Schinkelplatz is a prominent square in the historical centre of Berlin. Directly opposite the Humboldt Forum, that is housed in the reconstruction of the Berliner Stadtschloss (Berlin City Palace), a seven-storey building complex emerges between the Bauakademie (academy of architecture), the Friedrichswerder church and the Kommandantenhaus. It consists of three residential buildings (jointly planned by the two architectural practices Steidle and Brenner), an office building by Staab Architekten, and a shared two-storey underground car park. The building units comprise solid constructions made of reinforced concrete and brickwork. Facing the inner court yard, the upper storeys feature multiple layers of building recesses and are supported by the floor slabs. Reinforced concrete slurry walls form the impermeable construction pit. These are supported by a level of steel bracing and HDI high pressure injection improved ground.