The UNICOM Technology Park Conference Center is located between 15000 and 15010 Conference Center Drive, Chantilly, VA 20151. The complex is less than a half-mile from the Westfields Marriott.
The entrance to the conference center (see picture at right) is down from the main entrance to the building. See the aerial view below that shows the main entrance, the conference center entrance, and the parking area for conference center visitors.