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0.00273 megatonnes is about one-seventy-fifth as heavy as The Sears Tower
In other words, it's 0.01353 times the weight of The Sears Tower, and the weight of The Sears Tower is 73.910 times that amount.
(officially "Willis Tower" as of 2009) (Chicago, Illinois)
The Willis Tower weighs approximately 0.20180 megatonnes. The outer wall surface of the Tower is covered with black anodized aluminum panels which would total 110,000 sq. m (28 acres) if laid out together.
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