Burj Al Arab vs Aon Center

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The Burj Al Arab (Arabic: ??? ?????, Tower of the Arabs) is a five star hotel located in the city of Dubai, United Arab Emirates. Managed by Jumeirah hotel group, it is one of the tallest hotels in the world, although 39 percent of its total height consists of non-occupiable space. Burj Al Arab stands on an artificial island 280 m (920 ft) from Jumeirah Beach and is joined to the mainland by a personal curving bridge.

The form of the structure is designed to resemble the sail of a boat. It has a helipad near the roof at a height of 210 m (689 ft) above ground.

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