{"nrhp_refnum":"75000478","name":"Carolands, The","other_names":["The Chateau"],"category":"building","location":{"address":"565 Remillard Dr.","address_restricted":false,"city":"Hillsborough","county":"San Mateo County","state":"CA","lat":37.55543589400003,"lon":-122.37183203199999,"geom_source":"nps_gis"},"listed_date":"1975-10-21","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture"],"significance_levels":["national"],"summary":{"what_it_is":"A large French Classical style chateau of reinforced concrete at 565 Remillard Drive in Hillsborough, San Mateo County, California, constructed in 1914-15 for Harriet Pullman Carolan.","why_significant":"The nomination argues the building is one of the purest examples of French Classical architecture in America and reflects the aspirations of wealthy Americans who recreated European aristocratic surroundings. It was designed by Parisian architect Ernest Sanson with Willis Polk as local supervising architect. It is also among the earliest examples of domestic architecture built of reinforced concrete.","narrative":"Rising on a ridge west of Burlingame, this five-storey chateau in Hillsborough, California, was built in 1914-15 for Harriet Pullman Carolan, heiress to the Pullman fortune. Parisian architect Ernest Sanson designed it, with Willis Polk supervising locally. Its reinforced concrete walls are scored to resemble ashlar masonry, and a copper mansard roof caps the facades. The house holds roughly 110 rooms arranged around a skylit, columned central court with a grand double stair. Rooms include a library, ballroom, and a set of salons with imported French paneling, plus a hidden mezzanine and an extensive basement kitchen lit by a moat. The nomination describes the house as remarkably unaltered. It is considered one of the purest American examples of French Classical architecture, drawing on 17th-century chateaux near Paris, and one of the earliest domestic buildings in reinforced concrete. It also illustrates the ambitions of wealthy American society in the early twentieth century.","period_of_significance":"1900-","architect_builder":"Ernest Sanson and Willis Polk","architectural_style":"French Classical / Beaux Arts","criteria":[],"status_note":"Described as in excellent condition and virtually unaltered; the form lists ownership as private, in probate, with exterior visual access only.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:31.98461-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_CA/75000478.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/75000478/127d2448d3-800.webp","url_1600":"https://nationalhistoricalregister.com/media/75000478/127d2448d3-1600.webp","licence":"CC BY 3.0","author":"Gary gary gary at en.wikipedia","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Carolands_Chateau.jpg\" rel=\"noopener\">Gary gary gary at en.wikipedia</a>, <a href=\"https://creativecommons.org/licenses/by/3.0\" rel=\"license noopener\">CC BY 3.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Carolands_Chateau.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/123861494","wikipedia":"https://en.wikipedia.org/wiki/Carolands","wikidata":"https://www.wikidata.org/wiki/Q5044648"},"indexable":true,"url":"https://nationalhistoricalregister.com/california/san-mateo-county/carolands-the-75000478/"}