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Is 40,000 tonnes as heavy as The Sears Tower?

It's about one-fifth as heavy as The Sears Tower
Flag of The US
The weight of The Sears Tower is about 201,800 tonnes.
(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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