Digital Realty Trust, Inc. Achieves ‘Five 9s’ of Uptime for Fourth Consecutive Year

SAN FRANCISCO - Digital Realty Trust Turn-Key Datacenters(SM) Provide Highly Reliable
Environment for Mission Critical IT Infrastructure

Digital Realty Trust, Inc. (NYSE: DLR), the world’s largest wholesale
datacenter provider, has achieved “five 9s” of uptime in its Turn-Key
Datacenters(SM) once again with a another year of 99.999% availability across
its portfolio of facilities in North America and Europe in 2008. These uptime
metrics are based on a comprehensive evaluation of the company’s Turn-Key
Datacenter(SM) facilities in the US and Europe using standard industry
methodology.

“This is a great validation of how well designed our datacenters are and
how skilled our operations team is. We have exceeded the five-9s benchmark
for four straight years going back to our first year in business as a public
company, and we have been able to do that while dramatically increasing the
number of facilities we own and operate. Our industrialized approach has
proven itself to be applicable not only in construction, but in facility
operations as well,” said Ted Martin, Vice President, Technical Operations at
Digital Realty Trust. “Our unique approach to planning and building Turn-Key
Datacenters plays an important role in their reliability. Equally important,
however, is the intensive commissioning, maintenance processes and advanced
monitoring systems through our Critical Facilities Management(SM) program
that we use to test, fine tune and maintain these data centers.”

Martin added, “At many data center facilities, uptime is often highly
inconsistent and may only average in the four-9s or three-9s range. That may
not sound like a big difference, but that’s going from an average of less
than 5 minutes of downtime for a five 9s facility to more than 500 minutes of
downtime for a facility with reliability only in the three 9s range. Being in
a facility that has a consistent track record of uptime is key for any
mission critical data center.”

Digital Realty Trust Turn-Key Datacenter(SM) 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(SM) 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(SM)
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(SM) is built using the company’s proprietary POD
Architecture(SM) and uses metered power to ensure that clients pay only for
the power that they use.

Only Digital Realty Trust’s Critical Facilities Management(SM) program
combines the three most important elements (manpower, documentation and
systems management) of successful data center operations management within a
single offering. Digital Realty Trust draws upon its expertise of managing
approximately two million square feet of data center space worldwide in
developing this data center management solution. This high level of
experience has enabled us to develop an offering that assists customers in
optimizing the efficiency of their data centers to increase cost
effectiveness and green operation. Unlike other providers who provide only
partial monitoring and data center management solutions, Digital Realty Trust
has adopted a “best-of-breed” strategy to bring the industry leading Building
Management System (BMS), Security Access Control System (SACS), and
Computerized Maintenance Management System (CMMS) platforms together in a
single offering to provide users with the most comprehensive monitoring and
control capability possible via our secure communications network.

About Digital Realty Trust, Inc.

Digital Realty Trust owns, acquires, redevelops, develops and manages
technology-related real estate. The Company is focused on providing Turn-Key
Datacenter(SM) and Powered Base Building(SM) 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 75 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 13.0 million square feet as of February 26,
2009, including 1.6 million square feet of space held for redevelopment,
Digital Realty Trust’s portfolio is located in 27 markets throughout Europe
and North America. For additional information, please visit Digital Realty
Trust’s website at www.digitalrealtytrust.com.

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 future reliability of our
Turn-Key Datacenters(SM). These risks and uncertainties include the impact of
the current deterioration in the global economy, including the turmoil in the
financial and credit markets; the downturn of 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; decreases in real estate valuations and resulting impairment charges; our
dependence upon significant tenants; bankruptcy or insolvency of one or more
major tenants 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 for refinancing current debt obligations, undertaking or
completing redevelopment, completing acquisitions or other purposes;
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
documents; 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
certain of these 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;
inability to successfully redevelop 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; possible 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; 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 United States Securities and Exchange
Commission, including the Company’s annual report on Form 10-K for the year
ended December 31, 2008. 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 Investor/Analyst Information
Chief Investment Officer Digital Realty Trust, Inc.
Digital Realty Trust, Inc. +1-415-738-6500
+1-415-738-6500

Chris Crosby
Sales & Technical Services
Digital Realty Trust, Inc.
+1-214-231-1350

Source: Digital Realty Trust, Inc.

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 Chris Crosby, Sales & Technical Services, +1-214-231-1350, all of Digital Realty Trust, Inc.