POWER OF ATTORNEY

      KNOW ALL BY THESE PRESENTS, that the undersigned hereby constitutes and
appoints each of A. William Stein, Joshua A. Mills and S. Ryan Black, or each of them singly, to
be the undersigned's true and lawful attorney-in-fact to:

      (1)	prepare, execute in the undersigned's name and on the undersigned's
behalf, and submit to the U.S. Securities and Exchange Commission (the "SEC") a Form
ID, including amendments thereto, and any other documents necessary or appropriate to
obtain codes and passwords enabling the undersigned to make electronic filings with the
SEC of reports required by Section 16(a) of the Securities Exchange Act of 1934 or any
rule or regulation of the SEC;

      (2)	execute for and on behalf of the undersigned, in the undersigned's
capacity as an officer, director and/or stockholder of Digital Realty Trust, Inc. and, in
Digital Realty Trust, Inc.'s capacity as general partner of Digital Realty Trust, L.P.,
Digital Realty Trust, L.P. (together, the "Company"), Forms 3, 4, and 5 and amendments
thereto in accordance with Section 16(a) of the Securities Exchange Act of 1934 and the
rules thereunder;

      (3)	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 such Form 3, 4, or 5
and any amendments thereto and timely file such forms with the SEC and any stock
exchange or similar authority, including, but not limited to, taking any actions necessary
or desirable in connection with effectuating electronic filings; and

      (4)	take any other action of any type whatsoever which, in the opinion of such
attorney-in-fact, may be necessary or desirable in connection with the foregoing
authority, 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 Exchange Act of 1934.

      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.  This Power of Attorney may be filed with
the SEC as a confirming statement of the authority granted herein.

      IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 13th day of February, 2013.




/s/ A. William Stein
Name:	A. William Stein