Zehlendorf is a locality within the borough of Steglitz-Zehlendorf in Berlin. Before Berlin's 2001 administrative reform Zehlendorf was a borough in its own right, consisting of the locality of Zehlendorf as well as Wannsee, Nikolassee and Dahlem. Zehlendorf contains some of the most remarked upon natural settings in Berlin, including parts of the Grunewald forest and the Schlachtensee and Krumme Lanke lakes. Additionally, it has large affluent residential neighborhoods, some with cobblestone streets and buildings that are over 100 years old. It is one of the most expensive areas in Berlin for housing.