The Port Authority of New York and New Jersey in the US has hoisted the final two sections of the 408ft steel spire that will crown One World Trade Center in New York.
The each section weighs just over 22t and stands 75ft high. All 18 sections of spire, which together weigh 758t, will serve as a broadcast facility to provide transmission services for the region’s broadcasters.
Installation of beacon on the top the tower will raise its height to 541m making it the tallest tower in the Western hemisphere and third tallest in the world.
The Durst Organization, equity partner the Port Authority, will oversee construction and operation of the facility.
Apart from 18 sections of steel, the spire includes three communication rings and a maintenance platform, which weigh an additional 727t, for a total weight of 1,485t.
One World Trade Center, also known as Freedom Tower, has been designed by the architectural firm Skidmore, Owings and Merrill.
The 104-storey tower will house 3 million square feet of office space, a two-storey observation deck, skyline restaurant, retail spaces, broadcast and antenna masts and four levels of underground parking.
The planned green tower is anticipated to achieve LEED Gold certification and is also expected to house the World Trade Center transportation hub and 9/11 memorial.
One World Trade Center is already 55% leased and the building will serve as the headquarters of the publisher Conde Nast, which has leased more than 1.2 million square feet of floor space, spanning 25 floors.
The tower estimated to cost more than $3.8bn, and is scheduled to open in 2014.
Image: One World Trade Center will be 1,776ft tall and will house 3 million ft² of office space. Photo: Courtesy of Skidmore, Owings and Merrill.