Sevens Theme Department Store Düsseldorf Difficult local conditions: adjacent buildings with 1 and 2 basement floors respectively, underground railway, close to the ditch of the boulevard Königsallee. Consequence: topped construction method 5 basement floors, 4 of them parking floors, 20 m underneath the level of the boulevard Königsallee; in-situ concrete diaphragm wall, precast pillars, slices of diaphragm walls; basement floor ceilings are 30 cm thick flat floor slabs of reinforced concrete, white sump pan with 30 cm thick outer walls of reinforced concrete. Country: Germany, Federal State of Nordrhein-Westfalen Client: Sevens Düsseldorf GbR Construction period: 19 months Services: of the load-bearing structure planning