Woodacre Forest Knolls Rancho San Geronimo was a 8,701-acre (35.21 km2) Mexican land grant in present-day Marin County, California given in 1844 by Governor Manuel Micheltorena to Rafael Cacho.

With the cession of California to the United States following the Mexican-American War, the 1848 Treaty of Guadalupe Hidalgo provided that the land grants would be honored.

[9] On December 28, 1849, Price paid Revere $7,500 to purchase half the land, with $2,500 up front (the deadline for the remaining expenses being January 1, 1851).

A demographic shift occurred a decade later, wherein "an exodus of progressive young people from San Francisco changed the character of the area once again.

"[5] Nevertheless, as of 2021, the San Geronimo Valley Historical Society claims the Rancho "has managed to maintain its rural character, despite many threats of major development.

[16] In 2020, the SGVHS began an oral history project, conducting monthly interviews with longtime Valley residents, supported by the Marin County Free Library.