The focus of our proposal, titled "L' Atelier de l' Arsenal", is the transformation of the underused site of Place Mazas into a new social node for Paris. Located at the junction of Canal Saint Martin and the Seine River, the site forms a critical intersection of cultural, economic, and environmental networks. It is also strategically positioned at the center of important future development projects like the Balade de L'Arsenal, a new urban path, and the new pedestrian waterfront park, parc Rives de Seine. The site is divided into two parts.