The United Nations, which is searching for a temporary home for when renovations begin on its Manhattan headquarters in 2007, is considering a move to one of the new buildings on the World Trade Center site, real estate executives say.

The building, 7 World Trade Center, is one of a number of sites round New York that the UN is considering. But word of its interest will be welcome news to Larry Silverstein, the developer, who has yet to find outside tenants for the buildings he has planned for the site.