Kingdom Centre vs Zifeng Tower

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Kingdom Centre (Arabic: ???? ????????) is a 99-story, 302.3 m (992 ft) skyscraper in Riyadh, Saudi Arabia. When completed in 2002, it overtook the 267-meter Faisaliyah Tower as the tallest tower in Saudi Arabia. It has since been surpassed and has become the fifth-tallest skyscraper in the nation, whose tallest two buildings are the Abraj Al Bait Towers and the Capital Market Authority Tower. It is the world's third-tallest building with a hole following the Shanghai World Financial Center and the 85 Sky Tower in Taiwan. The mixed-use tower was created by Prince Al-Waleed bin Talal and designed by the group of Ellerbe Becket and Omrania, who were selected through an international design competition.

It is situated on a 100,000--square-metre website and houses the 57,000-square-meter Al-Mamlaka shopping mall, offices, the Four Seasons Hotel Riyadh, and luxury apartments. There is a 65m skybridge atop the skyscraper.The upper third of the tower features an inverted parabolic arch topped by a public sky bridge. The sky bridge is a 300-ton steel construction, taking the kind of an enclosed corridor with windows on either side. After paying the entrance fees, visitors take two elevators to reach that level.

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