Port Authority employee Alicia Ferrera, left, who lost a colleague in the Sept. 11, 2001 attacks, and Hermes Cuervo who lost friends James Cartier and Lester Marino, sign a steel beam near ground zero in New York, Sunday, Dec. 17, 2006. The beam, which was signed by family members of those killed on Sept. 11, 2001, and the general public, is being used in the construction of the Freedom Tower at ground zero.
While her mother Carol Freund, left, watches, Claire Gates, 11, writes a message on a steel beam to be used in the construction of the Freedom Tower in New York, Sunday, Dec. 17, 2006. The beam was signed by family members of the victims of the Sept. 11 attacks and the general public. Carol's brother, Lt. Peter Louis Freund and her cousin, Firefighter Timothy McSweeney, both died in the attacks.
The signatures of World Trade Center victims' families and workers are visible as construction workers adjust one of three 25-ton steel columns into position to be bolted into place at ground zero in New York, Tuesday, Dec. 19, 2006, marking the beginning of the Freedom Tower's vertical construction. The columns, were produced in Luxembourg and fabricated in Lynchburg, Va.
Architect David Childs, far right, points out a detail to New York Gov. George Pataki, third from right, after the first steel columns forming the Freedom Tower were bolted into position at ground zero Tuesday, Dec. 19, 2006, in New York.
Construction workers watch from a ramp as others raise the first of three 25-ton steel columns into position before it is bolted into place at ground zero in New York, Tuesday, Dec. 19, 2006, a milestone in efforts to build a new office tower to replace the World Trade Center.
Workers raise a steel beam that will be part of Freedom Tower at ground zero Tuesday, Dec. 19, 2006 in New York. Several 25-ton steel beams were erected with fanfare at ground zero, marking the first vertical construction of the planned 1,776 foot tower at the site of the Twin Towers.
Construction workers watch as a giant crane lowers the first of three 25-ton steel columns into position to be bolted into place in New York, Tuesday, Dec. 19, 2006, marking the beginning of the Freedom Tower's vertical construction at ground zero. The columns, signed by families of World Trade Center victims and ground zero workers, were produced in Luxembourg and fabricated in Lynchburg, Va.
New York Mayor Michael Bloomberg, left, watches during ceremonies in which the first steel columns for the Freedom Tower at ground zero were bolted into place in New York, Tuesday, Dec. 19, 2006. Developer Larry Silverstein second from right, and architect Daniel Liebskind are also shown.
A commemorative steel beam is raised at the site of the Freedom Tower at Ground Zero Tuesday, Dec. 19, 2006 in New York. Several 25-ton steel beams were erected with fanfare at ground zero, marking the first vertical construction of the planned 1,776 foot tower at the site of the Twin Towers.
Construction workers guide the first of three 25-ton steel columns into position to be bolted into place in New York, Tuesday, Dec. 19, 2006, marking the beginning of the Freedom Tower's vertical construction at ground zero. The columns, signed by families of World Trade Center victims and ground zero workers, were produced in Luxembourg and fabricated in Lynchburg, Va.
Construction workers watch as others guide the first of three 25-ton steel columns into position to be bolted into place in New York, Tuesday, Dec. 19, 2006, marking the beginning of the Freedom Tower's vertical construction at ground zero. The columns, signed by families of World Trade Center victims and ground zero workers, were produced in Luxembourg and fabricated in Lynchburg, Va.
A steel column rises skyward at the Freedom Tower construction site at the World Trade Center on Tuesday, July 29, 2008 in New York.
A worker walks beneath prefabricated arches adjacent to the Freedom Tower construction site at the World Trade Center on Tuesday, July 29, 2008, in New York. The arches will form an underground east west pedestrian corridor connecting Battery Park City and the World Financial Center with the World Trade Center's transportation hub. The connector and transportation hub are designed by architect Santiago Calatrava.
Workers pour concrete at the Freedom Tower construction site at the World Trade Center on Tuesday, July 29, 2008, in New York.
The construction of the Freedom Tower, center, is shown in this overhead view of the World Trade Center site on Thursday, Aug. 28, 2008 in New York. The seventh anniversary of the attacks on the World Trade Center towers is Sept. 11, 2008.