Battery Park City is home to some of the most impressive new condominiums in Manhattan. You probably already know this. The condominiums for sale in Battery Park City are also some of the greenest condos for sale in Manhattan. You may already know that, too. But something you might not know -- and which the New Construction Manhattan blog didn't know, either -- is that the condominiums for sale in Battery Park City are also kinda-sorta rentals. It's complicated, but condo buyers in Battery Park City are paying not just for those LEED-certified condos, but for the land on which those condos sit. No, not in a location-location-location sense. More in a "ground lease" sense. Again, it's complicated. But with ground leases set to spike in 2011, it has suddenly become difficult to buy a condominium in Battery Park City.