875 North Michigan Avenue

875 North Michigan Avenue
Chicago IL United States

Construction Dates
Floor Count100
Basement Floors1
Units / Rooms703
Building Uses
 - mixed use
 - communication
 - observation
 - office
 - parking garage
 - residential
Structural Types
 - highrise
 - cross brace

 Heights ValueSource / Comments 
Antenna1500 ftFCC Reg. # 1009012
East antenna
Lower antenna1476 ftCTBUH
West antenna
Roof1128 ftCTBUH
Lower roof1107 ftBlueprint in lobby
Top floor1078 ftBlueprint in lobby
Observation deck1030 ftBlueprint in lobby
Ground level0 ft
Sea level-593 ftFCC Reg. # 1009012
Switch heights to

Architect: Skidmore, Owings & Merrill LLP - som.com

• Jerry Wolman Associates
• John Hancock Mutual Life Insurance Co.

• 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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