NEW YORK, NY – SEPTEMBER 07: Construction workers ride an elevator down from the top floor at Four World Trade Center on September 7, 2012 in New York City. As New York City and the country prepare for the 11th anniversary of the September 11, 2001 terrorist attacks, work proceeds at the former site of the World Trade Center Towers. The 16-acre site, which is owned by the Port Authority of New York and New Jersey and is being rebuilt with developer Larry Silverstein, has a projected price tag of $14.8 billion. Of the four office towers planned for the site, two have had finishing beams placed on their top floors and the above-ground memorial was completed in time for the 10th anniversary last year. (Photo by Spencer Platt/Getty Images)