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On May 10, 2013, the final component of the spire was installed atop the skyscraper, making One World Trade Center tentatively the tallest building in the Western Hemisphere and the third-tallest building in the world by pinnacle height, with its spire reaching a symbolic 1,776 feet (541 m) in reference to the year of American independence.  It has been the tallest building in New York City since April 30, 2012, when its height surpassed the Empire State Building
Taipei 101 participates in the symbolism of a world center where earth and sky meet and the four compass directions join. 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 (January 1 = 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. The main tower features a series of eight segments of eight floors each. In Chinese-speaking cultures the number eight is associated with abundance, prosperity and good fortune. In cultures that observe a seven-day week the number eight symbolizes a renewal of time (7+1). In digital technology the number eight is associated with the byte, being 8 bits. A bit is the basic (minimal) unit of information.
The Shanghai World Financial Center was planned to be the tallest building in the world when it was designed in 1997. The 97 Story building would surpass the spires of the Petronas Towers in Malaysia. When Construction was restarted in 2003, the 508 Meter Taipei 101 in Taiwan was already underway to becoming the World's Tallest Building. Plans where changed but the Tower couldn’t be built any higher than its present height at 492 meters since the already done foundation was meant to support a 460 meter tall building.
The towers feature a double decker skybridge connecting the two towers on the 41st and 42nd floors, which is the highest 2-story bridge in the world. It is not attached to the main structure, but is instead designed to slide in and out of the towers to prevent it from breaking, as the towers sway several feet[specify] in towards and away from each other during high winds. It also provides some structural support to the towers in these occasions
The building has been scaled down from its initial 1.6 km (about one mile) proposal, which was never fully designed, to a height of at least 1,000 metres (3,280.84 ft) (the exact height is being kept private while in development, similar to the Burj Khalifa),[A] which, at about one kilometre, would still make it by far the tallest building or structure in the world to date, standing at least 173 m (568 ft) taller than the Burj Khalifa in Dubai.