Some_Guy
http://www.flickr.com/photos/matthewj/2481355031/in/set-72157604988911230/
Looks like two to me.
Take a gander at that, if you want. Some pretty amazing shots.
Uh, that's Liberty City's recreation of the World Financial Center.
The Empire State Building and the Chrysler Building are visible from the rooftop of the skyscraper Stay Puft attacks, I can't say the same about the World Trade Center… If they're going for an accurate New York geography, you wouldn't be able to really see them that clearly, I'd imagine.