World Trade Center final beam ceremony (19 images)

Assemblyman Sheldon Silver, Silverstein Properties Inc. President and CEO Larry A. Silverstein sign the the final steel beam before it is raised by crane to the top of 4 World Trade Center skyscraper in New York City on June 25, 2012. UPI/John Angelillo

Construction workers sign the final steel beam before it is raised by crane to the top of 4 World Trade Center in New York City on June 25, 2012. UPI/John Angelillo

Assemblyman Sheldon Silver, Silverstein Properties Inc. President and CEO Larry A. Silverstein sign the the final steel beam before it is raised by crane to the top of 4 World Trade Center skyscraper in New York City on June 25, 2012. UPI/John Angelillo

Tishman general contractors Danny Conca and Brian Shelley hold the American flag that is attached to the final steel beam as it raised by crane to the top of 4 World Trade Center skyscraper in New York City on June 25, 2012. UPI/John Angelillo