On the Commonwealth Avenue Mall, two Back Bay brownstones from 1880 have become one address. Behind the restored façade are five private residences, where hand-carved marble mantels and cast plaster moldings sit beside Italian kitchens and Carrara marble bathrooms. The Duplex Residences are the final two homes at Maison Commonwealth. Each one spans the Parlor and Garden Levels and offers the scale and privacy of a Back Bay townhouse, with every service of the building close at hand.

Maison Commonwealth