3. There are a few reasons the building is so short.
One of Somervell’s first dictates was that the massive building be no taller than five stories (plus two stories below ground). This was due, in part, to concerns over disrupting the scenic views to and from the Virginia site and Washington, D.C. There was also a more practical reason–the steel shortage already underway in a nation girding for war. Instead of steel, the building was built primarily of reinforced concrete, 435,000 cubic yards of it. Much of the filler for this concrete was dredged from the grounds around the Pentagon itself, including the Potomac River. Concrete was also used to build a series of ramps throughout the complex, which eliminated the need for steel-enforced elevators. Additional concessions to the war included the lack of bronze doors, plaques and any other touches that were deemed purely decorative.
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