Construction workers watch the last concrete bucket with an American Flag raised in the air at the topping out ceremony of 3 World Trade Center skyscraper in New York City on June 23, 2016. World Trade Center developer Larry A. Silverstein was joined by more than 500 union construction workers, as well as a host of public officials, business leaders and representatives from the local community, to celebrate the topping out of 3 World Trade Center. The last bucket of concrete for the 80-story skyscraper will be signed by Larry Silverstein and other dignitaries and lifted 1,079 feet to the top of 3 WTC. The tower is being constructed utilizing an innovative core-first method in which the concrete core is completed first, followed by the perimeter steel, which will reach the top later this year. The tower glass will be completed in 2017, and 3 WTC will open for business in 2018. Photo by John Angelillo/UPI