Umbau (german for “conversion”) means the continuous transformation of existing structures. Considering today’s climate goals, Umbau will move from being the exception to becoming the rule. The exhibition by von Gerkan, Marg and Partners Architects (gmp) discusses recent case studies of conversion practices from the 21st century dealing with the architectural heritage of the Moderne movement. What the projects have in common is a conceptual approach to Umbau, which, starting from a comprehensive inventory of the existing, continues and develops the old as an architectural evolution. Umbau is not unique, but continues into the future as a Nonstop Transformation, as a collaboration spanning generations.