From Barracks to Commons – Practices of Sensitive and Future-Oriented Urban Transformation

Today, many cities are grappling with vacancy, obsolete infrastructures, and large areas that have lost their original purpose. Mannheim is one of them. In 2009, the withdrawal of the U.S. military freed up almost five percent of the city’s territory overnight. What emerged was not only physical space, but a complex legacy: robust yet challenging building structures, layered histories, and an urgent question of how to responsibly deal with so much newly available land.

Rather than treating these areas as blank slates, the excursions – participants ranged from the interested public to planners, practitioners, administrators, and political representatives from across Germany – approached them as contested and meaningful terrains. What should remain, what needs revitalization, and how can new uses respect historical significance while taking into account future needs? Observing the former Spinelli Barracks, the focus moved between past and present, material substance and social ambition. The iconic U-Halle that later won an award for its adaptive reuse stands alongside newly developed, nature-oriented green corridors, revealing how continuing to build with existing structures can become an act of care rather than replacement.

Throughout the field trip, historical classification and collective memory were interwoven with pressing contemporary themes: climate-responsive and nature-based green space development, resource-conscious construction, and the coexistence of living, recreation, and infrastructure for multiple generations. The collective learnings: a careful yet forward-looking engagement with the built environment – one that balances housing and everyday recreation with ecological repair and a growing awareness of how cities can evolve without erasing what shaped them.