Ryugyong Hotel vs Aon Center

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The Ryugyong Hotel (Korean: ????; sometimes called Ryu-Gyong Hotel), or Yu-Kyung Hotel, is an unfinished 105-story, 330-metre-tall (1,080 ft) pyramid-shaped skyscraper in Pyongyang, North Korea. Its name ('funds of willows') is also one of the historic names for Pyongyang. The building is also known as the 105 Building, a reference to its number of floors. The building was planned as a mixed-use development, which would include a hotel. The building is currently listed by Guinness World Records as being the tallest unoccupied building in the world.Construction began in 1987 but was stopped in 1992 as North Korea entered a period of financial crisis after the dissolution of the Soviet Union.

After 1992, the building stood topped out, but without any windows or interior fittings. In 2008, construction resumed, and the exterior was completed in 2011. It had been intended to open the hotel in 2012, the centenary of Kim Il-sung's birth. A partial opening was announced for 2013, but this was cancelled. In 2018, an LED screen was fitted to a side, which was used to show animation and movie scenes.

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