Jeddah Tower vs Zifeng Tower

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Jeddah Tower (Arabic: ??? ????), previously called Kingdom Tower (??? ???????), is a stalled construction project of a skyscraper on the north of Jeddah, Saudi Arabia. It is supposed to be the world's first 1 km (3,281 feet ) high building, and the centrepiece and first phase of a development and tourist attraction called Jeddah Economic City.There was steady progress but in January 2018 building owner JEC halted structural concrete work together with the tower about one-third completed because of labour issues with a builder after the 2017--19 Saudi Arabian purge.

JEC has said they plan to restart construction in 2020. The design, created by American architect Adrian Smith, who also designed the Burj Khalifa, incorporates many unique structural and aesthetic features. The founder and leader of the project is Saudi Arabian prince Al-Waleed bin Talal, a grandson of Ibn Saud, and nephew of the Kings of Saudi Arabia before him. Al-Waleed is the chairman of Kingdom Holding Company (KHC), which is a partner in the Jeddah Economic Company (JEC), which was formed in 2009 for the development of Jeddah Tower and City.

Source: Wikipedia

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Zifeng Tower (Greenland Center-Zifeng Tower or Greenland Square Zifeng Tower, previously Nanjing Greenland Financial Center) is a 450-meter (1,480 feet ) supertall skyscraper (special class of skyscraper) in Nanjing, Jiangsu. The 89-story building finished in 2010 includes office and retail space up to floor 41. Floors 49-71 feature a hotel, a lot of restaurants, and a public observatory on the 72 floor. The tower's stepping is practical, helping to separate those sections. The building is currently the tallest in Nanjing and Jiangsu province, the eleventh tallest in China and the twentieth tallest on earth. Architectural firm Skidmore, Owings and Merrill designed the building, headed by Adrian Smith. The Tower occupies an area of 18,721 square meters. The Nanjing Greenland InterContinental Hotel is located within the tower.

Source: Wikipedia