Alongside his wine and restaurant activities, Richard Unger constructed an immense property business up to the start of World War I. After a short period of stagnation during the War, he sold products of his own manufacture under the brand name Kempinski. The business in Berlin flourished, so that in 1918 an impressive Kempinski hotel dependency was established at 27 Kurfürstendamm, where the Kempinski Hotel Bristol now stands. Ten years later, M. Kempinski & Co. took over the legendary “Haus Vaterland” on the Potsdamer Platz, where the firm exploited a concept that was unique in Berlin for a long time and is still known as “event gastronomy” (‘Erlebnisgastronomie’).