Digital Realty Trust Signs Powered Base Building(R) Lease Agreement With Hosting Solutions International

Signed in London, Delivered in St. Louis - A Global Solution for an International Business

DUBLIN, September 16, 2010 - Digital Realty Trust, Inc. (NYSE: DLR), the world's largest wholesale
data centre provider, has signed a Powered Base Building(R) lease agreement
totaling approximately 14,000 square feet with Hosting Solutions
International at Digital Realty Trust's property in St. Louis, Missouri.

"The Powered Base Buildings(R) solution from Digital Realty Trust matched
our requirements exactly, and provided us with the flexibility we were
seeking," commented Jochen Berger, CTO at Hosting Solutions International.
"By partnering with Digital Realty Trust, we received very useful insights
into the North American data centre market, and particularly appreciated the
opportunity to complete the deal in London despite the facility being located
in St. Louis. Additionally, because of the way we've planned this facility
with Digital Realty Trust, our new data centre is designed to a high
environmental standard."

"Hosting Solutions International has extended its reach into North
America, and wanted a trusted partner to support this expansion. The Powered
Base Building(R) lease in St. Louis was negotiated in the UK, demonstrating
the benefit of using a global provider such as Digital Realty Trust," said
Bernard Geoghegan, Senior Vice President of International Operations for
Digital Realty Trust. "With our European headquarters in Dublin, and offices
in London and Paris, we are ideally positioned to serve companies such as
Hosting Solutions International. Combining this European presence with the
local understanding of the U.S. market has been very important in meeting
Hosting Solutions International's requirements."

Digital Realty Trust's Powered Base Buildings are improved shell and core
facilities that enable firms to build out and operate a data centre using
their own personnel. These facilities possess the infrastructure elements
(power, planning permission, and access to fiber) necessary to immediately
begin datacentre construction efforts. Digital Realty Trust's Powered Base
Buildings are also designed to meet the two leading green building standards,
LEED and BREEAM, and are pre-qualified with power, planning and fiber
connectivity.

About Digital Realty Trust, Inc.

Digital Realty Trust, Inc. (the Company) is the world's largest wholesale
data centre provider. The Company is focused on providing Turn-Key
Datacentre(R) and Powered Base Building(R) datacentre solutions for domestic
and international tenants across a variety of industry verticals ranging from
information technology and Internet enterprises, to manufacturing and
financial services. Digital Realty Trust's 95 properties, excluding one
property held as an investment in an unconsolidated joint venture, contain
applications and operations critical to the day-to-day operations of
technology industry tenants and corporate enterprise datacentre tenants.
Comprising approximately 16.7 million rentable square feet as of August 30,
2010, including 2.1 million square feet of space held for redevelopment,
Digital Realty Trust's portfolio is located in 27 markets throughout North
America and Europe. For additional information, please visit Digital Realty
Trust's website at www.digitalrealtytrust.co.uk.

About Hosting Solutions International

Hosting Solutions International Inc. (HSI) was founded in 2003 and is the
U.S. subsidiary of Germany-based PlusServer AG. HSI supplies hosting services
for international customers with its three brands serverloft, SERVER4YOU and
Server01. With its remarkable price policy and the comprehensive product
range including dedicated servers as well as virtual private servers, the
company truly co-determines the web hosting market. HSI customers may choose
between two server locations in the USA and Europe. The St. Louis data center
is situated right in the center of the United States, thus granting fast
connections throughout the entire continent; the new data center in
Strasbourg is currently Europe's most eco-friendly data center.

Safe Harbour Statement

This press release contains forward-looking statements which are based on
Digital Realty Trust, Inc.'s current expectations, forecasts and assumptions
that involve risks and uncertainties that could cause actual outcomes and
results to differ materially, including statements related to the new Powered
Base Building lease and the planning of the facility. These risks and
uncertainties include, among others, the following: the impact of the recent
deterioration in global economic, credit and market conditions; current local
economic conditions in its geographic markets; decreases in information
technology spending, including as a result of economic slowdowns or
recession; adverse economic or real estate developments in its industry or
the industry sectors that it sells to (including risks relating to decreasing
real estate valuations and impairment charges); its dependence upon
significant tenants; bankruptcy or insolvency of a major tenant or a
significant number of smaller tenants; defaults on or non-renewal of leases
by tenants; its failure to obtain necessary debt and equity financing;
increased interest rates and operating costs; its failure to repay debt when
due or its breach of covenants or other terms contained in its loan
facilities and agreements; financial market fluctuations; changes in foreign
currency exchange rates; its inability to manage its growth effectively;
difficulty acquiring or operating properties in foreign jurisdictions; its
failure to successfully operate acquired or redeveloped properties; risks
related to joint venture investments, including as a result of its lack of
control of such investments; delays or unexpected costs in development or
redevelopment of properties; decreased rental rates or increased vacancy
rates; increased competition or available supply of data center space; its
inability to successfully develop and lease new properties and space held for
redevelopment; difficulties in identifying properties to acquire and
completing acquisitions; its inability to acquire off-market properties; its
inability to comply with the rules and regulations applicable to reporting
companies; its failure to maintain its status as a REIT; possible adverse
changes to tax laws; restrictions on its ability to engage in certain
business activities; environmental uncertainties and risks related to natural
disasters; changes in foreign laws and regulations, including those related
to taxation and real estate ownership and operation; and changes in real
estate and zoning laws and increases in real property tax rates. For a
further list and description of such risks and uncertainties, see the reports
and other filings by Digital Realty Trust, Inc. with the U.S. Securities and
Exchange Commission, including Digital Realty Trust, Inc.'s Annual Report on
Form 10-K for the year ended December 31, 2009 and Digital Realty Trust,
Inc.'s Quarterly Reports on Form 10-Q for the quarters ended March 31, 2010
and June 30, 2010. Digital Realty Trust, Inc. disclaims any intention or
obligation to update or revise any forward-looking statements, whether as a
result of new information, future events or otherwise.

    For Additional Information:
    --------------------------

    A. William Stein    Pamela A. Matthews      Bernard Geoghegan
    Chief Financial     Investor/Analyst        SVP, International
     Officer and         Information             Operations
    Chief Investment    Digital Realty Trust,   Digital Realty Trust,
     Officer             Inc.                    Inc.
    Digital Realty
     Trust, Inc.        +1-415-738-6500         +353-1-245-0650
    +1-415-738-6500

A. William Stein, Chief Financial Officer and Chief Investment Officer, +1-415-738-6500; or Pamela A. Matthews, Investor/Analyst Information, +1-415-738-6500; or Bernard Geoghegan, SVP, International Operations, +353-1-245-0650, all of Digital Realty Trust, Inc.