Rancho Milpitas was a 43,281-acre (175.15 km2) Mexican land grant in present-day Monterey County, California given in 1838 by governor Juan Alvarado to Ygnacio Pastor.
Ygnacio Pastor, a neophyte of the San Antonio Mission, received the grant of Rancho Milpitas from Governor Alvarado in 1838.
[3] 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.
[6] Faxon Atherton[7] purchased Rancho Milpitas from Ygnacio Pastor immediately upon its title clearance in 1875.
William Randolph Hearst's Piedmont Land and Cattle Company acquired the rancho in 1925.