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Chicago

77 West Wacker Drive

This office building located in the Loop is also known as the United Building. Formerly known as the RR Donnelley Building, it rises to a height of 668-feet with 51-floors providing around 944,000 square feet of interior space. Designed by Ricardo Bofill and constructed in 1992, this building which is housing Microsoft occupying multiple floors is also the world headquarters of United Airlines.