POWER OF ATTORNEY
The undersigned hereby constitutes and appoints each of A. William Stein and Rachel K. Muir, signing singly and not jointly,
the undersigned's true and lawful attorney-in-fact to:
(1)  execute for and on behalf of the undersigned, any and all Forms 3, 4, and 5 required to be filed under Section 16(a) 
of the Securities Exchange Act of 1934, as amended, and the rules thereunder with respect to equity securities of Digital 
Realty Trust, Inc. (the "Company");
(2)  do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete 
and execute any and all such Forms 3, 4, or 5 and timely file such form with the United States Securities and Exchange 
Commission and any stock exchange or similar authority; and
(3)  take any other action of any type whatsoever in connection with the foregoing which, in the opinion of such 
attorney-in-fact, may be of benefit to, in the best interest of, or legally required by, the undersigned, it being 
understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Power of 
Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve in such 
attorney-in-fact's discretion.
The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and 
thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, 
as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of 
substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact's 
substitute or substitutes, shall lawfully do or cause to be done by virtue of this Power of Attorney and the rights and 
powers herein granted.  The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at 
the request of the undersigned, are not assuming, nor is the Company assuming, any of the undersigned's responsibilities to 
comply with Section 16 of the Securities Act of 1934, as amended.
This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4,
and 5 with respect to the undersigned's holdings of and transactions in securities issued by the Company, unless earlier 
revoked by the undersigned in a signed writing delivered to the foregoing attorneys-in-fact.
IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 28th day of October, 2004.
/s/ Richard A. Magnuson                
Richard A. Magnuson