![]() ![]() The building is home to several offices and restaurants, as well as about 700 condominiums. When measured to the top of its antenna masts, it stands at 1,500 feet (457 m). ![]() It is currently the fourth-tallest building in Chicago and the ninth-tallest in the United States, after One World Trade Center, the Willis Tower, 432 Park Avenue, the Trump Tower Chicago, the Empire State Building, the Bank of America Tower, 30 Hudson Yards and the Aon Center. When the building topped out on May 6, 1968, it was the second-tallest building in the world and the tallest outside New York City. It was constructed under the supervision of Skidmore, Owings and Merrill, with chief designer Bruce Graham and structural engineer Fazlur Khan. The tower’s tapered shape was chosen in order to match the different floor space requirements that decrease from bottom to top - from the entrance and commercial zones at the base to the clusters of small apartments at medium height and finally to the large apartments on top, where relatively less space is needed for ancillary rooms with artificial lighting.875 North Michigan Avenue (additional entrances at 175 East Delaware Place and 170 East Chestnut Street)Ĥ1★3′56″N 87☃7′23″W / 41.8988°N 87.6230°W Coordinates: 41★3′56″N 87☃7′23″W / 41.8988°N 87.6230°W It was therefore decided to construct a single tower where the offices would be on the lower floors and the apartments on the higher levels. ![]() Moreover, the lower-level apartments would have suffered from noise nuisance from the street. But the two towers would have occupied most of the site and would have impaired each other’s privacy and daylight conditions. The wish to continue this mixture initially gave rise to the idea of building a 70-story apartment tower and a 45-story office tower. Known locally as “Big John,” the tower is situated on North Michigan Avenue in a prestigious district with apartments, shops, offices, hotels, restaurants, and art galleries. ![]()
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