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250 kilograms is about one-eight-hundred-thousandth as heavy as The Sears Tower
In other words, it's 0.000001239 times the weight of The Sears Tower, and the weight of The Sears Tower is 807,100 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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