ACC4

Ashburn, VA

ACC4 is situated on 17 acres of land at the Ashburn Corporate Center in Loudoun County, Virginia. Ground-up development began in 2006. We consider ACC4 to be our prototype for future ground-up development projects. We believe that its flexible design and enhanced power and cooling capacity make it one of the leading data center facilities in the world. The raised square footage is divided into 20 separate computer rooms, each of which is served by an independent and dedicated critical electrical backup system. This design enables each computer room to function independently and provides us with greater pricing power and the ability to structure flexible leases to meet the demands of our tenants.

In the aggregate, ACC4 will consist of approximately 300,000 gross square feet (not including 40,000 square feet dedicated to housing generators) and 171,300 raised square feet, with a critical load of 36.4 MW. The first phase of this facility, or ACC4 Phase I, was completed on July 1, 2007. ACC4 Phase I comprises approximately 150,000 gross square feet and 85,700 raised square feet with an aggregate critical load of 18.2 MW divided among 10 computer rooms as follows: 2.275 MW going to each of six computer rooms and 1.1375 MW to each of the remaining computer rooms. ACC4 Phase II with an aggregate critical load of 18.2 MW was completed November 1, 2007. Phase I and Phase II are complete and the building is operational.