By Edward Durell Stone, built 1973, modern architecture.
The Aon Center is a modern supertall skyscraper located in the Northeast corner of the Chicago Loop, Chicago, Illinois, United States. It was designed by a partnership between architecture firms Edward Durell Stone and Perkins and Will and was completed in 1973 as the Standard Oil Building. With 83 floors and a height of 1,136 feet (346 m), it is the fourth-tallest building in Chicago, surpassed in height by the Willis Tower, Trump International Hotel and Tower, and St. Regis Chicago.
From Wikipedia, CC BY-SA 4.0.
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