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4.890 ounces is about 0.0000000007 times as heavy as The Sears Tower.
In other words, it's 0.0000000006870 times the weight of The Sears Tower, and the weight of The Sears Tower is 1,456,000,000 times that amount.
(officially "Willis Tower" as of 2009) (Chicago, Illinois)
The Willis Tower weighs approximately 7,118,000,000 ounces. 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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