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The Freedon Towers will be completed on time

The rebuilding of New York's World Trade Centre site may take up to three decades to complete because the demand for office space has shrunk with Wall Street's falling fortunes.

The Port Authority of New York and New Jersey, owner of the 16-acre site in Lower Manhattan, yesterday said it was taking a cautious approach after a study showed that it could take until 2037 to lease all the planned office towers.