Honored to present an extraordinary opportunity to own within the iconic Marshall Field, Jr. Mansion, a distinguished Chicago historical landmark in the Prairie Avenue District. Meticulously maintained by the original owner following the mansion's exclusive 2005 conversion into six (6) luxurious residences, welcome to approximately 3,700 square feet of true penthouse living thoughtfully designed with uncompromising attention to detail throughout. This expansive penthouse offers two (2) generously sized en-suite bedrooms, plus an additional bedroom and den, ideal for a home office or flexible living space. Ten-foot ceilings, premium appliances, and a custom surround-sound system elevate the home's sophisticated ambiance. The main level is designed for both comfort and elegant entertaining and features a spacious family room with a Juliette balcony and fireplace; a chef's kitchen for the discerning cook that boasts a newer (2023) Thermador refrigerator, newer (2023) Bosch dishwasher, and Viking 6-burner stove and double oven; a butler's pantry; a formal dining room that can easily accommodate large gatherings; a welcoming living room; a private office with an additional fireplace; and a convenient powder room. The second level is a private retreat, anchored by a luxurious primary suite with two (2) walk-in closets, a fireplace and a spa-inspired bathroom offering a dual sink vanity, a steam shower, separate jacuzzi tub, and refined finishes throughout. An additional en-suite bedroom with its own sitting area and in-unit laundry complete the second level. Other highlights include a newer (2024) water heater, two (2) tandem, attached heated garage spaces equipped with an EV charger, and central air. As if that wasn't more than enough, the six (6) residences are owner occupied supported by a well-managed association with healthy reserves. This penthouse truly lives like a single-family home and is superbly situated in close proximity to Soldier Field, the Magnificent Mile, Millennium Park, public transportation, Lake Shore Drive, Whole Foods, Trader Joe's, restaurants and more. Pet-friendly and truly one of a kind, this penthouse is a rare opportunity not to be missed. Please don't wait. Schedule your tour today. Please note that some photos have been virtually staged so that you can imagine the amazing potential.