Correction for the height of The Willis Tower
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How long is 2,200 spans?
It's about as tall as The Willis Tower
The height of The Willis Tower is about 2,270 spans.
(a.k.a. Sears Tower) (Chicago, Illinois) (to antenna peak)
The Willis Tower rises to about 2,270 spans to the top of its tallest antenna. The bathrooms on the 103rd floor are said to be the highest in the western hemisphere at about 1,800 spans.