Digital Realty Trust and M+W Group Form International Alliance to Provide Build-to-suit Datacentres

Complete Datacentre Solution for Customers without Financing Contingencies

LONDON, March 2, 2011 - Digital Realty Trust, Inc. (NYSE: DLR), a global wholesale datacentre
provider, and M+W Group (www.mwgroup.net), an international
engineering and construction company, have formed an alliance to offer
customers a single source for bespoke enterprise data centre projects in
Europe and Asia. Through this alliance, corporate enterprises and service
providers can utilize M+W Group's and Digital Realty Trust's financial and
technical resources to pursue bespoke-built datacentre projects of any scope
throughout Europe and Asia.

"For the first time, customers have a one-stop shop focused on their
build-to-suit datacentre projects. M+W Group and Digital Realty Trust
together form the single provider for custom build-to-suit datacentres for
enterprise customers without financing contingency risk," said Michael F.
Foust, Chief Executive Officer at Digital Realty Trust.

Mr. Foust added, "Customers benefit from M+W Group's leadership in
international corporate build-to-suit projects completed on time and on
budget as well as Digital Realty Trust's global purchasing arrangements for
data centre components and expertise during the design process. Additionally,
Digital Realty Trust is able to provide customers with a lease structure for
the bespoke datacentre, including the mechanical and electrical plant,
offering a simple financial model that reduces the total cost of ownership."

"The timing is ideal for the emergence of an international developer that
can finance and develop build-to-suit data centres to meet the location and
technical needs of the enterprise customer. Digital Realty Trust is the
world's leading wholesale datacentre provider and M+W Group sets the
standards in international build-to-suit high-tech facilities," said Jurgen
Wild, CEO of M+W Group. "We can contribute our state-of-the-art data-centre
know-how considering best engineering practices for an optimized Total Cost
of Ownership model as well as our particular expertise in energy efficiency
and environmental performance. At a time when most companies are having
difficulty obtaining financing for major construction projects, our alliance
provides a simple, best-in-class process for the delivery of a custom
datacentre facility."

About M+W Group (www.mwgroup.net): M+W Group is the leading global
partner for engineering, construction and project management in the fields of
Advanced Technology Facilities, the Life Science Industries, Energy &
Environment Technologies and High-Tech Infrastructure. From concept
development to turnkey services the company manages projects of all sizes
ensuring rapid realization, high quality standards and cost-effective
completion. With its competence to link process and automation technologies
and complex facilities to integrated solutions M+W Group primarily focuses on
leading electronics, life science, photovoltaic, chemical, automobile and
communication companies, as well as research institutes and universities. M+W
Group GmbH is the holding company with headquarters in Stuttgart, Germany. In
2010 M+W Group generated according to preliminary figures an order intake of
2.1 billion euros and revenues of nearly 1.8 billion euros with a workforce
of approximately 6,000 employees.

M+W Group is owned by the Austrian Stumpf Group that is globally
successful in the areas of High-Tech Engineering, Smart & Renewable Energy,
Real Estate and Technology Investments.

About Digital Realty Trust, Inc.

Digital Realty Trust, Inc. enables customers to deliver critical business
applications by providing secure, reliable and cost effective datacenter
facilities. Digital Realty Trust's customers include domestic and
international companies across multiple industry verticals ranging from
information technology and Internet enterprises, to manufacturing and
financial services. Digital Realty Trust's 96 properties, excluding two
properties held as investments in unconsolidated joint ventures, comprise
approximately 16.8 million square feet as of February 18, 2011, including 2.2
million square feet of space held for redevelopment. Digital Realty Trust's
portfolio is located in 28 markets throughout Europe, North America and
Singapore. Additional information about Digital Realty Trust is included in
the Company Overview, which is available on the Investors page of Digital
Realty Trust's website at www.digitalrealtytrust.co.uk.

Safe Harbor 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 Digital Realty
Trust's alliance with M+W Group. 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 Quarterly
Reports on Form 10-Q for the quarters ended March 31, 2010, June 30, 2010 and
September 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.

Turn-Key Datacentre, Powered Base Building and POD Architecture are
registered trademarks of Digital Realty Trust.

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

    A. William Stein                   Pamela A. Matthews
    Chief Financial Officer and        Vice President, Investor Relations
    Chief Investment Officer           Digital Realty Trust, Inc.
    Digital Realty Trust, Inc.         +1-415-738-6500
    +1-415-738-6500

    Michael Gemeinhardt
    M+W Group
    michael.gemeinhardt@mwgroup.net
    +49-711-8804-1420

A. William Stein, Chief Financial Officer and Chief Investment Officer, or Pamela A. Matthews, Vice President, Investor Relations, both of Digital Realty Trust, Inc., +1-415-738-6500; or Michael Gemeinhardt of M+W Group, +49-711-8804-1420, michael.gemeinhardt at mwgroup.net