Due to the economic decline in the 1990ies vacant (former) industrial buildings and housing can be found everywhere in the city. Many of the vacant buildings are in poor conditions and partly a public security hazard whereon the city administration has to correspond. The vacant buildings cause a negative impact on their environment through the disturbance in the cityscape, a negative image and trading down processes. This situation leads also to public criticism towards the city administration how they handle the issue. As the economic development is not that strong, there is not an increasing demand for commercial and housing space. This hampers to bring the vacant buildings in use, in particular from the economic point of view. In addition there are limited funds to support the rehabilitation and re-use of vacant buildings, in particular which present a cultural heritage value.