Beautifully maintained 4-bed, 4-bath upper triplex offering over 4,000 sq ft in a historic Marlborough St home. The main level includes a formal living room with floor-to-ceiling windows, custom kitchen with Wolf & Thermador appliances, dining banquette, and family room with fireplace. The full-floor primary suite features a luxurious bath with soaking tub, steam shower, dual vanities, walk-in closet, and sitting room with 2 fireplaces. The top floor includes 3 additional bedrooms, a full bath, laundry room, and storage. A newly built private roof deck with skyline views sits atop a fully replaced roof. Includes 6 fireplaces, artisan finishes and direct-access deeded parking spaces. The common entrance leading into Unit C has also been fully renovated, providing a fresh and refined welcome. Prime Back Bay location near the Quin House, Newbury St, the Esplanade, and top universities