Rancho La Merced was a 2,363-acre (9.56 km2) Mexican land grant in present day Los Angeles County, California given in 1844 by Governor Manuel Micheltorena to Casilda Soto de Lobo.
The northwest section of Montebello and the southeastern part of Monterey Park now occupy the area of what was Rancho La Merced.
[2][3][4] Governor Micheltorena granted Rancho La Merced to Casilda Soto de Lobo in 1844.
In 1851, Workman gave his son-in-law, Francisco P. Temple and former ranch foreman, Juan Matias Sanchez,[5] each an undivided half interest in Rancho La Merced.
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.