Jensen, Cornelius, Ranch
Why it's listed
Begun in 1868, this red brick ranch house in Rubidoux, Riverside County, was built by Danish-born sea captain and rancher Cornelius Jensen. It stood at the center of a 1400-acre ranch where he raised grapes, olives, citrus, grain, horses and cattle. The house has 13-inch brick walls, a gabled shingle roof, three chimneys and a double row of rooms, with late Colonial detailing that was uncommon in California. A brick winery and milk house from the same period survive nearby. The house is described as the first colonial-style house in the area and the oldest occupied residence in present Riverside County. Jensen also made loans to neighbors, helped defend local settlers' land claims and served on the county board of supervisors from 1861 until 1886. The land descends from the Rancho Jurupa grant. Descendants have held what remains of the property, about 53 acres, for over a century.
Significance in brief: The nomination argues that Jensen, a Danish immigrant, became a major figure in local agriculture, commerce and politics. His house was the first colonial-style house in the area and the oldest occupied residence in present Riverside County. The ranch is the remaining core of an original 1400-acre holding that traces back to the Mexican land-grant era. It also includes some of the earliest citrus plantings in the county.
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 79000519, listed September 6, 1979. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence medium).
Key facts
| Address | 4350 Riverview Dr, Rubidoux |
|---|---|
| County | Riverside County |
| Listed | September 6, 1979 |
| Reference number | 79000519 |
| Resource type | Building |
| Period of significance | 1868- |
| Architect / builder | Cornelius Jensen |
| Architectural style | Late Colonial / Classical styling, described in the review notes as a vernacular house with Scandinavian-derived design |
| Areas of significance | Agriculture, Exploration/Settlement, Politics/Government, Architecture |
| Level of significance | Local |
| Status (as stated in the nomination) | The house is described as an occupied residence still held by descendants; the remaining land is used mainly for grazing a small number of cattle. The form notes a possible threat of sale and a county parks proposal to acquire and restore it. |
| Acreage | 53.7 |
| Coordinates | 33.99262, -117.41783 (NPS GIS) |
What listing means for this property
National Register listing is honorary: it recognises significance and does not restrict what a private owner may do without federal money or permits. It unlocks the 20% federal rehabilitation tax credit for income-producing buildings, state credits in many states, and Section 106 review when federal agencies are involved. See what listing means in practice.
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 79000519.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q14682511
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.