77 West Wacker Drive,[1] previously the United Building, is an office building in the Chicago Loop. It was finished in 1992. The building rises to a height of 668 ft (204 m) with around 944,000 square feet (87,700 m2) of interior space.[2] The building, with 51 floors, was designed by Ricardo Bofill.[3] It was formerly known as the RR Donnelley Building. In 2007, the building became the corporate headquarters of United Airlines.
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