Manhattan real estate sales set a record in the fourth quarter of 2007, with residential sales averaging out to be $1.4 million (according to data from Prudential Douglas Elliman), an increase of 17.6% over 2006's fourth quarter. However impressive that statistic is, the growth was primarily driven by super high-end sales of at least $10 million. Apparently sales for condos at The Plaza and 15 Central Park West helped drive the average condo sale......