Review of the construction facts of 875 North Michigan Avenue (John Hancock Center) in Chicago, IL, USA.<br /><br />Technical data:<br /><br />Height (tip): 456.90m / 1,499ft<br />Height (architectural): 343.69m / 1,128ft<br />Height (roof): 343.69m / 1,128ft<br />Height (top floor): 321.31m / 1,054ft<br />Height (observation floor): 313.81m / 1,030ft<br />Height (observation deck): 313.81m / 1,030ft<br />Height (floor-ceiling): 2.64m / 8.66ft<br />Length: 80.77m / 256ft<br />Width: 50.29m / 165ft<br />Floors (above ground): 100<br />Construction start: June 1965<br />Construction end: 1969<br />Elevators: 50<br />Parking places: 750<br />Building costs: $95,000,000