Rancho Petaluma Adobe, Petaluma: In 1910, Native Sons of the Golden West, Petaluma Parlor #27 purchased what remained of General Mariano G. Vallejo’s vast adobe ranch house. Over half of the building had succumbed to neglect and the forces of nature. In 1932 it was registered as California State Historical Landmark #18. After years of work and fundraising, the fully restored historic site was turned over to the State of California in 1951.