Which is the tallest office building in Chicago? That honor goes to the Willis Tower (formerly Sears Tower) which stands at 442 meters.
Formerly Sears Tower, the Willis Tower is the 5th largest office building in the world, with a floor area of 416,000m2 across 108 floors. The tower is also the second tallest building in the Americas at height of 442 meters (1450 feet).
Built in 1974, the Willis Tower is located in the city of Chicago, Illinois, USA.
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