Alter Group, which owns 18 business parks nationwide, said the two six-story buildings could support as much as 300,000 square feet of office space near the intersection of Routes 28 and 50.

CSX Realty Development LLC, an affiliate of CSX Transportation Inc., owns the land.

The buildings will be part of a 1,100-acre business park anchored by the National Reconnaissance Office, a federal agency that designs, builds and operates the nation's reconnaissance satellites. Alter plans to market the space through Grubb & Ellis Co. to defense contractors eager to be near NRO. Dulles International Airport is three miles north of the park.

No tenants have committed to the buildings, but two "major office users" have expressed interest in the space, which should be ready in 18 to 24 months, said Matthew A. Ward, Alter's senior vice president. Tenants that moved into the business park in the past two years include Northrop Grumman Corp., Aerospace Corp., Computer Sciences Corp. and Science Applications International Corp., Ward said.

He said that Alter had hired Hickok Warner Cole Architects to handle the design and that the company was talking with Fairfax County officials "to make sure our product is complementary with the county's vision for the project."

Reproduced with permission of the copyright owner. Further reproduction or distribution is prohibited without permission.