With an endorsement from the Chicago City Planning Commission last week, Santiago Calatrava's 2,000 ft. "Chicago Spire" has come one step closer to reality. The building would become North America's tallest skyscraper, surpassing its next tallest rival, Chicago's Sears Tower, by 550 feet. The Spire's plan includes 150 stories, each of which would rotate two degrees from the one below it , to a total rotation of 360 degrees.
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