Before revision: Consequences of the Permanent Forest Contract today 240x240px|Acquisition: Tegel Forest; here with Tegeler Fließ Through the purchases of the Association, smaller ones made in parallel by the city of Berlin, and other acquisitions, after it was founded in 1920 Greater Berlin owned in total 21,500 hectares of forest, and by the beginning of World War II this area had grown to around 25,000 hectares.
After revision: ,Consequences of the Permanent Forest Contract today 240x240px|Acquisition: Tegel Forest; here with Tegeler Fließ Through the purchases of the Association, smaller ones made in parallel by the city of Berlin, and other acquisitions, after it was founded in 1920 Greater Berlin owned in total 21,500 hectares of forest, and by the beginning of World War II this area had grown to around 25,000 hectares.