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However, it was much harder to find adequate amounts of development land in inner city areas which led to the building of high rise tower blocks which allowed a greater number of people to be housed without increasing the total area of the development land required (Sheail, 2002 p. 62). Unfortunately, high rise tower blocks constructed during the 1960s and the 1970s in the South-East of England, as well as nationally failed to be an adequate form of long- term and sustainable architecture that allowed people to be housed in safety or comfort.
The failure of many high rise tower blocks to be sustainable forms of housing had the affect of increasing the pressure on development land. It has also meant that tower blocks have had to be refurbished or more frequently demolished (Meller, 1997 p. 63). As the picture below shows the 1950s and the 1960s also witnessed the construction of low-rise apartment blocks which have proved to be longer lasting than tower blocks built during the same period of time. The picture is of apartment flats constructed in Ham Common in Richmond between 1955 and 1958 (Frampton, 1997 p. 266).
Although the amount of new housing construction was considerable not all the available land had been developed or built upon. Land remained set aside for agricultural purposes, whilst other land was left un-built upon and not always used for farming. The land that was left alone and was set aside and thus not allowed to be used for domestic housing or industrial sites were referred to as the green belt. The green belt was created to act as a buffer zone between urban and rural areas as a means to limit urbanisation (Greed, 1996 p. 82). Central government set aside areas that were designated as green belt zones to preserve the countryside nationally as well as solely in the South-East of England.
Although, it was possible to build on green belt land the process of gaining planning permission from central government and the relevant local authority was a long drawn out one which deterred most property developers and construction firms from doing so. Local interest groups have often being highly vocal in their opposition to any schemes that have been suggested (Clapp, 1994 p. 138). Clapp estimated that with national parks and designated green belt zones that in England and Wales ‘more than a fifth of the countryside now has stringent protection against development' (Clapp, 1994 p. 140). Therefore, the bulk of available development land was concentrated in urban areas, often referred to as brown field sites (Greed, 1996 p. 82). For central government there are advantages for using brown field sites (Kim & Rigdon, December 1998 p. 5). For instance, using such sites allows for economic regeneration, employment creation as well as less pressure to build on green belt land.