The extension to the existing Paula-Zundel children's home in Tübingen-Lustnau is a three-storey solid construction with a green flat roof. In addition to group rooms, the new part of the building also houses the kitchen, staff rooms, office and storage areas as well as a column-free multi-purpose area on the first floor. The dimensions of the building are approximately 12.7 x 24.0 m in plan with a total height of approx. 10.7 m. The sloping construction site results in variable building heights above ground level.
Various structural concepts were developed during the design phase, including a load-bearing timber construction with timber-concrete composite ceilings. However, at the client's request, the load-bearing structure was designed as a reinforced concrete construction. The floor slabs, as well as the roof slab, are designed as solid flat slabs with a thickness of 25 cm. The vertical load transfer is achieved by 20 cm thick wall panels arranged largely on top of each other. In the column-free multi-purpose area on the first floor, the ceiling on the upper floor is supported by wall-like beams in axes B and 2. The offset of the load-bearing axes C and D is also supported by wall-like beams, some of which are cantilevered. The building is braced against the effects of wind and earthquakes by a sufficient number of wall panels on all floors. The building is founded on a beam grid with a cross-section of approx. 80×80 cm, which is supported by deep foundation elements down to the load-bearing subsoil at a depth of approx. 3.0 m.