During the interwar period, Hove experienced rapid residential development, mostly northwards on to the southern slopes of the South Downs. Before the mid-1920s, the Old Shoreham Road to Shoreham-by-Sea formed the boundary of the urban area; thereafter, housing estates such as Hangleton grew rapidly (especially after it became part of the Borough of Hove in 1928). From the beginning, it was expected to be a large suburb; by 1935, houses covered .