Rancho San Miguel was a 6,663-acre (26.96 km2) Mexican land grant in present-day Sonoma County, California given in 1840 by Governor Juan B. Alvarado to William Marcus West.
[2][3] William Mark West (d.1849), a Scot, came to Sonoma in 1832, soon after marrying Guadalupe Vasquez, a niece of General Vallejo in Santa Cruz, Mexico.
A claim for Rancho San Miguel was filed with the Public Land Commission in 1852.
[6][7] The claim for six square leagues was rejected by the Land Commission in 1855, but confirmed by the US District Court in 1857.
The Supreme Court accepted one and a half square leagues,[8] and the grant was patented to Guadalupe Vasquez de West in 1865.