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John Hancock Center
875 North Michigan Avenue
Chicago IL United States
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| Status: | built | | Construction Dates | | Began | 1965 | | Finished | 1969 | | Floor Count | 100 | | Floor Area | 260,126 m² | | Elevator Count | 50 |
|  | | Building Uses | | - mixed use | | - communication | | - observation | | - office | | - residential | | Structural Types | | - highrise | | - cross brace | | Architectural Style | | - international | | Materials | | - glass | | - steel |
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| | Heights | | Value | | Source / Comments | | | | Antenna | | 457.2 m | | FCC Reg. # 1009012 | | | East antenna | | | | | Lower antenna | | 450.0 m | | CTBUH | | | West antenna | | | | | Roof | | 343.5 m | | CTBUH | | | | | | | | Lower roof | | 337.3 m | | Blueprint in lobby | | | | | | | | Top floor | | 328.6 m | | Blueprint in lobby | | | | | | | | Observation deck | | 313.8 m | | Blueprint in lobby | | | | | | | | Ground level | | 0.0 m | | | | | | | | | | Sea level | | -180.7 m | | FCC Reg. # 1009012 | | | | | |
Description
- This project was intended to be developed as several smaller buildings having different functions but within the same parcel. The project developer wanted a 50 storey office tower (1 million sq.ft.) along with a 70 storey residential complex (also 1 million sq.ft.) and 800,00 sq.ft. of combined commercial space and parking. The plan put forth by the S.O.M. Architect-Engineer team of Bruce Graham & Fazlur Khan called for stacking all of this components into a single 100 storey tower of comparable square footage. The structural system (a braced tube) was made possible by new and emerging computer analysis techniques. The tapered shape allows for smaller residential plates over office plates over commercial plates and opens up a wider environment at the plaza.
- The observation deck is unusual in that part of it has a screen window instead of the standard plate glass.
- Building topped-out 6 May 1968.
- The base of the building has dimensions of 80.77 by 50.29 meters (north-south by east-west). The building narrows towards the top at 32 by 19.8 meters.
- Member of "World Federation of Great Towers".
- In 1969, it was the 2nd tallest building in the world.
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