Developer Larry Silverstein, back row second from right, and New York City Mayor Michael Bloomberg, back row fourth from left, watch as Conde Nast chairman, Si Newhouse Jr., front row center, and executive director of the Port Authority of New York and New Jersey, Chris Ward, front row left, and David Samson, chairman of the Port Authority of New York and New Jersey, sign a lease during a news conference on the 34th floor of 1 World Trade Center, Wednesday, May 25, 2011 in New York. The agency that controls the new landmark tower rising at the World Trade Center approved a deal Wednesday that will bring in magazine publisher Conde Nast as a tenant. (AP Photo/Mary Altaffer)