77 West Wacker Drive
77 West Wacker Drive, previously the United Building, is an office building in the Loop, Chicago. 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. The building, with 50 floors, was designed by Ricardo Bofill. It was formerly known as the RR Donnelley Building when RR Donnelley was the primary tenant. RR Donnelley moved its corporate headquarters to a different location in May 2005, and in 2007 the building became the corporate headquarters of United Airlines. The deal included naming rights to the building.The building was the world headquarters of Chicago-based United Airlines and its parent company, United Continental Holdings. It also served as the headquarters for United Continental subsidiary Continental Airlines until its certificate was merged with United on November 30, 2011. In 2012, United moved its headquarters to the Willis Tower, where the company occupies around 20 floors.Archer Daniels Midland moved its headquarters to the building in August 2014 from Decatur, Illinois. The building has a newsletter called "FOCUS", published by Prime Group Realty Trust.