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Originally called the Standard Oil Building, or "Big Stan" to locals, The Aon Insurance Center is ranked the third tallest building in Chicago, measuring a total 1,136 feet (83 stories) high. Designed by Edward Durrell Stone and completed in 1973, the structure cost $120 million and was the fourth-tallest building in the world at the time.
The exterior was originally clad in white Carrara marble, which didn't stand up well to Chicago's notoriously harsh weather. For approximately $80 million dollars, over the course of two years, the building was re-faced with granite that made the facade more durable and stable.
It may be easy to gloss over the Aon when thinking of the best buildings in Chicago. That's partially because the best way to view it is to get up close and personal. There's a sunken plaza in front of the building where you can get close and look at it straight up.