As part of its commitment to transitional urban planning, SNCF Immobilier, in conjunction with the City of Paris, is launching a call for projects for two Parisian sites on the Petite Ceinture to host innovative activities and experiment with new urban uses. These are the Gare de Vincennes, in the 20th arrondissement of Paris, and the Voûtes Vaugirard, in the 15th arrondissement.