Hawkins-Nimocks Estate-Patricio Ontiveros Adobe
Also known as: Slusher Estate
Why it's listed
Two layers of Southern California history sit on this Santa Fe Springs property. The earlier is the Patricio Ontiveros Adobe, a three-room structure about 30 meters long whose cobble and boulder foundations survive. Probably occupied by the Ontiveros family between 1811 and 1814, it was linked to Mission San Juan Capistrano and abandoned after the family left in 1834-1835. Excavations recovered large amounts of cattle bone, Tizon Brown pottery, Majolica and Chinese ceramics, giving evidence of butchering, trade and diet. The later layer is the Hawkins-Nimocks Estate, a garden ranch begun in the 1880s on land once owned by J.E. Fulton, founder of Fulton Wells. It retains concrete fountains, urns and planters, a trellis, a tank house and aged carob trees whose cuttings helped start the commercial carob industry. Together they show settlement from the Mission era to the early twentieth century.
Significance in brief: The adobe foundations are unusually large and sit in an area not disturbed by modern urban growth, so the buried deposits can yield data on early Southern California life, trade and Mission-related industry. The later estate, linked to early settler J.E. Fulton, was one of the first and most extensive garden ranches in Los Angeles County, with early decorative concrete work and carob trees important to the carob industry.
Machine-generated summary. This summary was generated by a language model from the official nomination document and has not been reviewed line by line by an editor. It may contain errors. Check the source document before relying on any detail. Source: nomination document (PDF) · National Archives catalog entry. NRHP reference 82004982, listed December 31, 1987. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence medium).
Key facts
| Address | 12100 Telegraph Rd., Santa Fe Springs |
|---|---|
| County | Los Angeles County |
| Listed | December 31, 1987 |
| Reference number | 82004982 |
| Resource type | District |
| Period of significance | 1809-1920's |
| Areas of significance | Historic - Non-Aboriginal, Exploration/Settlement, Architecture |
| Level of significance | State |
| Status (as stated in the nomination) | Adobe survives as intact foundations (ruins); estate buildings are in fair condition, ranging from good to deteriorated, and the property is held in trust. |
| Acreage | 6.7 |
| Coordinates | 33.93942, -118.07710 (NPS GIS) |
What listing means for this property
This is a historic district. Buildings within its boundary are either contributing (they add to the district's significance) or non-contributing. Owners of contributing income-producing buildings can claim the 20% federal rehabilitation tax credit; homeowners should look at state credits. National Register districts impose no design review by themselves; a local historic district ordinance, if one exists, does (the difference explained).
General information, not legal or tax advice. Rules change; confirm with your State Historic Preservation Office or a qualified adviser.
Sources and further reading
- National Park Service, National Register of Historic Places database (snapshot May 2026), reference 82004982.
- Nomination form (PDF, National Archives) — catalog entry
- Wikidata Q59315139
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.