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Taipei 101, formerly known as the Taipei World Financial Center, is a landmark supertall skyscraper located in Xinyi District, Taipei. With 101 floors above ground and 5 floors underground, Taipei 101 displaced the Petronas Towers in Kuala Lumpur, Malaysia, as the tallest building in the world by 56.1 m (184 ft).The building ranked officially as the world's tallest from 2004 until the opening of the Burj Khalifa in Dubai in 2010. In July 2011, the building was awarded LEED Platinum certification, the highest award in the Leadership in Energy and Environmental Design (LEED) rating system and became the tallest and largest green building in the world. Taipei 101 was designed by C.Y. Lee & partners and constructed primarily by KTRT Joint Venture. The construction was finished in 2004. Taipei 101 is designed to withstand the typhoon winds and earthquake tremors common in its area of the Asia-Pacific. Planners aimed for a structure that could withstand gale winds of 60 m/s (197 ft/s, 216 km/h or 134 mph) and the strongest earthquakes likely to occur in a 2,500 year cycle. Thornton-Tomasetti Engineers along with Evergreen Consulting Engineering designed a 660-tonne (728-short-ton) steel pendulum that serves as a tuned mass damper, at a cost of NT$132 million (US$4 million). Suspended from the 92nd to the 87th floor, the pendulum sways to offset movements in the building caused by strong gusts. Its sphere, the largest damper sphere in the world, consists of 41 circular steel plates of varying diameters, each 125 mm (4.92 in) thick, welded together to form a 5.5 m (18 ft) diameter sphere. Two additional tuned mass dampers, each weighing 6 tonnes (7 short tons), are installed at the tip of the spire which help prevent damage to the structure due to strong wind loads. The height of 101 floors commemorates the renewal of time: the new century that arrived as the tower was built (100+1) and all the new years that follow (1 January = 1-01). It symbolizes high ideals by going one better on 100, a traditional number of perfection. The number also evokes the binary numeral system used in digital technology.