The Mason House is a historically significant mansion located at 211 Commonwealth Avenue in the Back Bay section of Boston, MA. The Queen Anne style interior underwent a 3 year renovation. It boasts 14,580 square feet of living space with 11 bedrooms, 9 full and 5 half bathrooms, Au pair suite, Mahogany staircase, 14 fireplaces, elevator, grand formal living and dining rooms, home office, intricate moldings and antique stained glass throughout, marble music room with coffered and domed ceilings, eat-in gourmet kitchen, family room, private garden, rooftop terrace and a 4-5 car garage. It is listed at $17,900,000.