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* The source added the following information for each of the areas included;

Berlin: The Berlin city area and surrounding communities are included in the study.
Düsseldorf: The following towns are covered: Düsseldorf, Erkrath, Hilden, Ratingen, Neuss, Krefeld, Kaarst, Korschenbroich, Haan, Grevenbroich, Langenfeld, Meerbusch, Monheim, Rommerskirchen, Dormagen, Willich.
Frankfurt: Coverage includes in the entire Frankfurt region, bounded by Butzbach (Wetterau-Kreis) in the north, by Aschaffenburg in the east, by Bensheim/Heppenheim (Kreis Bergstraße) in the South and by Wiesbaden and Mainz in the West.
Hamburg: Coverage includes Hamburg and four surrounding submarkets: North limited by Norderstedt, Quickborn, Kaltenkirchen, Henstedt-Ulzburg; East limited by Bargteheide, Ahrensburg, Trittau, Schwarzenbek, Geesthacht; South limited by Lüneburg, Winsen (Luhe), Buchholz, Buxtehude; West limited by Wedel, Uetersen-Tornesch.
Cologne: The considered market area comprises the cities and communities Cologne, Leverkusen, Bergisch Gladbach, Rösrath, Troisdorf, Niederkassel, Wesseling, Brühl, Hürth, Frechen, Pulheim, Bedburg, Bergheim, Elsdorf, Kerpen, Erfstadt, Weilerswist, Leichlingen, Burscheid and Odenthal. only space ≥ 5,000 sqm
Munich: Coverage includes the entire Munich region. In addition to the City of Munich itself, the region surveyed comprises the most important towns and local authorities in the immediate vicinity of the administrative districts of Dachau, Ebersberg, Erding, Freising, Fürstenfeldbruck and Munich as well as Starnberg.
Ruhr Area: The considered market area comprises the cities Bochum, Bottrop, Dortmund, Duisburg, Essen, Gelsenkirchen, Hagen, Hamm, Herne, Mülheim and Oberhausen as well as the administrative districts Recklinghausen, Wesel, Unna and Ennepe-Ruhr-Kreis. only space ≥ 5,000 sqm.