The Permanent Forest Contract (in German Dauerwaldvertrag, also Dauerwaldkaufvertrag or Jahrhundertvertrag) refers to an agreement from 27 March 1915 for the communal Association of Greater Berlin (German: Zweckverband Groß-Berlin) to buy areas of forest from the state of Prussia. The modern city of Berlin developed out of the association five years later and became its legal successor in the contract. This contract created the conditions for "Berlin to be provided with – compared to other major cities – uniquely extensive areas of forest."[1]