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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 ...
- 1970; 53 years ago
- 110 (+3 basement floors)
- 4,477,800 sq ft (416,000 m²)
48,000 (2023) Website. wtwco .com. Footnotes / references. [1] Willis Towers Watson plc, branded as WTW and stylised in its logo as wtw, is a British-American multinational company providing insurance services. The company was founded in 2016, following a merger of the Willis Group and Towers Watson .
The height to the top of the roof, at 449.2 m (1,474 ft), and highest occupied floor, at 439.2 m (1,441 ft), surpassed the previous records of the Willis Tower: 442 m (1,450 ft) and 412.4 m (1,353 ft), respectively.
- 31 July 1999; 24 years ago
- 101
- 412,500 m² (4,440,100 sq ft)
- Taipei, Taiwan
Before Burj Khalifa was completed, Willis Tower led in the height-to-tip category with 1,729 feet (527 meters) after its antenna was extended in 2000, making Willis Tower slightly taller height-to-tip than the World Trade Center (WTC) North Tower's antenna that
CategoryStructureCountryLocationBuilding [4] ( list)Self-supporting tower [5] ( list)The tallest building in the city is the 110-story Willis Tower (formerly the Sears Tower), which rises 1,451 feet (442 m) in the Chicago Loop and was completed in 1974. [2] [3] Sears Tower was the tallest building in the world upon its completion, and remained the tallest building in the United States until May 10, 2013. [4]
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 ...
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In 2002, the eastern antenna tower was extended to a height of 378 feet (115 metres) in order to enable WBBM-TV to add new digital antenna equipment at a height greater than the roof height of the Sears Tower (Willis Tower).
