One World Trade Center is to overtake the Empire State Building to become New York's tallest building once a steel column is lifted into place on Monday.
The installation of the column on the 100th floor of the skyscraper will make the structure at the site of the 9/11 attacks 1,271ft (387m) high.
About one floor of the building has been erected per week and it will be 1,776ft tall when completed.
The World Trade Center's twin towers were destroyed on 11 September 2001.
The skyscraper is set to become the tallest building in New York a day before the one-year anniversary of Osama Bin Laden's death.
The rooftop parapet of the building often referred to as Freedom Tower will be 1,368ft - exactly the same height as the original One World Trade Center.
But when all 104 floors of the new skyscraper are finished, including the antenna, One World Trade Center will be slightly taller than its predecessor.
It will also surpass the Willis Tower in Chicago as the tallest building in the US.
Inside, the building will have 69 floors of office space, including restaurants and television broadcasting facilities, as well as an observation deck at the top.
In the shadow of the new tower is the 9/11 memorial, made up of two reflecting pools in the footprints of where the twin towers used to stand.
The first One World Trade Center surpassed the Empire State Building's height of 1,250ft on 19 October 1970.
Although One World Trade Center is set to claim the title of the tallest building in the US, Dubai's Bhurj Khalifa is the tallest building in the world.