Assertion: building's construction | /r/HasProperty | the burj khalifa
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text: This laid the foundations for the tube structural design of many later skyscrapers, including his own John Hancock Center and Willis Tower, and the construction of the World Trade Center, Petronas Towers, Jin Mao Building, and most other supertall skyscrapers since the 1960s, including the world's tallest building as of 2017 , the Burj Khalifa.