Rancho Las Positas

Rancho Las Positas was a 8,880-acre (35.9 km2) Mexican land grant in present-day Alameda County, California given in 1839 by governor Juan Alvarado to Robert Livermore and José Noriega.

[2][3] In 1834 Livermore and his business partner José Noriega were keeping livestock at Rancho Las Positas, where they also built an adobe.

Initially an adobe structure built by Livermore and Amador served as their house on the rancho.

[4] 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.

[8] When Livermore died in 1858, before the establishment of the town that bears his name, he left behind Josefa and eight children.

Don José Noriega was granted Rancho Las Positas, in conjunction with Robert Livermore, in 1839.
Robert Livermore , also known as Don Roberto Livermore, was granted Rancho Las Positas, in conjunction with José Noriega, in 1839
Alameda County map