The third tallest skyscraper in Chicago, the 1,136 foot 1972 completed Aon Center is the home of the 287th largest company in America, the insurance giant, Aon Corporation.
Originally called the Standard Oil Building, it was later renamed Amoco Building in 1985, before being rechristened the Aon Center in 1999. The simple but deeply striking design has been both lauded and criticized by skyscraper enthusiasts the world over.
The Skyline of Chicago was forever altered in the late 60’s and early 1970’s when The John Hancock Center (1969), The Bank One Tower ( Chase Tower ,1969) The Standard Oil Building (Aon, 1972), The Sears Tower (Willis, 1974) and The Water Tower Place (1976) were put up in rapid succession. All of these structures were over 850 feet tall. Thereby transforming the city into the view we see today, other high rises would follow but arguably these buildings did the most to turn the city of Chicago into a skyscraper mecca.