The underlying design principle is heterogeneity. Based on the diversity of developers, authors, and urban context situations, we look for a common denominator that gives the ensemble a design unity: Diversité dans l’Unité! The focus is not only on the block or building structure, but on the urban interspaces, i.e. streets, alleys, and squares. Across construction sites, individual design rules apply to these “strips”. In this way, their specific characteristics can be strengthened. It is required that the architectural expression of all buildings must relate to the area’s industrial past. The design means can be freely chosen and can be derived from completely different themes, e.g. from materiality, volumetry, construction, physiognomy, or the colour scheme. Each building site must make a contribution to the district, such as day-care centre, plant garden, or workshops.