, which appeared in the 80s — makes it difficult to define the term ‘third place’, since its configurations are numerous. If the forms differ, the approach is intended to be common: be an open place for creativity and networking, driven by a community and rooted in its territory. Bringing together public and private actors and drawing on digital tools, a bottom-up approach and a desire to co-build, some third places are developing innovative responses to the challenges facing regions and their populations. They are now real ecosystems of urban innovation. These new places and their impact on living and working patterns are increasingly of interest to public stakeholders, particularly those in planning, for whom these dynamics are potential levers for development. However, the rigid frameworks and methods of these actors seem unsuited to this type of initiative, often collective and iterative. There is therefore a high risk that the institutionalisation of these hybrid and heterogeneous forms of organisation will cause them to lose their innovative character and ultimately their efficiency. In order to avoid this problem, new urban policies need to be designed with a mutability approach around these places, taking into account the various dynamics described above and addressing the unique challenges facing regions and their populations. That is why we wonder whether third parties are able to renew the methods and frameworks in which the players in the city’s factory traditionally operate? In order to study the possible effects of third parties, we will focus here on the case of Coco Velten, a hybrid project for temporary occupation in the Belsunce neighbourhood in Marseille. This experiment has three components: social, economic and cultural and aims to create links between those accommodated in a socially oriented hotel residence and an entrepreneurial and cultural dynamic driven by the other occupants of the place. We will engage in dialogue throughout this theoretical approach and case studies, including through Coco Velten’s observation, in order to analyse the transformative significance of third places in urban production.