Formerly Sears Tower, the Willis Tower is the 5^th 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.

Compare Willis Tower and Aon Center, both of Chicago.

Compare Willis Tower of Chicago and Renaissance Tower of Dallas

Compare Willis Tower of Chicago with the Empire State Building of New York City