4 bed, 4 bath, more than 4,000 square feet, and direct-access deeded parking distinguish this exceptional upper triplex in a historic Marlborough Street residence. The gracious main living level features a formal living room with dramatic floor-to-ceiling windows, a custom kitchen equipped with Wolf and Thermador appliances, a dining banquette, and an inviting formal family room with two fireplace’s. Occupying an entire floor, the expansive primary suite offers exceptional privacy and includes a sitting room, a fireplace, walk-in closet, and a luxurious bath with a soaking tub, steam shower, and dual vanities. The upper level provides three additional bedrooms, (one could be a great office) a full bath, a dedicated laundry room, and generous storage. Crowning the residence is a private roof deck featuring new composite decking, sweeping views of the Boston skyline, and convenient access to water, gas, and electricity. Significant 2026 improvements include a new roof, re pointed rooftop brickwork, fresh paint throughout the common staircase from top to bottom, a renovated common entrance, a new intercom system, and professionally landscaped exterior areas. Additional highlights include a total of six gas fireplaces, artisan finishes, and direct-access deeded parking. Ideally situated in the heart of Back Bay, moments from the Quin House, Newbury Street, the Charles River Esplanade, and Boston’s leading universities