Renovation work is nearing completion at 110 Central Park South were 63 apartments are being converted to cooperative ownership in a plan that allows buyers to sell or sublet without board approval much like a condominium.

The 28-story building has five penthouse units and apartments ranging in size from one- to four-bedrooms.

The building has an ornate and handsome entrance marquee, a 24-hour doorman, a concierge, a live-in resident manager, a fitness center on the second floor with an outdoor terrace and breakfast bar and a basement laundry room in addition to washers/dryers in all apartments.

The building, which is between Avenue of the Americas and Seventh Avenue, was most recently the Inter-Continental Hotel and prior to that the Ritz-Carlton Hotel.

It was erected by Samuel Minskoff in 1925 as the 25-story Navarro with 118 hotel-apartments. In the 1880s, Jose de Navarro built eight connected buildings, 10 stories high, that were known as the Navarro Flats that included the present site as well as those now occupied by Essex House, Hampshire House and the New York Athletic Club. Eventually this site was occupied by the Deutscher Verein, a German social group housed in a palazzo-style structure designed by McKim, Mead & White. That building eventually became the Army & Navy Club until it was replaced by the present building.

One of the early residents of the building was Bennett Cerf, the publisher of the Modern Library and Random House. Other residents included Raymond Loewy, the industrial designer, and Earl Carroll, the nightclub impresario.

Costas Kondylis is the architect for the conversion.

The building has a six-story limestone-clad base with pilasters between the 3rd and 5th floors. It has discrete air-conditioners and offers storage space and valet parking. Kitchens will have PoggenPohl cabinetry, SubZero refrigerators and Miele cooktaps and an Asko washer and dryer. Bathrooms will have sycamore vanities with marble tops, Kaldewei bathtubs and frameless glass shower enclosures. Gustavo Martinez has designed the building's model apartment.

The $110 million conversion by Anbau Enterprises has added three floors to the building, which will have five penthouses with some fireplaces and a total of 63 apartments. Three of the penthouses occupy full floors of about 4,000 square feet each. The principals of Anbau are Stephen L. Glasock and Barbara van Beuren, both architects.

The penthouse on the 24th floor has four bedrooms, four baths, a powder room, a fireplace, and terraces. The penthouse on the 27th floor has two bedrooms, two baths, a powder room, and a 50-foot-long loggia and terrace. The duplex penthouse on the 28 and 29th floors has two bedrooms, 50-foot-long loggias on both levels, and two fireplaces.

One-bedroom, one-bath and powder room units range in size from 1,026 to 1,039 square feet are now priced at $1,440,000 to $1,760,000. Two bedroom, two full baths and a power room units ranging in size from 1,849 to 1,971 square feet, are now priced at $3,507,000 to $4,717,194. Three-bedrooms, three full baths and a powder room with 2,391 square feet are priced at $4,467,600 to $4,161,200. One of the penthouses is priced at about $14,4000,000.

With a month or two of purchase new owners can move into fully furnished apartments, according to Mr. Glascock of Anbau, which is German for "to add onto," or, "to build onto."