A landmark opportunity on Beacon Hill's iconic Mt. Vernon Street - this wide, five-story NEW CONSTRUCTION single family overlooks Louisburg Square and has a rare private rear entry from famed Acorn Street. Behind the classic brick facade lies a full gut renovation with all new structural framing, high-end finishes, and an elevator to every level. Enjoy city views from the roof deck or unwind on the garden patio with a sleek entertaining kitchenette - perfect for hosting or quiet retreat. Timeless elegance meets modern luxury in every detail, from ornate custom mantels framing four gas fireplaces to a Lacanche range and many other high-end appliances. The floor-through primary suite has 2 spacious walk in closets, an opulent bathroom, and a home office. 4 additional bedrooms, an au pair suite, and two family rooms offer flexibility across all levels. 1 garage parking at Brimmer St included.