Rare extra-wide penthouse duplex blending brilliant natural light with sophisticated design at the South End/Back Bay border. The heart of the home is a dramatic 24-foot-wide living room with exposed brick, a gas fireplace and custom built-ins. Hardwood floors lead to a dining area with a private balcony and a gourmet chef's kitchen featuring Poggenpohl cabinetry, Sub-Zero fridge, and quartz counters. Additional space off the living room for an office set-up. Upstairs, the luxurious primary suite offers a serene retreat with west-facing windows and an ensuite bath with a double sink vanity and steam shower. Two additional versatile bedrooms and a full guest bath complete this level. The crown jewel is a spectacular private roof deck delivering panoramic city views. Steps from the city's finest dining, boutiques, and Greystone. Full-sized W/D and a highly coveted, deeded parking space complete this exceptional offering.