EXHIBIT 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the use in this Amendment No. 5 to the Registration Statement (No. 333-112867) of CB Richard Ellis Group, Inc. on Form S-1 of our report dated March 30, 2004 (June 7, 2004 as to the effects of the stock split and reverse stock split described in Note 23) (which report expresses an unqualified opinion and includes explanatory paragraphs referring to the adoption of statement of Financial Accounting Standards No. 142 effective January 1, 2002 and concerning the application of procedures relating to certain disclosures and revisions of financial statement amounts related to the 2001 financial statements that were audited by other auditors who have ceased operations and for which we have expressed no opinion or other form of assurance other than with respect to such disclosures and revisions), appearing in the Prospectus which is part of this Registration Statement,

We also consent to the reference to us under the heading “Experts” in such Prospectus.

/s/ DELOITTE & TOUCHE LLP

Los Angeles, California

June 7, 2004