Mexican era thumb|left|1840 adobe home in Santa Monica In 1839, Governor Juan Bautista Alvarado granted Rancho San Vicente y Santa Mónica to Francisco Sepúlveda II, of the Sepúlveda family of California. As the definitions of the rancho grant were not precise, the Sepúlveda family came into conflict with the neighboring Rancho Boca de Santa Mónica, owned by Ysidro Reyes and Francisco Márquez. A small Californio community grew up on Rancho San Vicente y Santa Mónica, made up primarily of vaqueros working on the rancho and their families.
Mexican era thumb|left|1840 adobe home in Santa Monica In 1839 Governor Juan Bautista Alvarado granted Rancho San Vicente y Santa Mónica to Francisco Sepúlveda II of the Sepúlveda family of California As the definitions of the rancho grant were not precise the Sepúlveda family came into conflict with the neighboring Rancho Boca de Santa Mónica owned by Ysidro Reyes and Francisco Márquez A small Californio community grew up on Rancho San Vicente y Santa Mónica made up primarily of vaqueros working on the rancho and their families