In the late 18th century, Montréal had outgrown its walls and among the first neighborhoods to be developed was the Plateau Mont-Royal. It is still a lovely residential area, and also has busier commercial streets lined with small shops and restaurants. At the heart of the neighborhood, on Rue Saint-Denis, Square Saint-Louis (Carré Saint-Louis) is the green heart of the neighborhood. Laid out in 1876, its Victorian design matches the row houses of the same era that overlook the square. Made of typical greystone with mansard roofs, they provide a popular Montréal photo op.