Extremely rare and impeccably finished, this 3-bedroom + den is one of only two duplex homes located in Chicago's most sought-after building, No. 9 Walton. A gracious foyer welcomes you in, leading to the expansive living room featuring fireplace flanked by custom DeGiulio dry bar with wine refrigeration, providing an elegant entertainment alcove. The adjacent den, overlooking Chicago's Gold Coast and Lake Michigan offers variable options for library or office. Ideal for entertaining, the open dining room leads to light-filled gourmet kitchen with large center island, O'Brien Harris cabinetry, iceberg quartzite countertops and backsplash, outfitted with SubZero and Wolf appliances, attached breakfast room/family room opens to private 300+ square foot covered terrace, considered the finest in Chicago, complete with overhead heater and gas, designed for seamless indoor/outdoor living. Custom lighting, designer window treatments, millwork and hardwood flooring run throughout both levels. A refined staircase leads to the second level's sprawling primary suite complete with luxurious marble spa bath fitted with oversized shower, soaking tub, dual sinks plus vanity table, and stylish custom built-out dressing room. Two substantial en-suite secondary bedrooms and full-size laundry room with folding area complete the space. Enjoy the finest in luxury living with 24-hour door staff, house car, 2-story fitness facility, indoor pool, sauna and steam, golf simulator, dining room with catering kitchen, bar and terrace. Two guest suites available, plus fabulous indoor/outdoor dog run. One valet parking space included, second available for purchase.