Correction for the size of The Pentagon
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How big is 590 square perches?
It's about one-tenth as big as The Pentagon
The size of The Pentagon is about 5,460 square perches.
(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 5,460 square perches. 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.