With this approach, the company surpassed the regulatory deadlines of 2012 and 2020 set by the "Grenelle Environment Forum". With a cross-mobilization skills, she has indeed achieved the goal of a positive energy building, with a final standing at CEP - 23 kWhEP / m². year. A comprehensive technical audit before any architectural study, a purely technical analysis was conducted in cooperation with the teaml dedicated to sustainable development, innovation and R & D based on the needs defined in terms of:> surface (the building is 909 m2 to 790 m2 gross floor area of floor space)> Volumetric> functionality. Thermal studies on a bundle of assumptions were then used to design optimal solutions.