Man Group Signs Turn-Key Datacentre(R) Lease With Digital Realty Trust

New 10-Year Turn-Key Datacentre(R) Lease Delivers Secure and Reliable Disaster Recovery Site

DUBLIN, January 18, 2011 - Digital Realty Trust, Inc. (NYSE: DLR), a global wholesale data centre
provider, has signed a 10-year Turn-Key Datacentre(R) lease agreement with
Man Group plc ("Man"), an alternative investment management business. The
lease, which represents over half a megawatt of IT load, provides Man Group
with a secure, reliable and cost effective facility to support its critical
business applications through a disaster recovery site.

"We were impressed by Digital Realty Trust's track record of providing
its customers with secure and reliable data centre facilities," said Ken
Clunie, Director, Building Projects at Man. "It was clear that they maintain
consistently high operating standards and have an extensive history in large
scale data centre development projects. Reliable facilities are critical to
our business model."

Adam Levine, European Vice President, at Digital Realty Trust, said: "By
selecting our Turn-Key Datacentre(R), Man will benefit from our advanced
cooling, power, redundancy, and sustainability features that ensure uptime
reliability as well as operating efficiencies. Digital Realty Trust's
guaranteed delivery of the Turn-Key Datacentre facility on time and on budget
takes a significant amount of financial risk and uncertainty out of the
process for our customers. Mitigating this risk has become essential to
organisations looking to expand their infrastructure in the current economy."

About Digital Realty Trust, Inc.

Digital Realty Trust, Inc. enables customers to deliver critical business
applications by providing secure, reliable and cost effective datacentre
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 December 9, 2010, including 2.3
million square feet of space held for redevelopment. Digital Realty Trust's
portfolio is located in 28 markets throughout Europe, North America and
Singapore. For additional information, please visit Digital Realty Trust's
website at www.digitalrealtytrust.co.uk.

About Man

Man is a world-leading alternative investment management business. It has
expertise in a wide range of liquid investment styles including managed
futures, equity, credit, emerging markets, global macro and multi-manager,
combined with powerful product structuring, distribution and client service
capabilities. Man manages around USD$67 billion (As at 31 October 2010).

The original business was founded in 1783. Today, Man Group plc is listed
on the London Stock Exchange and is a member of the FTSE 100 Index with a
market capitalisation of around 4.5 billion pounds Sterling (As at 30
September 2010).

Man Group is a member of the Dow Jones Sustainability World Index and the
FTSE4Good Index. Man also supports many awards, charities and initiatives
around the world, including sponsorship of the Man Booker literary prizes.
Further information can be found at www.mangroupplc.com.

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 the new lease
with Man Group and expected benefits from the features 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 centre 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.

    For Additional Information:
    ---------------------------
    A. William Stein            Pamela A. Matthews   Frederick S. Potter
    Chief Financial Officer     Investor/Analyst     Head of International
     and Chief Investment        Information          Operations
     Officer                    Digital Realty       Digital Realty
    Digital Realty              Trust, Inc.          Trust, Inc.
    Trust, Inc.                 +1-415-738-6500      +44-207-954-9100
    +1-415-738-6500

A. William Stein, Chief Financial Officer and Chief Investment Officer, or Pamela A. Matthews, Investor/Analyst Information, +1-415-738-6500, or Frederick S. Potter, Head of International Operations, +44-207-954-9100, all of Digital Realty Trust, Inc.