RARE OPPORTUNITY to own BOTH #3 & #4, creating an Exceptional Multi-Level offering in the HEART of South End near Back Bay. "IF" Combined These Two Residences offer 5-6 BEDROOMS, 4 BATHROOMS, 3,500 SF Across Four Levels. Unit 3 is distinct layout that offer incredible flexibility to live, work and play in the heart of Boston. Unit #3 is a Parlor & Second Level Duplex. The bright & airy kitchen features paneled Appliances, floor-to-ceiling cabinetry & Waterfall Island, opening to a PRIVATE DECK, Perfect for Morning Coffee. Upstairs, The Penthouse Offers a JAW-DROPPING staircase leads to the bedroom level. Unit #4 offers private elevator access directly to a 1,668 Square Foot Penthouse Duplex with 3 BEDROOMS & 1.5 BATHROOMS. The beautiful kitchen features New Stainless Steel Appliances, custom stone counters & a large island with breakfast bar, opening directly into a spacious living/dining area with grand windows, fireplace & a rear-facing sunroom filled with natural light. Three bedrooms are located on the primary level, including two generous bedrooms with excellent closet space & a versatile third room ideal as a bedroom, office or flex space. EVERY DETAIL has been considered, from Farrow & Ball paint, new Doors, Fixtures & EMTEK Hardware to Lutron Caséta smart switches with dimmers. New German-designed tilt-and-turn aluminum windows offer excellent soundproofing, complemented by custom Shade Store window treatments. Central A/C & In-Unit Washer/Dryer complete the home. TWO DISTINCT RESIDENCES. ONE EXTRAORDINARY OPPORTUNITY. Perfectly positioned just steps from The Prudential Center, 200 Clarendon Street, Newbury Street, Back Bay (T) Station & Equinox Gym.