Rancho Topanga Malibu Sequit was a 13,316-acre (53.89 km2) Spanish land grant in the Santa Monica Mountains and adjacent coast, within present day Los Angeles County, California. It was given by Spanish Governor José Joaquín de Arrillaga in 1804 to José Bartolomé Tapia.
The present day communities of Malibu and western Topanga are located on parts of the former rancho.
José Bartolomé Tapia was the eldest of nine children of Felipe Santiago Tapia, a soldier in the De Anza Expedition of 1775. In 1800, José Bartolomé Tapia applied, as a reward for his own Army service, for a grant of the land he saw as a youth. The grant was made in 1804, and Tapia settled on the land, to graze his cattle and raise his family.
In 1848 Tapia's widow (Maria Francisca Mauricia Villalobo) sold the rancho to her grandson-in-law, Leon Victor Prudhomme who had married a daughter of Tiburcio Tapia, grantee of Rancho Cucamonga.
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. As required by the Land Act of 1851, Prudhomme filed a claim for Rancho Topanga Malibu Sequit but could not document the Tapia title and the claim was rejected. In 1857 he sold his undefined interest in the land to Irishman Matthew (Mateo) Keller (1811-1881). Keller was able to perfect his claim to the land, and receive a patent in 1872.
Eleven years after Keller's death, the rancho was sold to Boston and Los Angeles businessman and philanthropist Frederick Hastings Rindge in 1891.
Historic sites of the Rancho
- Felipe Santiago Tapia (1745–1811), soldier in the de Anza Expedition. Tapia Drive in San Francisco's Parkmerced is named for him. The nearby Cardenas Avenue is named for his wife. 
- Jose Bartolome Tapia (1766–1824), son of Felipe Santiago Tapia, eldest of nine children, grantee of Rancho Topanga Malibu Sequit.
- Tiburcio Tapia (1789–1845), son of Jose Bartolome Tapia, grantee of Rancho Cucamonga, Mayor of Los Angeles 1830, 1839 and 1840. Married María Tomasa Valdéz.
- Maria Merced Tapia de Prudhomme, daughter of Tiburcio Tapia, married Leon Victor Prudhomme.
- ^ Ogden Hoffman, 1862, Reports of Land Cases Determined in the United States District Court for the Northern District of California, Numa Hubert, San Francisco
- ^ Malibu History Archived February 20, 2008, at the Wayback Machine
- ^ United States. District Court (California : Southern District) Land Case 147 SD
- ^ An Illustrated History of Los Angeles County, California, 1889 ,Lewis Publishing Company, Chicago
- ^ Report of the Surveyor General 1844-1886 Archived 2014-07-26 at the Wayback Machine
- ^ Malibu History Archived May 12, 2010, at the Wayback Machine
- ^ Adamson House Archived May 17, 2014, at the Wayback Machine
- ^ Anza Expedition Roll Call Archived February 17, 2012, at the Wayback Machine
- ^ Soldiers Of The De Anza 1775 Expedition Archived August 24, 2013, at the Wayback Machine
- ^ The Chronicle 12 April 1987 p.7
Coordinates: 34°03?00?N 118°41?24?W / 34.050°N 118.690°W