Aon Center (Chicago)

Aon Center (Chicago)

Infobox Skyscraper

building_name=Aon Center
location=200 East Randolph Street Chicago, Illinois
floor_count=83 aboveground 5 belowground
roof= 1,136 ft (346 m)
floor_area=3,600,000 sq. ft. 334,448 m²
cost=$120,000,000 (USD)
architect=Edward Durell Stone
contractor=Turner Construction
developer=Standard Oil of Indiana

The Aon Center (200 East Randolph Street, formerly Amoco Building) [cite web|url=|title=New owner expected for Aon Center|accessdate=2008-09-18|date=2003-02-21|publisher=Newsbank|work=Chicago Sun-Times|author=Roeder, David] is a modern skyscraper in Chicago designed by architect firms Edward Durell Stone and The Perkins and Will partnership, and completed in 1973 as the Standard Oil Building.Citation
author = Emporis
title = Aon Center, Chicago
url =
accessdate = 2008-04-23
] With 83 floors and a height of 1,136 feet (346 m), it is the third tallest building in Chicago, surpassed in height by the Sears Tower and the Trump Tower. The building is managed by Jones Lang LaSalle.


The Standard Oil Building was constructed as the new headquarters of the Standard Oil Company of Indiana, which had previously been housed at South Michigan Avenue and East 9th Street. When it was completed in 1973 it was the tallest building in Chicago and the fourth-tallest in the world, earning it the nickname "Big Stan".Citation
author = Glass Steel and Stone
title = Aon Center
url =
accessdate = 2007-09-25
] (A year later, the Sears Tower took the title as Chicago's tallest.) The building employs a tubular steel-framed structural system with V-shaped perimeter columns to resist earthquakes, reduce sway, minimize column bending, and maximize column-free space.

When completed, it was the world's tallest marble-clad building, being sheathed entirely with 43,000 slabs of Italian Carrara marble. This quickly proved to be an unsuitable cladding for the harsh Chicago winters. In 1974, just a year after completion, one of the marble slabs detached from the façade and penetrated the roof of the nearby Prudential Center Annex. To alleviate the problem, stainless steel straps were added to hold the marble in place. Later, from 1990 to 1992, the entire building was refaced with Mount Airy white granite at an estimated cost of over $80 million.Citation
title=Two buildings, two cities, one problem
periodical=The Globe and Mail
] (Amoco was reticent to divulge the actual amount, but it was well over half the original price of the building, without adjustment for inflation.) The discarded marble was crushed and used as landscaping decoration at Amoco's refinery in Whiting, Indiana. Two years after the completion of the Standard Oil Building, First Canadian Place was opened in Toronto, Ontario. Durrell Stone acted as the consulting architect on the project, which ended up being of a very similar design to the project in Chicago; square in plan, 48 meters shorter, and clad in white Italian Carrara marble, the only visible difference being the horizontal orientation of the windows on the Toronto tower, as opposed to the vertical run of the windows on the Standard Oil tower. Echoing the problems with the cladding experienced on the Standard Oil Building, in 2007 a panel of marble fell from the 60th floor of First Canadian Place. [ [ Doolittle, Robyn; "Toronto Star": King St. to stay closed; May 16, 2007] ]

The Standard Oil Building was renamed the Amoco Building when the company changed names in 1985. In 1998, Amoco sold the building to The Blackstone Group for an undisclosed amount, estimated to be between $430 and $440 million. It was renamed as the Aon Center on December 30, 1999, although the Aon Corporation would not become the building's primary tenant until September 2001. [Citation
author = Business Wire
title = ADVISORY/Chicago Landmark Office Tower Officially Renamed Aon Center During Unveiling Ceremony
url =
accessdate = 2007-09-25
] In May 2003, Wells Real Estate Investment Trust, Inc. acquired the building for between $465 and $475 million. [Citation
author = Miller Cicero, LLC
title = Trophy Building Sale Sets New Record
url =
accessdate = 2007-09-25
] (On August 10, 2007, Wells Real Estate Investment Trust, Inc. changed its name to Piedmont Office Realty Trust, Inc.) [Citation
author = Piedmont Office Realty Trust, Inc.
title = Wells REIT Changes Name to Piedmont Office Realty Trust
url =
accessdate = 2007-08-10

Exterior lighting

In the early 1980s, the lights in selected offices in the building were turned on to form a huge cross during the Christmas season.Fact|date=February 2007 In recent years, the top floors of the building have been lit at night with colors to reflect a particular season or holiday. Orange is used for Thanksgiving, green or red for Christmas, and pink during Breast Cancer Awareness Month. The lighting commonly matches the nighttime lighting on the antenna of the Sears Tower and the upper floors of the Merchandise Mart.


In the plaza, there is a Sounding Sculpture by Harry Bertoia.


Aon is the building’s largest tenant, subleasing from BP.Fact|date=September 2007 It leases a rentable 515,083 sq. ft. (47,852 m²), or 20.6% of the building.
*Kirkland & Ellis
*DDB Worldwide
*Element 79
*Jones Lang LaSalle
*Daniel Edelman Inc.
*R.H. Donnelly
*Strata Decision Technology
*Chicagoland Chamber of Commerce
*The Mid-America Club
*Zeno Group

Position in Chicago's skyline

ee also

*List of buildings
*List of skyscrapers
*List of tallest buildings in Chicago
*List of tallest buildings in the United States
*World's tallest structures
*List of tallest freestanding structures in the world


External links

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Look at other dictionaries:

  • Aon Center (Chicago) — Aon Center …   Deutsch Wikipedia

  • Aon Center (Chicago) — Saltar a navegación, búsqueda AON Center El Aon Center (200 East Randolph Street) es un rascacielos ubicado en Chicago, Illinois que fue completado en 1972. Con 346.3 m de altura y 83 plantas, es el segundo edificio más alto de la ciudad después… …   Wikipedia Español

  • Aon Center (Chicago) — Pour les articles homonymes, voir Aon Center. Aon Center Localis …   Wikipédia en Français

  • Aon Center (Los Angeles) — Aon Center …   Deutsch Wikipedia

  • Aon Center — bezeichnet mehrere Bauwerke: Aon Center (Chicago), einen Wolkenkratzer in Chicago Aon Center (Los Angeles), einen Wolkenkratzer in Los Angeles Diese Seite ist eine Begriffsklärung zur Unterscheidung mehrerer m …   Deutsch Wikipedia

  • Aon Center — Saltar a navegación, búsqueda Aon Center es el nombre de dos rascacielos. El Aon Center (Chicago) tiene 83 pisos y 346 metros El Aon Center (Los Angeles) tiene 62 pisos y 262 metros Obtenido de Aon Center Categoría: Wikipedia:Desambiguación …   Wikipedia Español

  • Aon Center — The Aon Center is the name of two buildings.* Aon Center (Chicago) * Aon Center (Los Angeles) …   Wikipedia

  • Aon Center — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. Aon Center est le nom de deux gratte ciel américains: Aon Center (Los Angeles, Californie) Aon Center (Chicago, Illinois) Catégorie : Homonymie …   Wikipédia en Français

  • Citigroup Center (Chicago) — 41° 52′ 55″ N 87° 38′ 26″ W / 41.88200, 87.64049 …   Wikipédia en Français

  • Citigroup Center (Chicago) — For the similarly named skyscraper in New York City, see Citigroup Center. Citigroup Center Citigroup Center General information Type Commercial …   Wikipedia

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