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Identification Name Aon Center Alternative name Amoco Building, Standard Oil Building Emporis Building ID 116756
Location
Address as text * ZIP * Zone Neighborhood District City State Country
Map and Surrounding Area
Technical Data Height (architectural) 346.26 m Height (roof) * Length * Width * Floors (above ground) 83 Floors (underground) * Construction start * Construction end * Gross floor area * Usable floor area * Floor-to-floor height * Parking places *
Structure in General Construction type skyscraper Current status  existing [completed] Structural system framed tube Structural material steel Facade material granite Facade system curtain wall Architectural style modernism
Usages Main usages  commercial office Side usages  restaurant  shop(s)
Features and Amenities
Doorman is available One of the city's famous buildings Pedway access is available Plaza is available to the public
Facts
This was the tallest building in Chicago from 1973 until 1974, when it was surpassed by the Willis Tower. |
Aon Center is the only regular "box-shaped" building in the world over 300 meters tall. |
Until the Shanghai World Financial Center was topped out in 2007, this was the tallest building in the world without any major antennae, spires, or finials at the top. In July 2009 a small communications antenna was installed on the roof. |
Until 2009 this was the tallest building in the United States ever to change its name. It was originally called the Standard Oil Building (nicknamed "Big Stan"), and later the Amoco Building. |
A "Sounding Sculpture" by Harry Bertoia is split between the east and west plazas. Its metal rods make soft music in the wind. The sculpture was originally a single ensemble in front of the building. |
From 1990 to 1992 the building's 43,000 marble cladding panels were replaced by two-inch-thick Mt. Airy granite panels at a cost of about $80 million. |
A sunken plaza leads to the main entrance off East Randolph Street. Before a postmodernization in the 1990's the plaza was a secluded space with two groves of locust trees flanking a reflecting pool with the Bertoia sculpture. |
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During the groundbreaking ceremony on April 6, 1970, a helicopter hovered 1,136 feet (346 m) over the site to demonstrate how tall the building would be. |
Each side of the building has 15 vertical bands of black windows, recessed between triangular white piers. |
The Standard Oil Company built this tower to replace its old headquarters on South Michigan Avenue, now known as the Michigan Avenue Lofts. |
Marble removed from the cladding of the building was crushed and used as decorative stone surrounding the Amoco refinery in  Whiting, Indiana. The project was referred to as the "Whiting Beautification Project". |
Companies involved in this building
Other companies:
Turner Construction Company, Edward Durell Stone & Associates, Perkins & Will, Otis Elevator Co., Perkins & Will, STS, Wells Real Estate Investment Trust, Inc., Jacobs/Ryan Associates, Standard Oil Company of Indiana, Commercial Light Company, Rowan Williams Davies & Irwin Inc., Wiss, Janney, Elstner Associates, Inc. (WJE), Standard Oil Company of Indiana, Sager Sealant Corporation, American Bridge Company, U.S. Steel Corporation, Midland Engineering |
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