New Research Reveals Data Centre Expansion a Priority for European Businesses

LONDON, May 25, 2011 -

- Independent survey commissioned by Digital Realty Trust reveals strong
demand for new data centre space

Digital Realty Trust, Inc. (NYSE: DLR), a leading global wholesale data
centre provider, today revealed the latest results of its annual industry
survey, which show that over eighty percent of participating European
businesses plan to expand their data centre infrastructure over the coming
year. Eighty-two percent of organisations polled reported that they would
either 'definitely' or 'probably' expand their data centre facilities in
2011, with half planning to expand in two or more locations.

The study of IT decision-makers at 205 major UK and European
organisations highlights the strengthening of the data centre market
following the economic downturn. Headline findings include:

    - Of those who intend to expand in 2011:
      - 73 percent plan to do so within Europe, with a majority wanting to
        expand within their own country.
      - The UK proved the most popular target destination, with 37 percent of
        respondents planning to locate a facility there, followed by France
        (30 percent), Germany (26 percent), Spain and the Netherlands (21
        percent each).
      - Capital cities and recognised business hubs remain the location of
        choice for new data centres, with London, Paris, Dublin, Amsterdam
        and Frankfurt proving the most popular locations.
      - Outside of Europe, the US is the next largest target market for
        expansion for European businesses (25 percent), followed by
        Asia-Pacific (21 percent).
    - The main drivers behind expansion are improving security,
      disaster-recovery and implementing a consolidation strategy.

The results for the section of the survey relating to power capacity and
consumption reveal a small increase of respondents measuring power
efficiency. The nominal increase suggests there is still room for
improvement. This is further illustrated by the slight increase in the
average PUE levels since the Company's survey last year:

    - Power capacity per rack in the respondents' existing data centres rose
      by an average of nine percent in 2010 with power density averaging
      5.5kW per rack. 43 percent are using more than 6kW per rack.
    - However, the proportion of respondents measuring their power
      consumption remained unchanged from last year's results, with
      two-thirds currently monitoring their energy usage.
    - Power Usage Effectiveness (PUE) levels were up slightly from last year,
      with the average PUE rating rising to 2.66 from 2.57 in the 2010
      survey.
    - However, 27 percent of those questioned were not aware of the PUE value
      for their organisation's data centres or were not familiar with the
      measurement tool, suggesting that opportunities remain for businesses
      to reduce operating costs related to power consumption as well as the
      environmental impact of their IT load.

The study finds that two-thirds of respondents will seek support from a
partner organisation during the process of acquiring or building a new data
centre facility:

    - Sixty-seven percent will use a partner during the design and
      construction process and/or to lease wholesale space from a partner.
    - The biggest factor cited when choosing a partner organisation is access
      to a greater choice of products, marking a departure from the
      "one-size-fits-all" approach of yesteryear.
    - Advice about regulatory issues is the most important capability a
      partner can offer.
    - Interest in "do-it-yourself" data centres continues to wane, with only
      30 percent of responding companies considering this as an option, down
      four percent from last year.

Adam Levine, VP Europe at Digital Realty Trust, commented, "As a major
investor and developer in the data centre market, the results of the survey
confirm that our product strategy and the geographical areas where we are
concentrating our investments are aligned with the priorities of our core
customer base.

"The survey also highlights the growing importance of power usage
effectiveness (PUE) as a means for customers to monitor the performance of
their facilities. This is another area where we have addressed the needs of
the market. Last year we introduced PowerVU, a web-enabled tool which enables
our customers to monitor their PUE in real-time and therefore optimize their
energy consumption.

"Overall, the survey indicates that the European data centre market is
about to enter a cycle of robust growth. Solutions providers such as Digital
Realty Trust will continue to play an integral role in supporting this
growth. We are confident that we respond positively to the priorities cited
by respondents when they are choosing a partner and that our product range,
our operational experience and financial stability mean that we are well
positioned to be the partner of choice for many of the data centre projects
currently being planned."

Survey Methodology

This independent survey was conducted by Campos Research and Analysis in
January 2011. 205 respondents participated from large companies with at least
pounds Sterling 600m in annual revenues or over 2,000 employees and
headquartered in the UK, Ireland, France, Germany, Spain and the Netherlands.
Respondents are responsible for day-to-day data centre management, contract
execution, implementing new data centres or expanding existing facilities
within their organisations.

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 16.9 million square feet as of April 29, 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 the survey
results, the data centre expansion plans of other companies, power capacity,
usage and monitoring, PUE levels, energy efficiency and lower energy costs,
and expectations regarding the survey respondents' demand for data centre
space, reasons for datacentre expansion, data centre growth locations and the
use of partners in data centre projects. 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; risks associated with using debt to fund its business
activities, including re-financing and interest rate risks, its failure to
repay debt when due, adverse changes in its credit ratings 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
integrate and 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; losses in excess of its insurance coverage; changes in foreign
laws and regulations, including those related to taxation and real estate
ownership and operation; and changes in local, state and federal regulatory
requirements, including 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, 2010 and Quarterly Report on Form 10-Q for the quarter ended March 31,
2011. 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 Datacenter, Powered Base Building and POD Architecture are
registered trademarks of Digital Realty Trust.

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

    A. William Stein    Pamela Matthews Garibaldi   Frederick S. Potter
    Chief Financial      Vice President, Investor   Head of International
      Officer and         Relations                  Operations
    Chief Investment     and Corporate Marketing    Digital Realty Trust,
      Officer           Digital Realty Trust, Inc.   Inc.
    Digital Realty      +1-415-738-6532             +44-207-954-9100
     Trust, Inc.
    +1-415-738-6500

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