Stockholders in connection with such transactions, and any action under or in respect of this Agreement taken by Ray Wirta and Kenneth J. Kay pursuant to, and in conformity with the applicable provisions of, the Power of Attorney will be binding upon all the Custodial Selling Stockholders.

13. Counterparts. This Agreement may be executed in any number of counterparts, each of which shall be deemed to be an original, but all such counterparts shall together constitute one and the same Agreement.

14. Applicable Law. This Agreement shall be governed by, and construed in accordance with, the laws of the State of New York.

The Company hereby submits to the non-exclusive jurisdiction of the Federal and state courts in the Borough of Manhattan in The City of New York in any suit or proceeding arising out of or relating to this Agreement or the transactions contemplated hereby.

If the foregoing is in accordance with the Representatives’ understanding of our agreement, kindly sign and return to the Company one of the counterparts hereof, whereupon it will become a binding agreement among the Selling Stockholders, the Company and the several Underwriters in accordance with its terms.


CB RICHARD ELLIS GROUP, INC.

	By
		Name:
		Title:

BLUM STRATEGIC PARTNERS, L.P.

By	Blum Strategic GP, L.L.C., its general partner

	By
		Name:
		Title:

BLUM STRATEGIC PARTNERS II, L.P.

By	Blum Strategic GP II, L.L.C., its general partner

	By
		Name:
		Title:

BLUM STRATEGIC PARTNERS II GMBH & CO. KG

By	Blum Strategic GP II, L.L.C., its managing partner

	By
		Name:
		Title:

FS EQUITY PARTNERS III, L.P.

By	FS Capital Partners, L.P., its general partner

	By	FS Holdings, Inc., its general partner

	By
		Name:
		Title:


FS EQUITY PARTNERS INTERNATIONAL, L.P.

By	FS&Co. International, L.P., its general partner

	By	FS International Holdings, Limited, its general partner

	By
		Name:
		Title:

DLJ INVESTMENT PARTNERS, L.P.

By	DLJ Investment Partners II, Inc., its managing general partner

	By
		Name:
		Title:

DLJ INVESTMENT PARTNERS II, L.P.

By	DLJ Investment Partners II, Inc., its managing general partner

	By
		Name:
		Title:

DLJIP II HOLDINGS, L.P.

By	DLJ Investment Partners II, Inc., its general partner

	By
		Name:
		Title:

NATIONAL CITY CORPORATION

By
	Name:
	Title:

STANFIELD ARBITRAGE CDO, LTD.

By	Stanfield Capital Partners LLC, as Collateral Manager

	By
		Name:
		Title:


STANFIELD/RMF TRANSATLANTIC CDO, LTD.

By	Stanfield Capital Partners LLC, as Collateral Manager

	By
		Name:
		Title:

CALIFORNIA PUBLIC EMPLOYEES’ RETIREMENT SYSTEM

By
	Name:
	Title:

FREDERIC V. MALEK


STANFIELD CLO, LTD.

By	Stanfield Capital Partners LLC, as Collateral Manager

	By
		Name:
		Title:


The foregoing Underwriting Agreement is hereby confirmed and accepted as of the date first above written.

	CREDIT SUISSE FIRST BOSTON LLC

	CITIGROUP GLOBAL MARKETS INC.

	Acting on behalf of themselves and as the Representatives of the several Underwriters.

CREDIT SUISSE FIRST BOSTON LLC

	By
		Name:
		Title:

CITIGROUP GLOBAL MARKETS INC.

	By
		Name:
		Title: