Formerly known as the Sears Tower, the 108-story Willis Tower was designed by Bruce Graham and Fazlur Khan of Skidmore, Owings and Merrill in 1973. Shutterstock Though Chicago’s Willis Tower hasn’t ...
This is the most common way to measure a building. The architectural top of a building includes any building structure or ornaments, like spires or parapets, but it does not include what the CTBUH ...
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