 The firm was perhaps best known for lavish summer houses in Bar Harbour, Maine and for townhouses lining Commonwealth Avenue in the Back Bay area of Boston.According to architectural historian Harry Katz, "Rotch and Tilden developed an 'increasingly sophisticated blending of Georgian and Federal forms.” Two private residences in Montreal display an exhibit an eclectic blend of Jacobean and Richardsonian Romanesque styles.For fifteen years, until Rotch's death in 1894, theirs was one of the most active architectural offices in New England.