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Presidential Towers

One of the 4 Presidential Towers. Managed by Waterton Associates LLC, the Presidential Towers are a residential complex comprised of 4 identical towers completed in 1985.

AON Center Facts

- the exact address of the center is 200 E Randolph St, Chicago, IL 60601;

- it has 83 floors and a height of 1,136 feet (346 m);

- the center was completed in 1973; at that time its name was Standard Oil Building and it belonged to the Standard Oil Company of Indiana later known as AMOCO and now part of BP;

- at the time of completion it was the tallest building in Chicago, surpassed a year later by the Sears Tower and in 2008 by the Trump Tower;

- also, when completed it was the world’s tallest marble-clad building (covered by 43,000 slabs of marble – Italian Carrara);

- when the Standard Oil Company of Indiana changed its name to AMOCO in 1985, the center was renamed the Amoco Building;

- The Blackstone Group bought it in 1998 and changed its name to AON Center in 1999; however, the AON Corporation would become the building’s primary tenant only in 2001;

- due to the fact that the marble used to sheath the building was thinner than what was previously used in the industry, in 1974, just a year after completion, one of the slabs detached and penetrated the roof of the nearby Prudential Center; from 1990 till 1992 the entire building was refaced at an estimated cost of over $80 million (well over half of the original cost of the entire building).

Chicago Mercantile Exchange Building

The Chicago Mercantile Exchange Building. The Mercantile Exchange moved here in 1985.