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The Willis Tower, originally and still commonly referred to as the Sears Tower, is a 110-story, 1,451-foot (442.3 m) skyscraper in the Loop community area of Chicago in Illinois, United States. Designed by architect Bruce Graham and engineer Fazlur Rahman Khan of Skidmore, Owings & Merrill (SOM), it opened in 1973 as the world's tallest ...
Here’s some background information about Willis Tower, formerly the Sears Tower, located in Chicago. Facts. The Sears Tower was the world’s tallest building until 1996, when it was surpassed ...
He was the designer of the Sears Tower, since renamed Willis Tower, the tallest building in the world from 1973 until 1998, and the 100-story John Hancock Center. A partner in the firm Skidmore, Owings & Merrill in Chicago, Khan, more than any other individual, ushered in a renaissance in skyscraper construction during the second half of the ...
At the time, the Willis Tower held first place in the second and third categories, the Petronas Towers held the first category, and the original WTC North Tower held the fourth (height to tip) category with its antenna. [19] In 2000, however, a new antenna mast was placed on the Willis Tower, giving it the record in the fourth category.
Using the criterion of highest tip (including antennae), the World Trade Center in New York City was the world's tallest building from 1971 to 1973, until the Willis Tower in Chicago (which already had a higher occupied floor than the World Trade Center) had its antenna extended to give that building the world's tallest tip a title it held ...
(The highest point is the Willis Tower, formerly known as the Sears Tower.) The top of the hill is about 0.25 miles (400 m) from the Wisconsin border. It is within the Driftless Area, a region of Illinois, Iowa, Minnesota, and Wisconsin that was not covered or ground down by the last continental glaciers. The hill itself is an erosional remnant ...
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Willis secured the naming rights effective July 2009 as part of its agreement to lease 140,000 square feet (13,000 m 2) of space in the 3,800,000-square-foot (350,000 m 2) tower. [29] It is the tallest building in the U.S. and was the tallest building in the world from 1974 until 1998, when it was surpassed by the Petronas Towers in Kuala ...