SAN FRANCISCO, Dec. 1 /PRNewswire-FirstCall/ -- Digital Realty Trust, Inc. (NYSE: DLR), the leading owner and manager of corporate and Internet gateway datacenters, has completed a Turn-Key Datacenter(TM) lease agreement with Horizon Data Center Solutions (http://www.horizondcs.com), a premier provider of datacenter managed services. Through this agreement, Horizon will establish a major new datacenter in a Digital Realty Trust property in Dallas to support its growth in that market. Horizon Data Center Solutions works with enterprise clients that run extensive Enterprise Resource Planning (ERP) and Customer Relationship Management (CRM) applications that require significant storage and mission-critical reliability.

"Demand for Horizon's services is growing at a tremendous rate, and this new datacenter will allow us to quickly expand our infrastructure to keep pace with customer requirements. After surveying the market we made the decision to continue our expansion in partnership with Digital Realty Trust and their Turn-Key Datacenter(TM) portfolio. Their 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. Our growth objectives and projections are aggressive, and Digital Realty Trust is a global company with a portfolio of facilities around the world, making them a valuable partner as we move forward," said Lance A. Smith, President and CEO of Horizon.

"Horizon is a great success story, and we are proud to be supporting their growth with this latest project with their team. Horizon is taking advantage of the speed to market and financial advantages of our Turn-Key Datacenter(TM) space, which simplifies the process of establishing a new datacenter, enabling Horizon to dramatically cut the timeline for completing their datacenter project," said Brent Behrman, Vice President of Enterprise Sales at Digital Realty Trust. "Our goal with Horizon is to provide them with space in a Turn-Key facility that is in move-in-ready condition. We provide the state-of-the-art technical specifications and access to power and directly support their green policies through our industry-leading green datacenter program, which has achieved numerous industry firsts for energy efficiency and environmental responsibility in datacenter construction and operations."

Digital Realty Trust's Turn-Key Datacenters(TM) 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(TM) 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(TM) is built using the company's proprietary POD Architecture(TM) 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(TM) and Powered Base Building(TM) 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 74 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 12.9 million rentable square feet as of November 5, 2008, including 1.6 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 http://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. These risks and uncertainties include adverse economic or real estate developments in the Company's markets; reductions in information technology spending; general economic slow-downs or recessions; construction and development delays, difficulties in or inability to lease space, failure to commence rental payments on time under signed leases; tenant bankruptcies; defaults under leases by tenants; increased interest rates; increased operating costs; failure to obtain necessary outside financing; decreased rental rates or increased vacancy rates; difficulties in identifying properties to acquire and completing acquisitions at all or at acceptable return levels; failure to successfully operate acquired properties and operations; failure of acquired properties to perform as expected; reductions in property values; failure to successfully redevelop properties acquired for such purposes or unexpected costs related thereto; failure to maintain the Company's status as a REIT; environmental uncertainties and risks related to natural disasters; financial market fluctuations; changes in foreign currency exchange rates; risks of operating in foreign markets; 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 United States Securities and Exchange Commission, or SEC, including the Company's annual report on Form 10-K for the year ended December 31, 2007 and the Company's quarterly reports on Form 10-Q for the quarters ended March 31, 2008, June 30, 2008 and September 30, 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.

     A. William Stein
     Chief Financial Officer and
     Chief Investment Officer
     Digital Realty Trust, Inc.
     +1 415-738-6500

     Pamela A. Matthews
     Investor/Analyst Information
     Digital Realty Trust, Inc.
     +1 415-738-6500

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

SOURCE Digital Realty Trust, Inc.