The project includes the redevelopment of Square Élisa-Mercœur at the foot of the Château des Ducs de Bretagne, featuring the creation of a mirror pool and a playground. It is part of a broader urban program to design a promenade connecting the train station to the Loire River, while revitalizing the public spaces of the city center.

Designed by landscape architect Bruno Fortier, the project establishes a dialogue between the Château des Ducs de Bretagne and a new urban park, which has become a major space in the heart of the city.