Headquarters of the U.S. Department of Defense (Army, Navy and Air Force)
Five-sided building in Arlington County, Virginia, covering 34 acres.
Designed by George Edwin Bergstrom.
Built 1941-43 at a cost of $83 million.
Has five floors and is built of structural steel and reinforced concrete.
Building has five concentric pentagons or rings.
Large concourse within it for Pentagon workers.
One of the world's largest office buildings with three times the floor space of the Empire State Building in New York.
3.7 million square feet of usable floor space for approximately 23,000 people.