Turning Torso vs Aon Center

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Turning Torso is a neo-futurist residential skyscraper in Sweden and the tallest building in Scandinavia.Located in Malmö on the Swedish side of the Öresund strait, it was built and is owned by Swedish cooperative association HSB. It's seen as the first twisted skyscraper in the world.The project was designed by Spanish architect, structural engineer, sculptor and painter Santiago Calatrava and formally opened on 27 August 2005.

The tower reaches a height of 190 metres (623 feet ) with 54 storeys and 147 apartments.In August 2015, it was announced that the building was the winner of the 10 Year Award from the Council on Tall Buildings and Urban Habitat. It won the 2005 Gold Emporis Skyscraper Award.

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