The ‘Stadtwerk mrzn’ was an open and experimental construction site. At Otto- Rosenberg-Platz we were collectively building a local and international future laboratory, full of visions and diversity. Outside and together. With artisans, architects, artists and gardeners, young and old people, new and long-time neighbours, initiatives and associations created common ideas for open spaces, new job perspectives and community urban development. The focus was on their own initiative and enthusiasm for the ‘City’ community project.