The in-situ concrete flat slabs mainly rest on the load-bearing façades and core walls of the residential units. The non-load-bearing walls in between can thus be changed very easily afterwards and without having to modify the overall supporting structure. A single-storey underground car park connects the lower three building levels and serves as an internal access route. The construction follows the course of the terrain and intercepts the building above it at selected points. The grading of the lower edge of the building is done in such a way that the majority of the floor slabs come to rest in the molasse rock. This means that the buildings can be very easily constructed with flat foundations. This involved a slope cut of up to 8 m into the challenging geological environment, which was carried out with grouted anchors and nailed slopes.