The National Conference Center (NCC) is a corporate training facility in Leesburg, Virginia. It hosts over 14,000 individuals per month and comprises 265,000 square feet (24,600 m2) of meeting space, one of the largest in the region. The center contains 250 conference rooms, an athletic facility, and 917 guest rooms.The building was built in 1974 as the Xerox Conference Center at a cost of $55 million. It was designed to assist in copier and technology training for company employees.