{"nrhp_refnum":"07001351","name":"Hagemann Ranch Historic District","other_names":["Mendenhall Farm","Hagemann Farm"],"category":"district","location":{"address":"455 Olivina Ave.","address_restricted":false,"city":"Livermore","county":"Alameda County","state":"CA","lat":37.68166317500004,"lon":-121.79760762399997,"geom_source":"nps_gis"},"listed_date":"2008-01-10","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture","Agriculture"],"significance_levels":["local"],"summary":{"what_it_is":"A five-acre historic farmstead at 455 Olivina Avenue, Livermore, California, with a vernacular farmhouse begun around 1870 and eleven related outbuildings and structures along a central farm lane.","why_significant":"The nomination argues the district embodies the agricultural activity of the Livermore Valley in the late 19th and early 20th centuries. It qualifies under Criterion C at the local level as a distinctive farm type, with a vernacular farmhouse expanded in stages and a largely intact group of farm outbuildings. The central lane, mature oaks and eucalyptus preserve the feeling of a 19th-century farm despite surrounding suburban development.","narrative":"Hagemann Ranch is a five-acre farmstead on Olivina Avenue in Livermore, about a mile and a half west of downtown and now surrounded by suburban housing. Its single-story wood-frame farmhouse likely began as a cabin built around 1870 by Martin Mendenhall, and it grew in phases under Mendenhall and later the Hagemann family, with additions in 1910, 1920 and 1948. Eleven outbuildings and structures line a central east-west farm lane, including horse and cow barns, a blacksmith shop, a granary, chicken coops, a garage and a windmill pump house. Mature oaks and eucalyptus trees add to the setting. The property is significant for representing the farming life of the Livermore Valley from 1870 to 1930. It is recognized for architecture as a collection of vernacular farm buildings that remain largely intact, and it conveys a strong sense of nineteenth-century agriculture despite the loss of most of its original acreage.","period_of_significance":"1870-1930","architect_builder":null,"architectural_style":"19th century folk farmhouse; agricultural outbuildings (Vernacular)","criteria":["C"],"status_note":"The farmhouse is described as in good condition with few alterations since 1920; outbuildings range from good to poor condition. Historic and current functions are domestic and agricultural.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:54:29.59517-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_CA/07001351.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/07001351/3094430bda-800.webp","url_1600":"https://nationalhistoricalregister.com/media/07001351/3094430bda-1600.webp","licence":"CC BY-SA 3.0","author":"Sanfranman59","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Hagemann_Ranch_(Livermore,_CA).JPG\" rel=\"noopener\">Sanfranman59</a>, <a href=\"https://creativecommons.org/licenses/by-sa/3.0\" rel=\"license noopener\">CC BY-SA 3.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Hagemann_Ranch_(Livermore,_CA).JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/123858236","wikipedia":"https://en.wikipedia.org/wiki/Hagemann_Ranch_Historic_District","wikidata":"https://www.wikidata.org/wiki/Q122391517"},"indexable":true,"url":"https://nationalhistoricalregister.com/california/alameda-county/hagemann-ranch-historic-district-07001351/"}