Grunewal (Greenwood) is both a forest in Berlin on the east side of the Havel and a locality of the Berlin borough of Charlottenburg-Wilmersdorf. While the name derives from the Grunewald hunting lodge of 1543, the neighbourhood developed out of a so-called "mansion colony" at the western end of the Kurfürstendamm. Promoted by Otto von Bismarck the upper class of Berlin from 1880 on discovered Grunewald as an attractive site for living. Today, the social structure of Grunewald is still influenced by these origins. The Rot-Weiss Tennis Club, home of the WTA Tour German Open, has been located in the district since 1897.