Construction workers Danny Conca (left) and Brian Shelly hold an American Flag attached to the last steel beam, signed by members of the crews that helped build the tower, as it is hoisted 977 feet to the top of Four World Trade Center on June 25, 2012 in New York City. The trapezoidal glass and steel office building, which is designed as an architectural backdrop to the September 11 Memorial, is scheduled to open in 2013.
Construction at 4 World Trade Center finishes today.
On Monday, construction workers and officials are gathering with developer Larry Silverstein to see the tower's final steel beam signed and lifted up 977 feet and placed at the top of the building, the Associated Press reported.
The 72-story, 2.3 million-square-foot building was designed by Fumihiko Maki and is due to open in the fall of 2013, Crain's New York.
The AP reported Tower 4 will be the first of the World Trade Center's structures to be completed on the 16-acre site since the 9/11 attacks.
But as Crain's wrote, while it may be the first, it is not the tallest.
More from GlobalPost: World Trade Center to become New York's tallest building
About a third of the offices will contain the headquarters of the Port Authority, which owns the trade center site.
The New York Times reported that most New Yorkers haven't heard of Tower 4 because its Japanese architects "deliberately designed their tower to be understated and deferential."
“We like the idea of the building dematerializing,” Osamu Sassa, the project architect told the Times.