Builders FirstSource Select Digital Realty Datacenters

San Francisco – October 25, 2005 – Digital Realty Trust, Inc. (NYSE: DLR), the leading owner and manager of corporate data centers and Internet gateways, today announced that Builders FirstSource (www.bldr.com), a leading supplier of structural building products to new home builders, has selected a Digital Realty Trust Turn-Key Datacenter Facility to house the company’s new datacenter.

“We chose Digital Realty Trust because of the quality and location of its facilities, the expertise of its staff, and the availability of high-speed networks from a wide range of service providers,” said Skip McDonald, Vice President and CIO of Builders FirstSource. “At each step in the process, their team demonstrated that they truly wanted to work with us and that they understood our technical and business needs. That has given us a high level of confidence in Digital Realty Trust as our partner for supporting Builders FirstSource’s critical systems.”

“Working with Builders FirstSource has been a very productive collaboration, and it exemplifies Digital Realty Trust’s unique value proposition,” said Michael F. Foust, Chief Executive Officer of Digital Realty Trust. “We offer enterprise tenants move-in ready datacenter space that provides access to a wide range of carriers in a truly neutral environment. The result is an environment that allows tenants like Builders FirstSource to meet all of their current and future technical needs in a competitive environment that ensure cost-effectiveness.”

Builders FirstSource is a leading supplier and manufacturer of structural and related building products for residential new construction in the United States. Based on information obtained from Builders FirstSource, the company operates 50 manufacturing facilities and 62 distribution centers in 11 states. Manufacturing facilities include plants that manufacture roof and floor trusses, wall panels, stairs, aluminum and vinyl windows, custom millwork and pre-hung doors. Builders FirstSource also distributes windows, interior and exterior doors, dimensional lumber and lumber sheet goods, millwork and other building products.

Digital Realty Trust’s Turn-Key Datacenter Facilities are move-in ready, physically secure facilities with the power and cooling capabilities to support critical enterprise applications. Digital Realty Trust offers scalability from a hundred square feet to thousands of square feet in state-of-the-art facilities with true carrier and managed service provider neutrality. Digital Realty Trust’s facilities are fully managed by its world-class operations and engineering teams to support 24/7 mission-critical applications.

About Digital Realty Trust, Inc.

Digital Realty Trust, Inc. owns, acquires, repositions and manages technology-related real estate. The Company’s [38] properties contain applications and operations critical to the day-to-day operations of technology industry tenants and corporate enterprise datacenter tenants. Comprising approximately [8.2] million net rentable square feet, excluding space held for redevelopment, Digital Realty Trust’s property portfolio is located throughout the United States and in Western Europe. For additional information, please visit the company’s website at www.digitalrealtytrust.com.