History: The John Hancock Center at 875 N. Michigan Ave. in Chicago, Illinois is a one-hundred-story, 1,127 ft. (344 m)-tall skyscraper designed by structural engineer Fazlur Khan of Skidmore, Owings and Merrill and, when completed in 1969, was the tallest building in the world outside of New York City. It is the third tallest skyscraper in Chicago and the fourth tallest in the United States, after the Sears Tower, the Empire State Building and the Aon Center. The building is home to offices and restaurants, as well as more than 700 condominiums and contains the highest residences in the world. The first residential lease for the Hancock building was signed by Benjamin Gingiss who lived in the building until his death.