The Mason House - Historically significant Commonwealth Avenue Mansion underwent a 3 year renovation. A magnificently restored Queen Anne interior is one of Boston's grandest Back Bay homes. 11+ bedrooms, 9 full baths, 5 half baths, Au pair suite, 14 fireplaces, and an elevator to all floors. Grand formal living rooms, intricate moldings, a magnificent marble Music Room, antique stained glass, dramatic Mahogany staircase. Eat-in kitchen opens to large family room. Private Garden, Roof Terrace, 4-5 car garage!