Ottawa has several older neighbourhoods clustered around the downtown core, including the Glebe, Sandy Hill, New Edinburgh, Centretown, Lower Town and Old Ottawa South. These areas were mainly built up in the late nineteenth and early twentieth centuries. The houses in these areas tend to be in Victorian or Queen Anne Revival style, but rarely have any conspicuous ornamentation. These are usually two or three storey single homes. Recent infills in these neighbourhoods have often taken the form of townhouses. Red brick, sometimes painted other colours, is the dominant surface material. Most houses have sizable lots, with a driveway running to a shed, or a small lane way running behind the buildings. In the 1920s and 1930s new styles were imported, and many houses from this era take inspiration from the Arts and crafts and Prairie styles.