The Willis Tower is a 110-story, 1,451-feet or 1,729 feet to the top of antenna 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, it was completed in 1974 as the world's tallest building, a title that it held for nearly 25 years.
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