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Aon Center

200 East Randolph Street
Chicago IL United States

Status:built
Construction Dates
  Began1970
  Finished1973
Floor Count83
Basement Floors5
Floor Area334,448 m²
Building Uses
 - office
 - parking garage
 - restaurant
 - retail
Structural Types
 - highrise
Architectural Style
 - international
Materials
 - steel
 - granite

 Heights ValueSource / Comments 
Roof1136 ft
Main roof1123 ft

Description
The original marble cladding of Aon Centre bowed under the temperature swings experienced in the Chicago climate. The cladding was 32mm (1.25") thick Itallian Carrera Marble (similar to what Michaelangelo used), but 20 years after original construction it had severly deteriorated. The marble was replaced with 51mm (2") thick Mt. Airy Granite at a cost of $80M between 1990 and 1992 (43,000 individual 1.27m x 1.14m [50" x 45"] panels). The original construction cost in 1973 was a mere $120M

The building is 59.1 meters wide (194 feet), with 4.6 meter indents (15 feet).

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Companies
Edward Durell Stone & Associates - Architect
  
  

Drawing by R Pierce
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