Willis Tower (Sears Tower)
233 South Wacker Drive
Chicago, Cook County, Illinois, 60606
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The Willis Tower, built as and still commonly referred to as Sears Tower, is a 108-story, 1,451-foot (442 m) skyscraper. At completion in 1973, it was the tallest building in the world, a title it held for nearly 25 years. from 1973 to 1998.
In February 1982, two television antennas were added to the structure, increasing its total height to 1,707 ft. (520 m). The western antenna was extended to 1,729 ft. (527 m) on June 5, 2000.
The Sears Tower has the most total floor space of any building in the United States only behind The Pentagon.
Two-story high black bands appear on the tower around the 30th-32nd, 64th-65th, 88th-89th, and 106th-107th floors. These are louvers which allow ventilation for service equipment and obscure the structure's belt trusses which Sears Roebuck did not want to be visible.
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Originally named the Sears Tower, the structure was renamed in 2009 by the Willis Group, as part of its lease on a portion of the tower's space.
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The Willis Tower is the second-tallest building in the United States and the 12th-tallest in the world.
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The Willis Tower is the second-tallest building in the United States. More than one million people visit its observation deck each year, making it one of Chicago's most popular tourist destinations.
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