The structure of urban development at the peripheral (as Aigen is) is very heterogeneous, because of the intensive housing development after 1945. Beside some apartments houses are mainly free-standing one- and more-family-houses without a bigger homogeneous urban structure. The houses are mainly used for living. At the border to the natural landscape there are mainly living areas with smaller houses and low density. These are named as “problem zones” for the urban development. The aim is in future to substitute these by “ground-saving” living areas with garden-houses, or attached houses or smaller apartment houses that have a high living comfort and big green areas, but use less ground.
The city part of Aigen goes from the Kapuzinerberg on the right side of the river Salzach till the south border of the city. Aigen had till the 19th century a small centre with a church and the castle of Aigen and a agricultural structure with some farmhouses and manors. Till today the historical buildings in the old centre do exist. After 1945 there were some bigger settlements built and since the 1970 especially on the attractive western hillside housing areas were built.
This part of the city is mainly used as living area (blue colour) especially the hillside is only used as living area. In these areas there are only a few buildings for shops, trade or service.