In the discussions about sustainable urban development the idea of compact cities is of major importance: new developments, in order to minimize their land-take, should be placed within the existing borders of the city and should be directed towards already developed but under-used areas and empty staying buildings. The URBACT Second Chance network deals with a very important part of this problematic, highlighted in the Baseline Study in the following way. The aim of the network is : (...) the reactivation of larger vacant buildings, building complexes or areas with many vacant buildings, that have lost their original purpose, are in decay and constitute in their current state a problem / challenge for the city and the property owner. At the same time these buildings present a unique opportunity for the sustainable urban development. As these buildings are vacant, they can provide space for needed functions and uses, which so far could not “find their place” in the city or in the neighbourhood ... space for a variety of social, economic, ecological or cultural functions... the network is about reactivating these buildings and embedding the reactivation in the city / neighbourhood development context ... to provide space in the buildings for functions and uses which are needed in the neighbourhood or in the city in general; to support strategic uses of the premises, which bring the interests of the property owner together with the public interest (i.e. interest of the community; notion of common goods). (Second Chance Baseline study).