The New Office Building was built from 1968 to 1973 to serve as office space for the Air Force Command Headquarters. It was built in two stages, first as two northerly extensions to the east and west wings of Number 2 Hall, and second an elongated connecting structure between these two extensions, creating an inner courtyard. The facades of the New Office Building follow existing proportions and brickwork of Number 2 Hall, and appeared in photographs as a popular backdrop for family visits and exhibitions.