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635,000 kilograms is about one-three-hundredth as heavy as The Sears Tower
In other words, it's 0.003147 times the weight of The Sears Tower, and the weight of The Sears Tower is 317.80 times that amount.
(officially "Willis Tower" as of 2009) (Chicago, Illinois)
The Willis Tower weighs approximately 201,800,000 kilograms. 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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