Extremely rare offering-only one of two units like this in the entire building! This expansive 2610 SF residence at the Gold Coast's most exclusive address features a split 2-bedroom layout with two private, luxe suites and extraordinary attention to detail throughout. The designer kitchen is a showstopper with Iceberg Quartzite countertops and full-height slab backsplash, built-in wood cutting board, O'Brien Harris custom inset cabinetry, Sub-Zero refrigerator/freezer, and a Sub-Zero wine column. The elegant primary suite includes a large walk-in closet plus additional custom wall closets. The spa-caliber bath features an oversized walk-in shower with rain, handheld, and traditional-style shower heads, O'Brien Harris dual-sink vanity, Kallista plumbing fittings, a custom makeup dressing table, and a Victoria + Albert freestanding tub. Additional highlights include a mudroom with custom designed full height cabinetry adjoining the laundry room, a fireplace with stunning stone surround, and a beautiful covered terrace with overhead heater. Residents of No. 9 Walton enjoy unparalleled five-star amenities, including a multi-level fitness center, an indoor pool, a steam room, and a sauna. For recreation and entertainment, the building features a golf simulator and an elegant hospitality room with a bar, catering kitchen and an expansive terrace. Additional luxuries include two well-appointed guest suites, a house car service, 24-hour white-glove door staff, and onsite professional management. A rare opportunity to own in one of Chicago's most prestigious buildings!