Digital Realty Trust Launches PowerVU, the Datacenter Industry's First Packaged Energy Management Solution

PowerVU Provides Digital Realty Trust Turn-Key Datacenter(R) Customers with Critical Data to Effectively Manage Energy Usage

SAN FRANCISCO, May 24, 2010 - Digital Realty Trust, Inc. (NYSE: DLR), the world's largest wholesale
datacenter provider, has unveiled a powerful new tool that will enable
customers to increase datacenter energy efficiency and reduce power costs.
PowerVU is the industry's first packaged solution for centralized monitoring
and management of datacenter power consumption, energy efficiency and load
analysis.

"Energy efficiency is the centerpiece of any company's effort to control
the cost of their datacenter's power consumption. Until now outsourced
providers have not offered much in the way of support to meet customers'
energy efficiency initiatives. We developed PowerVU to give customers a
packaged solution that consolidates critical information and helps them take
the appropriate steps to effectively reduce energy consumption," said Jim
Smith, Chief Technology Officer of Digital Realty Trust.

PowerVU tracks and displays energy usage by metered component, giving
customers the ability to monitor actual power demand and usage in kW/hour
from a simple, easy-to-read dashboard. PowerVU also provides PUE and IT load
analysis by giving customers a graphical display of PUE as well as its two
determinate components, utility input and UPS output. This enables customers
to monitor their energy efficiency daily, monthly and annually, providing
critical information for budgeting and planning. PowerVU also enables
customers to analyze usage down to component level so they can manage all
their energy usage effecting components.

PowerVU will become a standard component in all new Turn-Key
Datacenters(R) ordered after June 1, 2010.

For more information about PowerVU, visit
www.digitalrealtytrust.com/powervu.

Digital Realty Trust Turn-Key Datacenter facilities provide
state-of-the-art environments for supporting mission critical infrastructure,
with advanced cooling, power, redundancy, and sustainability features to
ensure that critical applications are available while optimizing energy
efficiency. Digital Realty Trust's Turn-Key Datacenters are scalable from
hundreds of kilowatts of IT Load to megawatts of IT load and are located in
markets throughout North America and Europe. Each Turn-Key Datacenter
facility is physically secure and features a state-of-the-art power and
cooling architecture that has been optimized for green operation. Every
Turn-Key Datacenter 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. owns, acquires, redevelops, develops and
manages technology-related real estate. The Company is focused on providing
Turn-Key Datacenter(R) and Powered Base Building(R) datacenter 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 85 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 datacenter
tenants. Comprising approximately 15.1 million rentable square feet as of May
10, 2010, including 1.9 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.com.

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

Safe Harbor 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 PowerVU. 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 our geographic markets; decreases in information
technology spending, including as a result of economic slowdowns or
recession; adverse economic or real estate developments in our industry or
the industry sectors that we sell to (including risks relating to decreasing
real estate valuations and impairment charges); our 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; our failure to obtain necessary debt and equity financing;
increased interest rates and operating costs; our failure to repay debt when
due or our breach of covenants or other terms contained in our loan
facilities and agreements; financial market fluctuations; changes in foreign
currency exchange rates; our ability to manage our growth effectively;
difficulty acquiring or operating properties in foreign jurisdictions; our
failure to successfully operate acquired or redeveloped properties; risks
related to joint venture investments, including as a result of our 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 datacenter space; our
inability to successfully develop and lease new properties and space held for
redevelopment; difficulties in identifying properties to acquire and
completing acquisitions; our inability to acquire off-market properties; our
inability to comply with the rules and regulations applicable to public
companies; our failure to maintain our status as a REIT; potential adverse
changes to tax laws; restrictions on our 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 Report on Form 10-Q for
the quarter ended March 31, 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
    Chief Financial Officer and    Director of Investor Relations
    Chief Investment Officer       Digital Realty Trust, Inc.
    Digital Realty Trust, Inc.     +1-415-738-6500
    +1-415-738-6500

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