Conservation covenants in Castlecrag, Sydney: Walter Burley and Marion Griffin’s legal innovation in the interbellum

Castlecrag, NSW, in the 1920s and 1930s, hosted a pioneering effort in nature conservation through covenants, a private legal mechanism to control land use. The legal innovation in Castlecrag is additionally noteworthy for the precocious leadership of American architects Walter Burley Griffin and Marion Mahony Griffin in designing this 'garden estate', which represents one of their most significant contributions to land use planning in Australia outside of Canberra. Their experiment utilised a legal mechanism developed in the United Kingdom and the United States, which they sought to adapt to Australian conditions. Their conservation covenants in Castlecrag encountered many legal, financial and practical difficulties; yet the Griffins' experiment offers valuable insights into how private landholders could influence nature conservation in an era before environmental and planning laws were well established.