Rancho Los Nogales was a 1,004-acre (4.06 km2) Mexican land grant in present-day Los Angeles County, California given in 1840 by Governor Juan Alvarado to Jose de la Luz Linares.[1] The name means "Ranch of the Walnut Trees" in Spanish. The triangular-shaped land grant between San Jose Creek and Diamond Bar Creek included parts of present-day Walnut and Diamond Bar.[2][3]