This 4,500-square-foot full-floor Gold Coast cooperative offers exceptional scale, privacy, and architectural significance. With 10.5-foot ceilings, expansive proportions, and open views of Goudy Park, Lake Michigan, and the city skyline, the residence lives like a single-family home in a prestigious, full-service building. Originally owned by the building's architect, Philip Maher, and later acquired by Potter Palmer II as a wedding gift for his son, the apartment has been thoughtfully enhanced over time, most recently with interiors by Colfax and Fowler, blending historic character with a timeless, livable aesthetic. Beautifully preserved original detailing includes refined moldings, paneled walls, herringbone floors, and two fireplaces. A remarkable library attributed to David Adler features light-pickled Canadian spruce paneling and a concealed door to the living room. Additional Adler-inspired elements include the primary suite, where an imported Versailles parquet floor and elegant bath finishes create a sense of timeless luxury. The layout is both gracious and highly functional, with a formal entry foyer, expansive living and dining rooms, and a Christopher Peacock kitchen complemented by the original butler's pantry and a breakfast room. There are three large en suite bedrooms, along with two additional maids' rooms and a full bath, offering exceptional flexibility for offices, guests, or fitness. The primary suite, reconfigured by Maher, includes dual baths and a beautifully paneled dressing room. Additional features include SpacePak central air conditioning, in-unit laundry, a secondary laundry room, and a private storage room. Convenient garage parking is available close by. Available for the first time in 40 years, this rare offering delivers the presence of a grand historic home with the simplicity and security of cooperative living in one of Chicago's most established neighborhoods.