Mixing housing, business premises and tertiary, the program is divided into two overlapping entities: almost independent, each component is adjusted to its programmatic requirements. The lower part is occupied by Vatel school, its application restaurant and a brewery, and storage. The upper part is dedicated to a Residence-Service for Students. Grouping the collective entities of the CSR, the R + 4 becomes a terrace on the city. Programmatic cutting is noticeable on the facade: each entity is formed of a glazed level surmounted by 3 levels dressed with metal blades serving as brise-soleil. The gap between 2 blades maintains a complete transparency from the inside, while their thickness allows to control the light and to create a changing external appearance. This envelope reinforces the precious and monumental character of the building, while the effect of transparency and light increases the user-friendliness of the spaces and the comfort of the users.