One South Dearborn is a 571 ft (174m) tall skyscraper in Chicago, Illinois. An earlier proposal for the same site proposed a much taller 112-story building. The current anchor tenant is Sidley Austin LLP, which moved into One South Dearborn in November 2005 from Bank One Plaza.

• List of tallest buildings in Chicago

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• Emporis
• Skyscraperpage

• Official website