More important than that, though, is that there simply is no market in lower Manhattan for that much office space. In fact, I'll be very surprised if the building described in this article is completed by 2010. Larry Silverstein, the developer who owns the rights to build on this site, is in the process of re-building 7 World Trade Center -- the 52-story building at the north end of the site that also came down on 9/11. He has yet to sign a single tenant to a lease in that building.
AC---I am certainly not expert on the subject, but I am pretty sure that residential space in Manhattan is at a premium, with very high rents and selling prices for small amounts of space. Therefore, I wonder how a new "twin towers" comprised of 1000 prestige apartments in lower Manhattan would sell/rent?