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1,900,000 tons is about eight-and-a-half times as heavy as The Sears Tower
In other words, it's 8.5410 times the weight of The Sears Tower, and the weight of The Sears Tower is 0.11710 times that amount.
(officially "Willis Tower" as of 2009) (Chicago, Illinois)
The Willis Tower weighs approximately 222,400 tons. 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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