817 Fifth Avenue, located in the coveted Lenox Hill area, is a low-profile yet highly sought-after prewar condo building. Converted to condos in the 1970s, this 15-story building offers 16 homes—mostly full-floor residences, plus a unique maisonette triplex with a private entrance at 816 Fifth Avenue. All units feature wood-burning fireplaces, high ceilings, original crown moldings, hardwood floors, and spacious, elegant living areas.