Düsseldorf is the state capital of North Rhine-Westphalia and the administrative center of the administrative district of Düsseldorf. With 635,704 inhabitants, the independent city on the Rhine is the second largest city in the country after Cologne. Düsseldorf is part of the Rhine-Ruhr metropolitan region with around ten million inhabitants and the Rhineland metropolitan region with 8.6 million inhabitants. The city lies at the core of the central European economic area.

„With many years of experience in the implementation of highly complex building projects, we are there for you with our highly qualified specialist staff." Ferdinand Tönnis branch manager Düsseldorf

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