World Trade Center

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** FILE ** In this Sunday, Sept. 22, 2013, photo, One World Trade Center, a skyscraper built at the site of the 9/11 attacks on the World Trade Center is seen in New York. Soaring above the city at 1,776 feet, 104-story One World Trade Center, is America's tallest building and includes office space, an observation deck and restaurants. It is expected to be open in 2014. (AP Photo/Lefteris Pitarakis)

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Lengths of paper are rolled up after etching names at the south tower of the September 11 Memorial during ceremonies marking the 12th anniversary of the terrorist attacks on the World Trade Center in New York, Wednesday, Sept. 11, 2013 (AP Photo/Chris Pedota, Pool)

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President Barack Obama and New Jersey Governor Chris Christie, right, greet workers during a tour of the One World Trade Center site in New York, N.Y., June 14, 2012. (Official White House Photo by Pete Souza)

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**FILE** Homeland Security Secretary Janet Napolitano speaks with New York Sen. Charles Schumer during observances marking the 11th anniversary of the terror attacks on the World Trade Center on Sept. 11, 2012 in New York. (Associated Press)

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The silver spire topping One World Trade Center is fully installed on the building's roof, bringing the structure to its full, symbolic height of 1,776 feet on Friday, May 10, 2013, in New York. The 408-foot spire, weighing 758 tons, will serve as a world-class broadcast antenna. (AP Photo/Mark Lennihan)