The cornice, belt courses, windows, and front door all give clues about the style and, by extension, the year of construction. Row homes erected in the twentieth century, as early as 1910, have a Colonial Revival feel to them, often replicating existing brick Federals. Later examples, built after 1960, tend toward the cookie-cutter nature of much modern housing development. By contrast, eighteenth-century row houses were unique structures. They usually featured asymmetrical bays articulated by flat pilasters or rounded Doric columns. The roofs were hipped or gabled, and there may have been dormers, pediments, or other ornamentation. Amenities such as fireplaces, chandeliers, and pantries were included in some models. A few even had elevators! Early American architects adapted many foreign styles during the Colonial Period, but by the nineteenth century they were developing their own identity marked by an emphasis on symmetry, simplicity, and durability. The row house is one of the most enduring symbols of American architecture. It was first popularized in Boston by John Howland, who constructed several dozen dwellings between 1705 and 1725. These one-story cottages had simple designs influenced by Dutch and English builders but featuring uniquely American elements such as square pines for support posts and glass for window frames. Howland's creations are now recognized as the first row houses in America.