The Pentagon is theheadquarters building of theUnited States Department of Defense. As a symbol of theU.S. military, the phraseThe Pentagon is also often used as ametonym for the Department of Defense and its leadership. Located inArlington County, Virginia, across thePotomac River fromWashington, D.C., the building was designed by American architectGeorge Bergstrom and built by contractorJohn McShain. Ground was broken on 11 September 1941, and the building was dedicated on 15 January 1943.
The Pentagon is the world'slargest office building, with about 6.5 million square feet (150 acres; 60 ha) offloor space, of which 3.7 million sq ft (85 acres; 34 ha) are used as offices. Some 23,000military andcivilian employees, and another 3,000 non-defense support personnel, work in the Pentagon.
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