The use of listed buildings mainly for economic, but also for cultural purposes, is probably the most important topic of monument law. Walter Georg Leisner justifies the thesis: There is "monument appropriate" usability of protected buildings and facilities. It is immanent in these objects as such, and must therefore be examined when the concept of their worthiness as a monument is being clarified, not only when the status of protection becomes reasonable. This already corresponds to existing monument law, the law governing the constitution of property and the tax-relevant promotion law, and should become generally accepted in the dogmatics of the law of monuments. This view is based on the "living monument", facilitates contemporary conversion, from the castle to the residential building, allows flexibility in practice and thus increases the acceptance of monument protection. As reference area serve de.