POWER OF ATTORNEYKNOW ALL PERSONS BY THESE PRESENTS that the person whose signature
appears below does hereby make, constitute and appoint each of Joshua A. Mills and
Barbara Polster as a true and lawful attorney-in-fact of the undersigned with full powers
of substitution and revocation, for and in the name, place and stead of the undersigned
(both in the undersigned's individual capacity and as an officer or member of the board
of directors) to execute and deliver such forms as may be required to be filed from time
to time with the Securities and Exchange Commission with respect to any investments of
Digital Realty Trust Inc. (including any amendments or supplements to any reports from
schedules previously filed by such persons or entities) including any joint filing
agreements or joint filer information statements in connection therewith, with respect to
any subsidiary of Digital Realty Trust, Inc.: (i) pursuant to Sections 13(d) and 16(a) of
the Securities Exchange Act of 1934, as amended, including without limitation Schedules
13D and 13G, statements on Form 3, Form 4 and Form 5 and (ii) in connection with any
applications for EDGAR access codes, including without limitation the Form ID.
/s/ A. William Stein
Chief Financial Officer & Chief Investment OfficerDecember 11, 2006