Zifeng Tower vs Petronas Towers

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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

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The Petronas Towers, also known as the Petronas Twin Towers (Malay: Menara Petronas, or Menara Berkembar Petronas), are twin skyscrapers in Kuala Lumpur, Malaysia.

According to the Council on Tall Buildings and Urban Habitat (CTBUH)'s official definition and ranking, they were the tallest buildings in the world from 1998 to 2004 when they were surpassed by Taipei 101. The Petronas Towers remain the tallest twin towers in the world. The buildings are a landmark of Kuala Lumpur, along with nearby Kuala Lumpur Tower; they remain the tallest buildings in Kuala Lumpur.

Source: Wikipedia