Perhaps it was the lure of a free key to exclusive Gramercy Park, but the as-yet-unfinished gut renovation of a historic Salvation Army rooming house at 18 Gramercy Park South by Zeckendorf Development and Robert A. M. Stern, the premier team that produced the premium price precedents set by 15 Central Park West, has recorded its first closing. A floor-through unit on the ninth floor sold for its full asking price of $16,575,000, an amount that escalated to $16,877,493.75 once the transfer taxes kicked in, and was the most expensive sale of the week, according to city records. The 4,207-square-foot residence has four bedrooms and five and a half baths, and provides treetop views of the park and surrounding historic neighborhood with the addition of 35 large windows. The anticipated monthly carrying costs are $11,200. According to the developer, 8 of the available 16 residences, including a $42 million duplex penthouse with four terraces and two pools that was snapped up by Leslie Alexander, the owner of the Houston Rockets, went swiftly to contract for the full listing price despite being bought off the offering plan. The new owner of No. 9 is Joanne B. Brown, a nom de plume used in this and other real estate transactions by the ex-wife of Jon S. Corzine, the former New Jersey governor. In 2010, Ms. Brown collected $43.5 million after divesting herself of a six-acre property in Sagaponack, N.Y., that she received as part of her 2003 divorce settlement. John Burger of Brown Harris Steven represented Ms. Brown in the Gramercy transaction, and Zeckendorf Marketing handled the sale of the sponsor unit for the developer. Across town, at an address with a different type of cachet, Mr. Burger was involved in another significant negotiation: he represented Darren Star of "Sex and the City" renown in the sale of his luxuriously appointed corner unit, No. 35G, at Trump International Hotel and Tower at 1 Central Park West for $13 million. The initial asking price for the 3,059-square-foot condominium designed by Waldo Fernandez had been $15 million; the buyer is a Los Angeles limited-liability company, Beverly Park Corporation.