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40,000 tonnes is about one-fifth as heavy as The Sears Tower.
In other words, it's 0.19820 times the weight of The Sears Tower, and the weight of The Sears Tower is 5.045 times that amount.
(officially "Willis Tower" as of 2009) (Chicago, Illinois)
The Willis Tower weighs approximately 201,800 tonnes. 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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