Time and again we see evidence that we stopped expecting buildings to last for eternity many years ago. No sooner the first signs of patina appear on a building – after twenty, thirty or forty years – people start discussing whether it should be torn down, or whether it would make sense to renovate it after all. In a recent interview, DGNB CEO Dr Christine Lemaitre and Thomas Auer, professor for climate-friendly building at the Technical University of Munich, explained why that doesn’t have to be the case.