The structure brings the iconic building in lower Manhattan to its full, symbolic height of 1,776 feet (541.32 metres).
The
US declared independence on July 4, 1776.
The
Port Authority of New York and New Jersey said the spire's installation was
completed on Friday morning.
The
spire in place
Construction
workers below applauded the milestone.
Pieces
of the 758-ton spire were transported to the roof of the building last week.
The
408ft (124.36m) structure will serve as a world-class broadcast antenna.
An
LED-powered light emanating from it will be seen from miles away.
The
addition of the spire makes One World Trade Centre the tallest structure in the
US and third-tallest in the world.
However
building experts disputed whether the spire is actually an antenna - a crucial
distinction in measuring the building's height.
Without
it, One World Trade Centre would actually be shorter than the Willis Tower in
Chicago, which stands at 1,451 feet (442.26 metres).
The
new tower is at the northwest corner of the World Trade Centre site, which is
well on its way to reconstruction with the 72-storey Four World Trade Centre
and other buildings.
It is slated to open for business
in 2014 with tenants to include the magazine publisher Conde Nast, the
government's General Services Administration and Vantone Holdings China Centre,
which will provide business space for international companies.
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