A full-floor condominium with ample Park Avenue frontage and white-glove amenities in a prewar building that underwent a luxurious and luminous two-year makeover under the direction of the architect Barry Rice in 2004, sold for $12.9 million and was the most expensive sale of the week, according to city records. The original listing price was $15 million. The residence at 823 Park Avenue, No. 8, has nine rooms and occupies nearly 4,200 square feet. The beige limestone Greek Revival-style building, built in 1911, was originally designed by the firm Pickering and Walker as one of the first rentals on the avenue, with an entire floor devoted to each apartment. The monthly carrying charges, including taxes, for No. 8, a five-bedroom, four-and-a-half-bath unit, are $10,120. Although the building offers no outdoor space, there is a full gymnasium/health club in the basement and an elegant lobby finished in French limestone. The corner living room to the south and mahogany-paneled library to the north sprawl for a full block between 75th and 76th Streets facing west on Park Avenue; both rooms have fireplaces with carved marble mantels and 10-foot-high coffered ceilings. The oversize windows are framed in mahogany, and the floors are polished herringbone oak. The eat-in kitchen has three windows, honed blue slate countertops, and professional-caliber Viking equipment. The master bedroom, tucked away at the back of the apartment for privacy, has southern exposures, oak plank flooring, a walk-in closet/dressing area and an all-marble bath. The sellers, Joseph Oughourlian and Jennifer Banks of London, were represented by Charlie Attias of the Corcoran Group. Michele Kleier of Kleier Residential represented the buyer, the financier Thomas C. Uger. Formerly an independent director of PriMedia, Mr. Uger is a partner in Kohlberg Kravis Roberts & Company and a leader of its media and communications team. Big Ticket includes closed sales from the previous week, ending Wednesday.