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538 yards is about nine-tenths as tall as The Sears Tower.
In other words, it's 0.9330 times the height of The Sears Tower, and the height of The Sears Tower is 1.07 times that amount.
(a.k.a. Willis Tower) (Chicago, Illinois) (to antenna peak)
The Willis Tower rises to 576 yards to the top of its tallest antenna. The bathrooms on the 103rd floor are said to be the highest in the western hemisphere at 451 yards.
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