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Aon Center

Photo ID required for entry


200 E. Randolph St.
Use south entrance




Sat, Oct 15: 9am - 5pm

Sun, Oct 16: 9am - 5pm

Photography Permitted Long Lines Wheelchair Accessible


Edward Durell Stone, 1972



The third tallest building in Chicago was originally known as the Standard Oil Building and later the Amoco Building. At 83 floors, it was the tallest in the city and the fourth tallest in the world upon completion—until the Sears Tower (now Willis Tower) opened a year later. The exterior was originally clad in thin slabs of Carrara marble that proved to be unfit for winter weather. As a result, a massive project to re-clad the entire building in granite took place from 1990 to 1992.

Behind the Scenes

Visit the 71st floor and take in 360-degree views from Chicago's third tallest building—the highest site in OHC. All visitors are required to show a valid photo ID.

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This property is managed by JLL