Workers pour the concrete roof of One World Trade Center, Tuesday, Dec. 11, 2012 in New York. Behind them is the steel superstructure that will support a 408-foot spire that is expected to rise into the Manhattan sky by spring. (AP Photo/Mark Lennihan)

Associated Press
Workers pour the concrete roof of One World Trade Center, Tuesday, Dec. 11, 2012 in New York. Behind them is the steel superstructure that will support a 408-foot spire that is expected to rise into the Manhattan sky by spring. (AP Photo/Mark Lennihan)
Workers pour the concrete roof of One World Trade Center, Tuesday, Dec. 11, 2012 in New York. Behind them is the steel superstructure that will support a 408-foot spire that is expected to rise into the Manhattan sky by spring. (AP Photo/Mark Lennihan)
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