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701.120 square perches is about one-tenth as big as The Pentagon.
In other words, it's 0.1290 times the size of The Pentagon, and the size of The Pentagon is 7.750 times that amount.
(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.
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