Marketing has begun for the residential conversion of the 16-story office building at 90 William Street in Lower Manhattan.

Mario J. Procida and Louis V. Greco Jr. bought the building in 2005 for about $32 million and are converting it to 113 residential condominium apartments.

The building, which is located at the southeast corner at Platt Street, was erected in the late 1960s and fronts on a large plaza just to the north of the Federal Reserve Bank Building and it is one block north of the delightful small park with large Louise Nevelson tree sculptures. It is across William Street from the Zeytuna Food Court, one of the largest and most popular food markets and restaurants in Lower Manhattan.

The building has consistent fenestration and a revolving door entrance. It was formerly owned by the Scottish Amicable Life Assurance Society and Joseph Moinian.

Bradford Perkins of Perkins Eastman Architects is designing the conversion, which will have 8 apartments per floor.

The building is being marketing as "be@William" by SDS Procida, which is building On Prospect Park at 1 Grand Army Plaza, a 114-unit residential condominium building designed by Richard Meier that is scheduled for completion next year. It is also developing an 82-unit project at 405 West 53rd Street and 189 Schermerhorn, a 25-story tower and a 7-story loft building arranged in a mews-like setting with a private courtyard in Brooklyn.

The building will have a "be@spot Sky Lounge" rooftop amenity center that incorporates all of Be@William's common spaces and activities, an indoor/outdoor space with kitchenette and indoor/outdoor fireplace and fitness center.

The building will have a 24-hour doorman and concierge service and private storage units.

Prices range from about $510,000 for a 640-square-foot studio on the 5th floor to about $1,283,000 for a 1,186-square-foot, two-bedroom, two-bath unit on the 15th floor.