Welcome to Residence Six, a one-of-a-kind engineering marvel that combines a historic 1905 structure with a modern French Zino Cantilever Zinc addition, showcasing architectural brilliance. Designed by ShoP Architects, this boutique condominium offers 20 exclusive residences. Spanning 5,444 square feet, the full-floor unit is accessed via a keyed elevator and features a private south-facing terrace. Inside, you'll find five-bedroom suites with luxurious en-suite baths and the option to convert a sixth. The expansive eat-in kitchen opens to a den and bar area, while a versatile playroom or library adds extra living space. The residence includes six en-suite baths, a powder room, and a private refuse room. Interiors feature custom 12-inch-wide oak flooring in a herringbone pattern with brass inlay, 10-foot ceilings, and 32 custom Hope's steel-framed windows, along with historically replicated Parret windows. Hand-burnished brass hardware, Meljac brass electrical accessories, and a fully integrated Savant Smart Home system offer state-of-the-art technology. The residence is a collaboration between Eric Sheffield Architects, designer Paris Forino, and master builders Think Construction, blending timeless design with modern innovation. Key features include 24/7 doorman service and a stunning entrance foyer with a rose mirror, brass, and gunmetal steel door, leading to a marble floor laid in a chevron pattern with brass inlay. A 44-foot hallway with artisan lime plaster and mid-century modern sconces connects the living and sleeping quarters. The Grand Salon, with 12-foot ceilings and floor-to-ceiling windows, opens to the private terrace and features oak flooring, a marble fireplace, and a cozy library corner. Residence Six at 66 Ninth Avenue is an ultra-luxury masterpiece of bespoke design and craftsmanship, offering refined living at its finest.