UMBAU (conversion) means the continuous transformation of existing structures. Considering today’s climate goals, UMBAU must move from being the exception to becoming the rule. The exhibition contributes to this by discussing projects by the architects von Gerkan, Marg and Partners (gmp) as precise case studies of conversion practices from the 21st century dealing with the architectural heritage of the modern 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. Practice shows that UMBAU must also integrate new settings and superimpositions. UMBAU is not unique, but continues into the future as a nonstop transformation, as a collaboration spanning generations.