One World Trade Center, now 90 stories high and on its way to being the nation's tallest building, stands above the New York skyline, Monday, Jan. 30, 2012. The Port Authority of New York and New Jersey is aiming for a completion date in the fall of 2013. (AP Photo/Mark Lennihan)

Photo by: Mark Lennihan

One World Trade Center, now 90 stories high and on its way to being the nation's tallest building, stands above the New York skyline, Monday, Jan. 30, 2012. The Port Authority of New York and New Jersey is aiming for a completion date in the fall of 2013. (AP Photo/Mark Lennihan)