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77 West Wacker Drive, also known as the United Building, is an office building in Chicago. Finished in 1992, the building rises to a height of 668 ft (204 m) with around 944,000 square feet (87,700 m) of interior space. The building, with 51 floors, was designed by Ricardo Bofill. It was formerly known as the RR Donnelley Building when the RR Donnelley printing company was the primary tenant.