A well developed, collaborative, and open planning and partnership process has brought us to this point, starting in 1972 with the Nixon administration. The three main entities are summarized here.
https://www.nps.gov/goga/learn/news/...eld-begins.htm
The Golden Gate National Recreation Area covers 82,791 acres in Marin, San Francisco, and San Mateo counties, so it extends well beyond the Presidio.