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The Pentagon is the headquarters of the United States Department of Defense, in Arlington County, Virginia, across the Potomac River from Washington, D.C. The building was constructed on an... Wikipedia

Style: Classical Revival, Modern, and Stripped Classicism
Location: Richmond Hwy/SR 110 at I-395, Arlington County, Virginia, U.S.
Construction started: September 11, 1941
Completed: January 15, 1943
Cost: $83 million (equivalent to $ in Error: undefined index "US-GDP" when using.)
Owner: United States Department of Defense
Roof: 77 ft (23.47 m)
Floors: 7 (2 underground)
Floor area: 6,636,360 sq ft (616,538.02 m²)
Architect: George Bergstrom, David J. Witmer
Main contractor: John McShain, Inc.
Parking: 67 acres
Data source: DuckDuckGo