Aon Center (Chicago) Aon Center (Chicago) The Aon Center (200 East Randolph Street, formerly Amoco Building) is a modern supertall skyscraper in the Chicago Loop, Chicago, Illinois, United States, designed by architect firms Edward Durell Stone and The Perkins and Will partnership, and completed in 1974 as the Standard Oil Building. With 83 floors and a height of 1,136 feet (346 m), it is the third tallest building in Chicago, surpassed in height by the Willis Tower, and the Trump International Hotel and Tower. The building is managed by Jones Lang LaSalle, which is also headquartered in the building. Aon Center formerly had
Tribune Tower Tribune Tower The Tribune Tower is a neo-Gothic skyscraper located at 435 North Michigan Avenue in Chicago, Illinois, United States. It was the home of the "Chicago Tribune", Tribune Media, and tronc, Inc., formerly known as Tribune Publishing. WGN Radio (720 kHz) originated broadcasts from the building until moving to 303 Wacker Drive in June, 2018. The last WGN Radio broadcast emanated from the Tribune Tower on June 18, 2018. The ground level houses the large restaurant Howells & Hood (named for the building's architects), whose patio overlooks nearby Pioneer Court and Michigan Avenue. CNN's Chicago bureau was also located