Rancho Santa Rita was a 8,894-acre (35.99 km2) Mexican land grant in the Amador Valley and western Livermore Valley, which is in present day Alameda County, California.
It was given in 1839 by Governor Juan Alvarado to Jose Dolores Pacheco. 
The rancho included present day Pleasanton, Asco, and Dougherty.   
Rancho Santa Rita was granted in 1839 to Pueblo de San José alcalde Jose Dolores Pacheco. It extended east from present day Foothill Road, with the Rancho Las Positas adjacent in the eastern Livermore Valley, Rancho San Ramon on the north and the Rancho Valle de San Jose on the south, Pacheco was an absentee landowner, but had a small adobe built in 1844, which is no longer standing. In 1854, Francisco Alviso, the son of Pacheco's majordomo (ranch manager), Francisco Solano Alviso, built the adobe ranch house that still stands on Foothill Road in the Alviso Adobe Community Park overlooking Amador Valley.
A claim for Rancho Santa Rita was filed with the Public Land Commission in 1852, and the grant was patented to John Yountz, administrator of the estate of José Dolores Pacheco in 1865.   
In 1853, Rancho Santa Rita was sold to Augustin Alviso, grantee of Rancho Potrero de los Cerritos, by the heirs of Jose Delores Pacheco, Juana Pacheco and Salvio Pacheco.  In 1854, Samuel B. Martin and West J. Martin purchased Rancho Santa Rita. They sold the ranch in 1865, and moved to Oakland. 
In 1865 William M. Mendenhall came to the valley, and in 1868 purchased 650 acres (2.6 km2) of the Rancho Santa Rita grant. During the period of the railroad boom in the late 1860s, Rancho Santa Rita was sub divided into fifteen farms. The farms were "small" tracts of about 300 acres (1.2 km2) to 3,750 acres (15.2 km2). The larger land owners consisted of J.W. Dougherty, 750 acres (3.0 km2); Abdijah Baker, 2,078 acres (8.4 km2); and William Knox, 360 acres (1.5 km2).
In 1869 J.W. Kottinger and J.A. Neal each laid out and plotted a subdivision for a new town called Alisal, situated about five miles south of Dublin. By 1878 the village was an unincorporated town of about 500 people, later renamed Pleasanton. Like Livermore, Pleasanton attained its size and importance with coming of the Union Pacific Railroad.
In the early 1880s, Count Valensin purchased 140 acres (0.6 km2), Maas Suders purchased a strip of land from the Mendenhall's 650 acres (2.6 km2), and Samuel Hewlett purchased 1,600 acres (6.5 km2). In 1894 the remainder of Rancho Santa Rita was offered for sale by Lagrance and Company of Oakland.
In 1921 what was left of the Mexican grant was sold to Asa Mendenhall.  
Livermore is a city in Alameda County, California. With a 2020 population of 87,955, Livermore is the most populous city in the Tri-Valley. It is located on the eastern edge of California's San Francisco Bay Area. The current mayor is Bob Woerner.
Pleasanton is a city in Alameda County, California, United States. Located in the Amador Valley, it is a suburb in the East Bay region of the San Francisco Bay Area. The population was 79,871 at the 2020 census. In 2005 and 2007, Pleasanton was ranked the wealthiest middle-sized city in the United States by the Census Bureau. Pleasanton is home to the headquarters of Safeway, Workday, Ellie Mae, Roche Molecular Diagnostics, Blackhawk Network Holdings, and Veeva Systems. Other major employers include Kaiser Permanente, Oracle and Macy's. Although Oakland is the Alameda County seat, a few county offices are located in Pleasanton. The Alameda County Fairgrounds are located in Pleasanton, where the county fair is held during the last week of June and the first week of July. Pleasanton Ridge Regional Park is located on the west side of town.
Murray Township was a township located in what is now the Livermore Valley portion of Alameda County, California, including the present day cities of Livermore, Dublin, and Pleasanton, and the census-designated place of Sunol.
Robert Thomas Livermore, also known as Don Roberto Livermore, was an English-born Californian ranchero. He emigrated to Alta California in 1822, eventually becoming a Mexican citizen and a prominent landowner in the Bay Area. The city of Livermore, California is named for him.
Rancho Milpitas was a 4,458-acre (18.04 km2) Mexican land grant in Santa Clara County, California. The name comes from the Nahuatl word for maize and could be translated "little cornfields". The grant included what is now the city of Milpitas.
The Alviso Adobe Community Park is a 7-acre (2.8 ha) park in the city of Pleasanton, California, United States. It is built around an adobe house constructed in 1854 by Francisco Alviso on the Rancho Santa Rita Mexican Land Grant. The Alviso Adobe is a rare surviving example of an early American adobe that was continuously in use until 1969. The building is registered as California Historical Landmark #510 in 1954, but most of the historical marker was later found to be erroneous.
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. Las Positas means "little watering holes" in Spanish. The rancho included the present-day city of Livermore.
Rancho Monte del Diablo was a 17,921-acre (72.52 km2) Mexican land grant in present-day Contra Costa County, California given in 1834 by Governor José Figueroa to Salvio Pacheco. The name "Monte del Diablo" means "thicket of the devil" in Spanish. The name was later incorrectly translated as Mount Diablo. The grant covered the area from the Walnut Creek channel east to the hills, and generally from the Mount Diablo foothills north along Lime Ridge to Avon on the Carquinez Strait of the Sacramento River, and included present day Concord and parts of Pleasant Hill. Pacheco and Clayton are outside of the Rancho Monte del Diablo grant.
Rancho Cañada de los Vaqueros was a 17,760-acre (71.9 km2) Mexican land grant mostly in present day eastern Contra Costa County, California, and partially into northeastern Alameda County, California. Los Vaqueros Reservoir, located between Livermore and Brentwood in the Diablo Range, is on and named for the former rancho. Vasco Road passes through the site.
The Berryessa family is a prominent Californio family of Northern California. Members of the family held extensive rancho grants across the Bay Area during 18th and 19th centuries. Numerous places are named after the family, including the Berryessa district of San Jose and Lake Berryessa in Napa County.
Rancho Santa Teresa was a 9,647-acre (39.04 km2) Mexican land grant in present-day Santa Clara County, California given in 1834 by Governor José Figueroa to José Joaquín Bernal. The grant extended west from Coyote Creek to the Santa Teresa Hills, and included present-day Santa Teresa.
Rancho Valle de San José was a 48,436-acre (196.01 km2) Mexican land grant in present-day Alameda County, California. It was made up of the former pasture land belonging to Mission San José.
Rancho San Luis Gonzaga was a 48,821-acre (197.57 km2) Mexican land grant in the Diablo Range, in present-day Santa Clara County and Merced County, California given in 1843 by Governor Manuel Micheltorena to Juan Carlos Pacheco and José Maria Mejía. The grant was bounded by Francisco Pérez Pachecos Rancho Ausaymas y San Felipe on the west, the San Joaquin River and San Joaquin Valley on the east, and Los Baños Creek on the south.
Rancho Los Guilicos was a 18,834-acre (76.22 km2) Mexican land grant in present-day Sonoma County, California given in 1837 by Governor Juan B. Alvarado to John (Juan) Wilson. The grant extended along Sonoma Creek, south of Santa Rosa from Santa Rosa Creek south to almost Glen Ellen, and encompassed present day Oakmont, Kenwood and Annadel State Park.
Rancho La Natividad was a 8,642-acre (34.97 km2) Mexican land grant in present-day Monterey County, California given in 1837 by Governor Juan B. Alvarado to Manuel Butrón and his son-in-law, Nicolás Alviso. Rancho La Natividad and Rancho Los Vergeles were adjoining ranchos along Gabilan Creek north of present-day Salinas. The headquarters of each rancho were close to the entrance to the pass through the Gabilan Range to San Juan Bautista. The Rancho La Natividad grant encompassed present-day Natividad.
Rancho Potrero de los Cerritos was a 10,610-acre (42.9 km2) Mexican land grant in present day Alameda County, California given in 1844 by Governor Manuel Micheltorena to Augustin Alviso and Tomás Pacheco. The name means "pasture of the little hills" and included the Coyote Hills. The three square league grant, part of former Mission San José lands, encompassed present day Fremont, Alvarado, Centerville and Irvington.
Rancho San Luisito was a 4,389-acre (17.76 km2) Mexican land grant in present day San Luis Obispo County, California given in 1841 by Governor Juan B. Alvarado to José de Guadalupe Cantúa. The grant between Morro Bay and San Luis Obispo, extended along San Luisito Creek and Chorro Creek and encompassed Hollister Peak.
Rancho Cañada del Corral was a 8,876-acre (35.92 km2) Mexican land grant in present-day Santa Barbara County, California given in 1841 by Governor pro tem Manuel Jimeno to José Dolores Ortega. The name means "valley corral". The grant extended along the Pacific coast from José Francisco Ortega's Rancho Nuestra Señora del Refugio past El Capitán State Beach to Rancho Dos Pueblos, and extended up into the Santa Ynez Mountains along Corral Canyon and El Capitán Canyon.
Alisal, or El Alisal, was a Californio settlement located on the lands of the Rancho Santa Rita near the site of an Indian ranchera, around the Francisco Solano Alviso Adobe, called El Alisal, one of the earliest houses built in the Livermore Valley in 1844. Note that even though the database and plaque use the word "sycamore", the English translation of the Spanish "aliso" is "alder".
José María Amador was a Californio ranchero, gold miner, and soldier. Amador County and Amador City are both named after Amador, having found gold there in 1848. He is also the namesake of Amador Valley, a component of the Tri-Valley in Alameda County.
Coordinates: 37°40′12″N121°52′12″W / 37.670°N 121.870°W