Long-term civic–municipal collaboration around developing public urban greenspace has been increasing in many European cities in the last decades. This novel tendency in urban spatial development is explored via a case study set in a Danish context. Here the municipal landowner, alongside a civic association, has developed an overgrown public urban greenspace into a thriving recreational area through a dedicated collaboration spanning more than six years. I deploy the concept of commonality from the sociology of engagements, developed by Laurent Thévenot, to unfold an integrated analysis of the multiple situations of social coordination and engagement constituting this collaboration. I argue that the ability to accommodate, compose and connect several differing ways of engaging with urban greenspace, is beneficial in sustaining long-term civic–municipal collaboration and securing the civic anchorage of greenspace planning. I discuss the implications and generalisability of these findings.