Canton Tower vs Aon Center

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The Canton Tower (Chinese: ???), officially Guangzhou TV Astronomical and Sightseeing Tower (Chinese: ???????????), is a 604-meter (1,982 feet )-tall multipurpose monitoring tower in the Haizhu District of Guangzhou (alternatively romanized as Canton). The tower was topped out in 2009 and it became operational on 29 September 2010 for the 2010 Asian Games.

The tower briefly held the title of tallest tower in the world, replacing the CN Tower, before being surpassed by the Tokyo Skytree. It was the tallest structure in China prior to the topping out of the Shanghai Tower on 3 August 2013, and is now the second tallest tower and the fourth-tallest freestanding structure in the world.

Source: Wikipedia

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The Aon Center (200 East Randolph Street, formerly Amoco Building) is a modern supertall skyscraper just east of the Chicago Loop, Chicago, Illinois, United States, designed by architect Companies 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 ft (346 m), it's the fourth-tallest construction in Chicago, surpassed in height by Willis Tower, Trump International Hotel and Tower, and Vista Tower. The building is managed by Jones Lang LaSalle, which is also headquartered in the building. Aon Center formerly housed the world headquarters of Aon and Amoco. Aon still maintains headquarters of its US operations there. The building is also the co-headquarters of Kraft Heinz.

Source: Wikipedia