Willis Tower | Height & Facts | Britannica
https://www.britannica.com/topic/Willis-Tower
WEBMar 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.
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