This project stems from a necessity to double the surface area of a building constructed in the 1970s. Situated on a sloping piece of land, on a university campus in Mulhouse, the 'Maison de l'Université' measured approximately 650m˛ of utilizable surface area before the work of adding its extension began. The need to build on a single floor, adjoining the existing structure, without altering the form of the plot of land through significant and costly earthmoving works, led the architects to design a building in the shape of a ribbon that breaks away in part from the natural terrain, before turning back in a loop against the slope of the land. The building is located next to the main campus entrance, facing the intersection where the Mulhouse tramway has its new stop. While it would be difficult to speak of the main façade concerning the existing structure, that of the extension clearly orients toward a newly designed site.