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 12th day of February, 2013.



/s/ Kris Kumar
Name:	Kris Kumar