Aon Center

The Aon Center (200 East Randolph Street) is a modern skyscraper in Chicago designed by architect Edward Durell Stone and completed in 1973 as the Standard Oil Building. With 83 floors and a height of 346 m (1,136 ft), it is the second tallest building in Chicago, surpassed in height only by the Sears Tower. It is the third tallest in the United States behind the Empire State Building and the 15th tallest in the world. The building is managed by Jones Lang LaSalle.