 The third floor, with its warren of leased rooms, was gutted and the resulting space joined to the second floor to create space for a highly ornamented, double-height hall (designed by member architect Joseph Everett Chandler, a Colonial Revival specialist) thereafter known as the Marsh Room.The condition of Marsh's bequest was that the room in her honor be open during weekdays (provided there's no association gathering) to local musicians for practice.Of the builders of the association, particular mention should be made of John Sullivan Dwight, a noted transcendentalist and member of the Brook Farm movement, who for many years published a recondite Journal of Music and was widely known as one of the nation's outstanding musicologists.