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(ARDEN LOGO)   Securities and Exchange Commission Washington, D.C. 20549
 Amendment No. 1
to Form 10-K on FORM 10-K/A
 þ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
SECURITIES AND EXCHANGE ACT OF 1934. For the fiscal year ended December 31, 2004 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
SECURITIES AND EXCHANGE ACT OF 1934 For the transition period from            to Commission File Number 1-12193 ARDEN REALTY, INC.  Maryland
    
    95-4578533(State or other jurisdiction of incorporation or organization)
    
    (I.R.S. Employer Identification No.)
 11601 Wilshire Boulevard, 4th Floor
Los Angeles, California 90025-1740
(Address and zip code of principal executive offices) Registrants telephone number, including area code: (310) 966-2600 Securities registered pursuant to Section 12(b) of the Act: Title of each class
    
    Name of each exchange on which registeredCommon Stock, $0.01 par value
    
    New York Stock ExchangePreferred Stock Purchase Rights
    
    New York Stock Exchange
 Securities registered pursuant to Section 12(g) of the Act: None Indicate by checkmark whether the Registrant (1) has filed all reports required to be filed by
Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for
such shorter period that the Registrant was required to file such reports), and (2) has been
subject to such filing requirements for the past 90 days. Yes þ No o Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is
not contained herein, and will not be contained to the best of the Registrants knowledge, in
definitive proxy or information statements incorporated by reference in Part III of this Form 10-K,
or any amendment to this Form 10-K. þ Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of
the Act). Yes þ No o The aggregate market value of the shares of common stock held by non-affiliates was approximately
$1.9 billion based on the closing price on the New York Stock Exchange for such shares on June 30,
2004. The number of the Registrants shares of common stock outstanding was 66,364,703 as of March 10,
2005. DOCUMENTS INCORPORATED BY REFERENCE Part III of this report incorporates information by reference from the definitive Proxy Statement for the 2005 Annual Meeting of Stockholders.




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TABLE OF CONTENTS  PART IVITEM 15. EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-KSIGNATURESExhibit 31.1Exhibit 31.2    Table of Contents  EXPLANATORY NOTE This amendment to the Form 10-K of Arden Realty, Inc. is filed to correct the
certification of the Chief Executive Officer under Rule 13a-14(a) or Rule 15d-14(a), filed as
exhibit 31.1, and the certifications of the Chief Financial Officer and certain other executive
officers under Rule 13a-14(a) or Rule 15d-14(a), filed as exhibit 31.2. The exhibits 31.1 and 31.2
originally filed inadvertently omitted reference to the companys internal control over financial
reporting.




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PART IV 
 ITEM 15.EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K (c) Exhibits ExhibitNumber
    
    Description31.1*
    
    Certification of Chief Executive Officer, pursuant to Rule
13a-14(a) or Rule 15d-14(a) promulgated under the Exchange
Act, as created by Section 302 of the Sarbanes-Oxley Act of
2002.31.2*
    
    Certification of Chief Financial Officer and certain other
executive officers, pursuant to Rule 13a-14(a) or Rule
15d-14(a) promulgated under the Exchange Act, as created by
Section 302 of the Sarbanes-Oxley Act of 2002.
   (*)
    
    Filed herewith.




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SIGNATURES Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto
duly authorized on April 14, 2005. ARDEN REALTY, INC.By:
    /s/ RICHARD S. ZIMANRichard S. ZimanChairman of the Board
and Chief Executive Officer Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been
signed below by the following persons on behalf of the registrant and in the capacities and on the
dates indicated. Name
    
    Title
    
    Date/s/ RICHARD S. ZIMAN
    
    Chairman of the Board, Chief Executive Officer and Director
    
    April 14, 2005Richard S. Ziman/s/ VICTOR J. COLEMAN
    
    President, Chief Operating Officer and Director
    
    April 14, 2005Victor J. Coleman/s/ RICHARD S. DAVIS
    
    Executive Vice President and Chief Financial Officer
    
    April 14, 2005Richard S. Davis/s/ ROBERT C. PEDDICORD
    
    Executive Vice President  Leasing and Property Operations
    
    April 14, 2005Robert C. Peddicord/s/ LESLIE E. BIDER
    
    Director
    
    April 14, 2005Leslie E. Bider/s/ CARL D. COVITZ
    
    Director
    
    April 14, 2005Carl D. Covitz/s/ LARRY S. FLAX
    
    Director
    
    April 14, 2005Larry S. Flax/s/ STEVEN C. GOOD
    
    Director
    
    April 14, 2005Steven C. Good/s/ ALAN I. ROTHENBERG
    
    Director
    
    April 14, 2005Alan I. Rothenberg