This community federates the actors of the real estate, the urban planning and the property management in order to accelerate the energy retrofitting of the buildings, the development of renewable energies and the climate resilience of Parisian buildings. This community offers thematic conferences that are sources of inspiration and the valorization of good practices, as well as collaborative task-forces or workshops that make it possible to advance on very specific topics, identify the brakes, the levers and the good practices to reproduce. Each workshop is the subject of a deliverable of recommendations and commitments for the concerned actors and the City of Paris.