The Trustees of Reservations is a non-profit land conservation and historic preservation organization dedicated to preserving natural and historical places in the Commonwealth of Massachusetts. It is the oldest land conservation nonprofit organization of its kind in the world and has 140,000 dues-paying members as of 2018. In addition to land stewardship, the organization is also active in conservation partnerships, community supported agriculture (CSA), environmental and conservation education, community preservation and development, and green building. The Trustees of Reservations own title to 120 properties on 27,000 acres (11,000 ha) in Massachusetts, all of which are open to the public; it maintains conservation restrictions on over 200 additional properties. Properties include histor