description Aon Center Overview
Aon Center is an 83-story office skyscraper at 200 Randolph Street in Chicago's Loop, completed in 1973. Designed by architect Edward Durell Stone, it rises about 346 meters and was one of Chicago's tallest buildings when it opened. Its original exterior used white Carrara marble panels on the columns, but cracking and bowing led to a major facade replacement with granite. The building remains a prominent part of Chicago's modern skyline.
help Aon Center FAQ
Where is the Aon Center in Chicago?
The Aon Center stands at 200 East Randolph Street in Chicago's Loop. It occupies the eastern edge of the downtown business district near Grant Park.
How tall is the Aon Center?
The Aon Center is about 346 metres tall and has 83 storeys. When it opened in 1973, it was the second-tallest building in Chicago.
Why was the Aon Center originally called the Standard Oil Building?
The tower was commissioned as the headquarters of Standard Oil of Indiana and opened under the name Standard Oil Building. It later became the Amoco Building before being renamed Aon Center in 1998.
Why was the Aon Center's exterior changed?
The original exterior used approximately 43,000 slabs of white Carrara marble, but the thin cladding developed cracks and bowing. During the early 1990s, the marble was replaced with more durable granite.
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