The 53 units for sale at Toll Brothers' Chelsea building, located between Fifth and sixth Avenues, will start at $1.5 million, Von Spreckelsen said. Asking prices for the apartments, almost 80 percent of which will have one or two bedrooms, will average $2,200 a square foot. That's less than the average of $2,663 for new-development listings across Manhattan in the second quarter, according to Halstead Property Development Marketing.