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Willis Tower height: 1,451 feet high with 110 stories; Number of Willis Tower floors: The tower's main roof is considered as the 109 th floor, with the mechanical penthouse roof considered as the 110 th floor. It is the 12 th tallest building in the world. The tower spans over 4.3 million square feet and features a remarkable 16,100 windows.
Mar 6, 2024 · Willis Tower, skyscraper office building in Chicago, Illinois, located at 233 South Wacker Drive, that is one of the world’s tallest buildings. The Sears Tower opened to tenants in 1973, though construction was not actually completed until 1974.
Formerly known as the Sears Tower, Willis Tower has been an iconic part of the Chicago skyline since 1973. At 110 stories high, Willis Tower is also one of the largest skyscrapers in the world. In 2017, Willis Tower underwent a massive transformation to be reimagined for the future of work.
For nearly 25 years after its completion, the Willis Tower, formerly known as the Sears Tower, held the title of tallest building in the world. Standing 110 stories tall, its black aluminum and bronze-tinted glass exterior has become emblematic of Chicago, a city crazy about its architecture.
Explore Chicago like never before with Skydeck Chicago. Offering spectacular views spanning up to four states, a one-stop Chicago experience full of interactive exhibits and the Willis Tower glass ledge. Visit Skydeck Chicago today!
Willis Tower, formerly (1973–2009) Sears Tower, Skyscraper office building in Chicago. With 110 floors and a height of 1,450 ft (442 m), it became the world’s tallest building at its completion in 1974. Its architect, Fazlur Khan (1928–1982), designed it as a bundled-tube ( see skyscraper) structure to resist lateral forces.
The Willis Tower, originally 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.
