The Aon Center (200 East Randolph Street, formerly Amoco Building)[2] is a modern skyscraper in the Chicago Loop, Chicago, Illinois, United States, designed by architect firms Edward Durell Stone and The Perkins and Will partnership, and completed in 1974[3] as the Standard Oil Building.[4] With 83 floors and a height of 1,136 feet (346 m), it is the third tallest building in Chicago.

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