Many communities in rural areas show a very high percentage rate of building land reserves. Especially in Burgenland, this rate is around 30%, making it one of the front runners. Forecasted population growth in the area of Neusiedl am See will also increase future land use. In case of this building land paradox, that in spite of many building land reserves little building land is available and thus a building land overhang the building land demand, it's important to counteract or contain the increase of future land use in order to keep the resulting consequences for the settlement development of a community, such as possible sprawl, as low as possible. Die to these conditions, weak and growing communities are faced with the chalkenge of developibg the village sustainably into "interior". On one hand, this means utilizing the building land reserves in a community and, on the ither hand, revitalizing and recycling possible vacancies. The problem with that is that almost all building land reserves are owned by private individuals, who do not sell or use them in accordance with the law. The aim of this thesis is to show which possibilities municipalities have by building land mobilization arrangements, to get access to the building land reserves and which laws and regulations to satisfy relating to interior and settlement development. Furthermore, a "best practice" model is being developed by the municipality of Gols in order to show what a possible interior development or densification could look like.