Sandy Hill is often divided into four areas. North Sandy Hill consists of the area north of Laurier Avenue. This part of the neighbourhood is much older with many of its buildings dating from the nineteenth century. The area is subject to the influences of more recent developments on the thoroughfare of Rideau Street. South of Laurier is South Sandy Hill largely built after the Second World War, though there are a number of much older structures. The far south of neighbourhood below Mann Avenue is an area known as Strathcona Heights. This area is much smaller geographically than the other two but is as densely populated. It consists almost entirely of low-rise apartment buildings that are either subsidised housing or co-operatives. This area was completely redeveloped in the early 1990s. The area below the Strathcona Heights escarpment, near the Rideau River, is known as Robinson village. It was cut off from other neighbourhoods when highways were built, and contains low-rise houses and light industrial uses.