A twisting, shimmering, glass-encased skyscraper topped by a spire evocative of the Statue of Liberty, will replace the destroyed World Trade Center towers.
Officials today unveiled the "Freedom Tower" but it is unlikely to end the months of heated argument between architects over the design.
The building will be the world's tallest at 1,776 feet when it is completed by the end of 2008 and is intended to reclaim part of Manhattan's famous skyline shattered in the September 11 attacks.
"We will build it to show the world that freedom will always triumph over terror and that we will face the 21st century with confidence," said New York Governor George Pataki.
The tower on the 16-acre site will overtake Taipei 101 office block in Taiwan as the building regarded as the world's tallest. The Taipei building has not yet been completed but reached its maximum height of 1,667 feet in October.
New York's new tower will contain some similar elements to the original twin towers that stood at 1,368 feet including the restoration of the well-known "Windows on the World" restaurant and an observation deck. But the architects said it would be much safer and more environmentally sensitive.
The entire project, with a memorial to the 2,752 victims at its centre, was estimated to cost up to $12 billion over the next decade, officials said. It also includes six other office buildings and a transportation hub to be designed by renowned Spanish architect Santiago Calatrava.
The plan and model of the building, unveiled at a public ceremony on Wall Street, includes 60 occupied stories, including 2.6 million square feet of office space, rooftop restaurants, and the viewing floor up to a height of 1,100 feet (335 metres).
The space above reaching to 1,500 feet will contain a lacy structure of tension cables similar to those on the Brooklyn Bridge and wind-harvesting turbines to provide 20 per cent of the building's energy, the architects said.
A spire, symbolic of the Statue of Liberty's arm holding up a flaming torch, will rise a further 276 feet (84 metres) to 1,776 feet - the height architect and site master planner Daniel Libeskind chose to represent the date of US independence when he released his initial plan a year ago.
Mr Libeskind described the spire at the top emitting a light into the sky at night, as one that would provide "a beacon of light and hope in a world that is often dark."
Best known for designing the Jewish Museum in Berlin, Mr Libeskind collaborated with David Childs and his team at the New York firm of Skidmore, Owings & Merrill.
The pair feuded for months over the design of the site's signature tower but reached a compromise in time for this week's deadline.
The architects acknowledged the process had been difficult, even "a struggle," but they praised each other's work.