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http://www.defenselink.mil/pubs/pentagon/facts.html wrote:
Facts & Figures
The Pentagon—a building, institution, and symbol—was conceived at the request of Brigadier General Brehon B. Sommervell, Chief of the Construction Division of the Office of the Quartermaster General, on a weekend in mid-July 1941. The purpose was to provide a temporary solution to the War Department’s critical shortage of space.The groundbreaking ceremony took place on September 11, 1941. The building was dedicated on January 15, 1943, nearly 16 months to the day after the groundbreaking.

Prime contract awarded 11 August 1941

Mechanical engineering contract awarded 3 September 1941

Construction began 11 September 1941

Grading contract awarded 24 September 1941

First occupants move in 29 April 1942

Construction completed 15 January 1943

Total Land Area (acres) 583

Government Owned (acres) 296

Purchased or condemned (acres) 287

Cost $2,245,000

Area covered by Pentagon bldg (acres) 29

Area of center court (acres) 5

Area of heating and refrigeration plant (acres) 1

Area of sewage structures (acres) 1

Access highways built (miles) 30

Overpasses and bridges built 21

Parking space (acres) 67

Capacity (vehicles) 8,770

Cost of building $49,600,000

Total cost of project (including outside facilities) $83,000,000

Gross floor area (sq. ft.) 6,636,360

Net space for offices, concessions and storage (sq. ft.) 3,705,793

Cubic contents (cu. ft.) 77,015,000

Length of each outer wall (ft.) 921

Height of building (ft.) 77' 3.5"

Number of floors, plus mezzanine and basement 5

Total length of corridors (miles) 17.5

Number of:

Stairways 131

Escalators 19

Elevators 13

Fire hose cabinets 672

Rest Rooms 284

Fixtures 4,900

Drinking fountains 691

Electric clock outlets 7,000

Clocks installed 4,200

Light fixtures 16,250

Lamp replacements (daily) 250

Windows 7,754

Glass area (equals 7.1 acres)(sq. ft.) 309,276

updated: 25-Oct-2000