Starting from the meaning of the term “decommission”, the paper wants to focus on a specific phase of the life of a building or of an area, on one hand this term indicate the end of a process, that it ismanly related to a use, on the other hand it is open to endless possibilities of reuse and reconversion. The renewal and refunctionalization of an architectural object, area or public and private estate are today considered as an act of enormous value if we consider the even more less availability of greenfield areas and the global emergency that is connected with the climate change. In addition to the customary way of looking at the “decommission” as the end of a cycle, we want to reflect on the positive meaning of this term, that it could be mainly considered as an occasion, more than as a disvalue.