Digital Realty Trust Completes New Lease Agreement With IBM

Paris, France and London, UK – April 28, 2009 – Digital Realty Trust, Inc. (NYSE: DLR), the world’s largest wholesale datacentre provider, has completed a second Turn-Key DatacentreSM lease agreement with IBM for space at Digital Realty Trust's suburban Paris facility. Under this agreement, IBM will expand its datacentre accommodation capacity in the Digital Realty Trust facility to support growth in demand for its services. The prior agreement was announced in October 2008.

"Our goal is to be a true partner to our customers, by supporting their datacentre strategy and ensure the expansion of their IT teams and facilities through our expertise and resources. This new agreement with IBM in France consolidates our relationship and we are proud to be collaborating with them once again on an important datacentre project," said Bernard Geoghegan, Senior Vice President of International Operations of Digital Realty Trust. "Our Turn-Key DatacentreSM space enables customers to reduce the upfront capital costs for these critical projects while accelerating their ability to deploy new systems. These are very compelling reasons for companies to select Digital Realty Trust as their datacentre partner."

Digital Realty Trust Turn-Key DatacentreSM 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 DatacentresSM 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 DatacentreSM 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 DatacentreSM is built using the company's proprietary POD ArchitectureSM and uses metered power to ensure that clients pay only for the power that they use.