180 collective dwellings spread over 8 collective buildings arranged parallel on the slope of the site surrounded by important green spaces. Their construction, in the form of bars and plots, was built in the early 1960s. The collective heating is provided by a boiler room and a substation. The Hot Water Sanitaire is collective for buildings D to G, and individual for A, B and C. Design Realisation Operation Maintenance (CREM): The contract combines the design and operation of heating with the execution of the works in order to meet quantified energy efficiency targets. The contract signed on 28/12/2017 includes a 6-month design phase, an 18-month work phase and the operation of the collective heating and ECS installations from 01/09/2018 to 30/06/2032.