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"More than a decade after a terrorist attack brought down New York's twin towers, their under-construction replacement became the city's tallest building on Monday.
The placement of a column of the 100th floor brought the colossal new steel structure of One World Trade Center tower to a height of 1,271 feet – surpassing the frame of the Empire State Building, which is currently New York's tallest skyscraper, by 21 feet.
Built on what was referred to as ground zero in Lower Manhattan, the building is expected to reach 1,776 feet when it is finished by early 2014. The Willis Tower in Chicago, formerly known as the Sears Tower, is the country's current record holder at 1,450 feet.
The One World Trade Center building will have three top-floor observation decks. Its first 90 floors will be designated for office space, and the following 10 floors will be reserved for air conditioning, heating, and electrical equipment.
http://news.blogs.cnn.com/2012/04/30/one-world-trade-center-to-become-nycs-tallest-building/?hpt=hp_c1
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