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Rancho Los Alamos was a 48,803-acre (197.50 km2) Mexican land grant in present-day Santa Barbara County, California given in 1839 by Governor Juan Alvarado to José Antonio de la Guerra, a son of José de la Guerra y Noriega. Los Alamos is Spanish for "the cottonwoods" and describes Fremont Cottonwood (Populus fremontii) trees lining the banks of the San Antonio Creek.
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History
In 1839, during Mexico's rule of Alta California, Jose Antonio de la Guerra was granted title to Rancho Los Alamos in the Los Alamos Valley. Concepcion Ortega, who married Jose de la Guerra, came to live at the adobe ranch house.
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. As required by the Land Act of 1851, a claim for Rancho Los Alamos was filed with the Public Land Commission in 1852, and the land grant was patented to de la Guerra in 1872.
In 1876, San Francisco financier Thomas Bell along with his son John S. Bell, and James B. Shaw, purchased acreage from Rancho Los Alamos and the neighboring Rancho La Laguna. Both families allocated a half square mile from each of their new ranches to create the Los Alamos town site with "Centennial Street" as the central thoroughfare.