NY Sun reports something we already know: the residential real estate market in Harlem is hot. Some stats to back that up: since 1990, about 4,550 units of free-market condominiums have been developed in Harlem, of which almost all (4,300) have been built since 2000. Furthermore, approximately 1,600 units have been proposed for construction in 2007. According to one real estate executive, of the three Harlems "East Harlem is still grossly underdeveloped by most standards". Perhaps not for very long?