{"nrhp_refnum":"79000519","name":"Jensen, Cornelius, Ranch","other_names":[],"category":"building","location":{"address":"4350 Riverview Dr","address_restricted":false,"city":"Rubidoux","county":"Riverside County","state":"CA","lat":33.99262000500005,"lon":-117.41783163711418,"geom_source":"nps_gis"},"listed_date":"1979-09-06","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Agriculture","Exploration/Settlement","Politics/Government","Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"A ranch complex centered on a red brick house begun in 1868 by Cornelius Jensen at 4350 Riverview Drive, Rubidoux, Riverside County, California. It also includes a brick winery, a brick milk house and sheds.","why_significant":"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.","narrative":"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.","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","criteria":[],"status_note":"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.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:31.737951-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_CA/79000519.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/79000519/29b2504e30-800.webp","url_1600":"https://nationalhistoricalregister.com/media/79000519/29b2504e30-1600.webp","licence":"Public domain","author":"Jensen Alvarado (Life time: 1870)","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:JensenAlvaradoRanch1870.jpg\" rel=\"noopener\">Jensen Alvarado (Life time: 1870)</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:JensenAlvaradoRanch1870.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/123860480","wikipedia":"https://en.wikipedia.org/wiki/Jensen_Alvarado_Ranch","wikidata":"https://www.wikidata.org/wiki/Q14682511"},"indexable":true,"url":"https://nationalhistoricalregister.com/california/riverside-county/jensen-cornelius-ranch-79000519/"}