Digital Realty Trust and IBM Expand Global Relationship with New Lease in Paris Facility

IBM leases Turn-Key Datacentre space at Digital Realty Trust property in Paris

DUBLIN, September 21, 2010 - Digital Realty Trust, Inc. (NYSE: DLR), the world's largest datacentre
provider, has extended its international relationship with IBM through the
completion of a new Turn-Key Datacentre(R) lease agreement, expanding IBM's
datacentre footprint in Digital Realty Trust's suburban Paris facility.

"This new agreement highlights Digital Realty Trust's ongoing support for
IBM's datacentre strategy, and reinforces the global nature of our
partnership," said Bernard Geoghegan, Senior Vice President of International
Operations of Digital Realty Trust. "Our facility in Paris provides the ideal
datacenter solution for IBM. Our Turn-Key Datacentre(R) allows IBM to
accelerate the deployment of new datacentres while reducing its capital costs
and fully meeting the needs of its CAC40 customer."

"We have a strong working relationship with Digital Realty Trust, which
is founded on the flexibility and reliability of its Turn-Key Datacentre(R)
solution," commented Mathieu Louvrier, Business Continuity and Recovery
Services Director at IBM France. "When we need more space, or should we need
to scale up our IT load, we know that in a Digital Realty Trust facility we
have that option. Furthermore, they have provided us with energy-saving
technologies which are helping reduce our environmental footprint, while
reducing operational costs. Our partnership with Digital Realty Trust has
proven invaluable, particularly in the French data centre market."

Digital Realty Trust's Turn-Key Datacentre(R) facilities provide
state-of-the-art environments to house mission critical infrastructure, by
providing advanced cooling, power, redundancy, and sustainability features.
This guarantees that critical applications are available while optimising
energy efficiency. Digital Realty Trust's Turn-Key Datacentres(R) are
scalable from hundreds of kilowatts of IT load to megawatts of IT load and
are located in markets throughout Europe and North America. Each Turn-Key
Datacentre(R) facility is physically secure and features a state-of-the-art
power and cooling architecture that has been optimised for green operation.
Every Turn-Key Datacentre(R) is built using the Company's proprietary POD
Architecture(R) and uses metered power to ensure that clients pay only for
the power that they use.

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.

Safe Harbour Statement

This press release contains forward-looking statements which are based on
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 Company's Turn-Key Datacentre
solutions, accelerating deployment of new datacentres and reducing capital
costs. 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 the Company's geographic
markets; decreases in information technology spending, including as a result
of economic slowdowns or recession; adverse economic or real estate
developments in the Company's industry or the industry sectors that the
Company sells to (including risks relating to decreasing real estate
valuations and impairment charges); the Company's 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; the
Company's failure to obtain necessary debt and equity financing; increased
interest rates and operating costs; the Company's 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; the Company's inability to manage its growth
effectively; difficulty acquiring or operating properties in foreign
jurisdictions; the Company's failure to successfully operate acquired or
redeveloped properties; risks related to joint venture investments, including
as a result of the Company's 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; the Company's inability to successfully develop
and lease new properties and space held for redevelopment; difficulties in
identifying properties to acquire and completing acquisitions; the Company's
inability to acquire off-market properties; the Company's inability to comply
with the rules and regulations applicable to reporting companies; the
Company's failure to maintain its status as a REIT; possible adverse changes
to tax laws; restrictions on the Company's 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 the Company with the U.S. Securities and Exchange
Commission, including the Company's Annual Report on Form 10-K for the year
ended December 31, 2009 and the Company's Quarterly Reports on Form 10-Q for
the quarters ended March 31, 2010 and June 30, 2010. The Company 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       Digital Realty Trust, Inc.
     Officer              Trust, Inc.
    +1-415-738-6500      +1-415-738-6532      +353-1-245-0650

A. William Stein, Chief Financial Officer and Chief Investment Officer, +1-415-738-6500, or Pamela A. Matthews, Investor/Analyst Information, +1-415-738-6532, or Bernard Geoghegan, SVP, International Operations, +353-1-245-0650, all of Digital Realty Trust, Inc.