Located in one of Beacon Hill's earliest buildings, dating to 1804 and designed by Bulfinch, this exceptional 4+ bed penthouse duplex offers nearly 2,200 square feet across two expansive floors. Extensively renovated over the past year and a half, the home combines the scale and character of a historic Beacon Hill residence with elevated modern updates and an unusually wide footprint rarely found on the Hill. Upon entering, you are immediately struck by the masterfully reconfigured kitchen with all new Viking appliances, anchored by a large island and opening directly to a massive private deck. The kitchen flows effortlessly into the dining area and spacious living room, where floor-to-ceiling built-ins and a large fireplace create a striking focal point. Just off the living space is a discreet powder room and a dedicated office highlighted by an arched doorway, additional built-ins, and a bay window overlooking Mount Vernon Street. A dramatic curved bridal staircase leads upstairs to four generously sized bedrooms, two full baths and dedicated laundry. The southern facing primary suite features more floor-to-ceiling built-ins, a fireplace, large walk-in closet, and reconfigured en-suite bath with an added skylight for ample natural light. Southern exposure brings abundant sunlight to the home, highlighting soaring ceilings with original molding, beautiful mantels, original hardwood floors and six fireplaces. Thoughtful details throughout include radiators imported from England, a 650 lbs marble hood vent, and vintage fireplaces recreated to complement the originals. Additional features of this SMART home include all new HVAC systems with central air and multiple heat sources, a 100% owner-occupied building, and an unfinished attic space offering potential for future expansion. The renovation is complete, the heavy lifting is done, and there is nothing left to do but move in and enjoy this exceptional Beacon Hill residence.