From the end of the 19th century, urban planning composed the setting of a front garden between the facades and the public roads as a way to embellish the many new neighbourhood created at the tune. Apart from the surfacing of the entrance roads and, later, those leading to the garages, these heavily planted areas form beautiful gardens overlooking the street. They offer numerous urban planning and architectural benefits, including increasing the space between the front of the buildings on either side of the street, increasing the natural light in the street and within the buildings and improving the appearance of the structures. From small gardens enclosed by ornate wrought iron railings to simple lawns, the layout of the set-back zones varies depending on time period, building and neighbourhood. Ensuring the long-term preservation of these spaces is a specific priority of the city authorities.