Shanghai Tower is the world's third-tallest structure behind a building that reached its full height in which year ?
Shanghai Tower The Shanghai Tower () is a 632 m , 128-story megatall skyscraper in Lujiazui, Pudong, Shanghai. As of 2015, it is the world's tallest building, by height to highest usable floor (Level 127, 587.4 m). It also has the world's highest observation deck within a building or structure (Level 121, 561.25 m), and the world's fastest elevators at a top speed of 20.5 m/s (74 km/h; 46 mph ). It is the world's second-tallest building by height to architectural top (behind Dubai's Burj Khalifa, 828 m) and the world's third-tallest structure (behind Tokyo Skytree, 634 m).
Jeddah Tower Jeddah Tower (Arabic: برج جدة‎ ‎ ), previously known as Kingdom Tower (برج المملكة ) and Mile-High Tower (برج الميل ), is a skyscraper under construction in Jeddah, Saudi Arabia, at a preliminary cost of SR4.6 billion (US$ ). If completed in 2020 as planned, the Jeddah Tower will reach an unprecedented height, becoming the tallest building in the world as well as the first structure to reach the one-kilometre-high mark.