{"nrhp_refnum":"70000151","name":"Petaluma Adobe","other_names":["Rancho Petaluma Adobe","Rancho Petaluma"],"category":"building","location":{"address":"4 mi. E of Petaluma on Casa Grande Rd.","address_restricted":false,"city":"Petaluma","county":"Sonoma County","state":"CA","lat":38.25619328500005,"lon":-122.58483191295292,"geom_source":"nps_gis"},"listed_date":"1970-04-15","is_nhl":true,"nhl_designated_date":"1970-04-15","areas_of_significance":["Agriculture","Exploration/Settlement","Architecture"],"significance_levels":["national"],"summary":{"what_it_is":"Rancho Petaluma Adobe is the two-story headquarters building of the former 67,000-acre Rancho Petaluma, on Adobe Road about 4 miles east of Petaluma, Sonoma County, California. It was built between 1835 and 1844 by Salvador Vallejo for his brother, General Mariano Guadalupe Vallejo.","why_significant":"The nomination calls it the largest existing adobe structure in California. It is a notable example of Monterey Colonial architecture and a surviving centre of the Spanish and Mexican-era cattle rancho economy. It was recommended as nationally significant within the Colonial Architecture and Spanish Exploration and Settlement themes.","narrative":"Rancho Petaluma Adobe, about four miles east of Petaluma in Sonoma County, served as the headquarters of a 67,000-acre rancho. Salvador Vallejo built it between 1835 and 1844 for his older brother, General Mariano Guadalupe Vallejo. The two-story Monterey Colonial house follows a U-shaped plan around three sides of a courtyard measuring 200 by 145 feet; a fourth wing was never fully completed. Its walls are three feet thick and 20 feet high, set on native field stone foundations. A broad two-story veranda ran around the interior and exterior, and iron grills and wooden shutters covered the openings. Living quarters were on the upper floor, with storerooms and workshops below. Redwood timbers were hauled by oxen from forests about 50 miles north, and Indian laborers made the adobe bricks on site. It is described as the largest surviving adobe structure in California. After falling into poor repair by 1910, it became a state historical monument in 1951 and has since been restored as a state park museum.","period_of_significance":null,"architect_builder":"Salvador Vallejo, built for General Mariano Guadalupe Vallejo","architectural_style":"Monterey Colonial","criteria":[],"status_note":"Restored and in excellent condition; used as a state park. It became a California State Historical Monument in 1951 and was being repaired and reconstructed.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:32.158062-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_CA/70000151_NHL.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/70000151/ec6a6323db-800.webp","url_1600":"https://nationalhistoricalregister.com/media/70000151/ec6a6323db-1600.webp","licence":"Public domain","author":null,"credit_html":"Unknown author, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Historic_American_Buildings_Survey_Roger_Sturtevant,_Photographer_Feb._11,_1934_VIEW_FROM_SOUTH-EAST_-_Vallejo_Adobe,_Adobe_Road_at_Casa_Grande,_Petaluma,_Sonoma_County,_CA_HABS_CAL,49-PET.V,1-3.tif"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/123858121","wikipedia":"https://en.wikipedia.org/wiki/Rancho_Petaluma_Adobe","wikidata":"https://www.wikidata.org/wiki/Q7291163"},"indexable":true,"url":"https://nationalhistoricalregister.com/california/sonoma-county/petaluma-adobe-70000151/"}