The conjunction of geophysical and regulatory constraints rendered this plot of land difficult to build upon: its elongated form, its gradient exceeding 10%, and the very restrictive POS regulations applicable to it, were a priori incompatible with the size and demands of the project. These conditions led us to develop the entire project within a construction adapted to the form and constraints of the land. The building unfolds in length from east to west, while its height, made of up of four trays slightly shifting away from one another, follows the natural slope. Its height never exceeds the maximum authorized 10m (the equivalent of three floors) at any point level with the land. The building was also positioned near the plot’s northern dividing boundary, which allowed us a POS (H=L), hence a progressive spacing in relation to this boundary, as it goes along and the land descends. This proximity allowed us to free up the southern side so as to build the living spaces of each unit with a terrace attached to each. The roofs are visible, all planted, which helped dampen the impact of construction in the neighborhood.