Share via Shortlink A rendering of 1228 Madison Avenue and 49 Greene Street (Photos via Robert A.M. Stern Architects; Google Maps) Manhattan has recorded another strong week of luxury deals, as low interest rates, price negotiations and an uptick in buyer confidence bring energy back to the market. In the week ending Dec. 13, buyers signed contracts for 23 properties above $4 million, up from 21 the week prior, according to data from Olshan Realty. The total consisted of 18 condos and five co-ops. “What’s very interesting is the last three weeks we’ve had 57 contracts signed, which is a little better than last year,” said Donna Olshan, who tracks luxury sales. “Right now we are tracking to have as good a fourth quarter as last year.”