Correction for the size of The Pentagon
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How big is 19 acres?
It's about three-fifths as big as The Pentagon
The size of The Pentagon is about 34.10 acres.
(a.k.a. United States Department of Defense Headquarters) (Washington, D.C.) (total floor area)
The Pentagon, the world's largest office building, contains a total floor area of 34.10 acres. Built during World War II, the designers compensated for the steel rations then in effect by using 310,000 cu. m of concrete in the construction efforts.