Background for September 11th
The Pentagon is the home of the Department of Defense, with which it is synonymous. It is the most identifiable symbol of U.S. military might.
The Pentagon is the largest office building in the world, with a total floor area of 6,500,000 square feet. Of that 3,800,000 square feet are covered by offices, storage and concessions. That makes the Pentagon about 2,000 times the size of a typical house. The facade of the building is 77 feet high. Each of the five outside walls is 921 feet long. It has a total of 17.5 miles of corridors. The building occupies 29 acres of its 583 acre site, and its a central courtyard covers 5 acres. The 67 acre parking lot has 8,770 spaces for vehicles. There are 7,754 windows, 131 stairways, 19 escalators, 13 elevators, and 284 restrooms. 1
The Pentagon not only has five sides; it has five floors, and five concentric rings. Ten corridors run perpendicular to the rings and connect them.
Sixty years to the day before the September 11th attack, in 1941, ground was broken for the huge building. 2
2. The Pentagon: Facts & Figures, defenselink.mil,