A full-floor apartment at the Rosario Candela-designed 778 Park Avenue at East 73rd Street, held by the estate of the New York City philanthropist Celeste Bartos, sold for $18 million and was the most expensive sale of the week, according to city records. Listed for the first time since 1943, the 10-room full-floor unit, No. FL17, had a $22.5 million asking price and has $18,658.32 in monthly carrying costs. The expansive three-bedroom three-bath residence is entered through a formal gallery. There are five terraces - one off the 30-foot living room, which has three pairs of French doors; two, plus a Juliet balcony, off the adjacent library, which has a wood-burning fireplace; another off the dining room; and the fifth off the master with Central Park views. There is also a large kitchen with a pantry, a breakfast room, a double staff room and a laundry. "It's probably one of the all-time greatest apartments I've been in," said the listing broker, Roger Erickson of Sotheby's International Realty, noting the 11-foot ceilings, the grand scale of the rooms, and the city and park vistas. "There were views from literally every window," he said, "even from the kitchen." Still, the original listing suggested the apartment needed updating. "The 17th Floor in 778 Park Avenue is ready for you and your architect to create the perfect home," it stated. Mrs. Bartos, known in private life as Celeste Gottesman Bartos, died last January at age 99. With her husband, the architect Armand Phillip Bartos, who died in 2005, she supported institutions like the New York Public Library and the Museum of Modern Art. Two of her children, Jonathan Altman, from her first marriage, and Adam Bartos, from her second, were listed as the sellers. The buyers were listed as Joseph and Hilary Feshbach. Big Ticket includes closed sales from the previous week, this week ending Tuesday.