The Sears Tower is a skyscraper in Chicago, Illinois, and the tallest building in the United States. Commissioned by Sears, Roebuck and Company, it was designed by chief architect Bruce Graham and structural engineer Fazlur Khan of Skidmore, Owings, & Merrill.
Construction commenced in August 1970 and the building reached its maximum height on May 3, 1973. When completed, the Sears Tower had overtaken the twin towers of the World Trade Center in New York City as the world's tallest building. The tower has 108 stories (the building owners claim 110, but this includes the main roof and the roof of the elevator penthouse). The distance to the upper roof is 1,450 feet, 7 inches (442 m), measured from the east entrance. In February 1982, two television antennas were added to the structure, bringing its total height to 1,707 feet (520 m). The western antenna was later extended to 1,729 feet (527 m) on June 5, 2000 to improve reception of local NBC station WMAQ-TV. In the process it surpassed the height of the antenna on 1 World Trade Center.
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