{"nrhp_refnum":"11000292","name":"Ferdon, William, House","other_names":["Ferdon Hall"],"category":"building","location":{"address":"270 Ferdon Ave.","address_restricted":false,"city":"Piermont","county":"Rockland County","state":"NY","lat":41.03493000000003,"lon":-73.91891999999996,"geom_source":"nps_gis"},"listed_date":"2011-05-18","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture","Industry"],"significance_levels":["local"],"summary":{"what_it_is":"A large Greek Revival frame house at 270 Ferdon Avenue in Piermont, Rockland County, New York, built around 1835 for William Ferdon and known as Ferdon Hall. It has a monumental six-column portico facing Ferdon Avenue and the Sparkill Creek.","why_significant":"The nomination presents the house as an ambitious example of Greek Revival domestic design in Rockland County, built when the style was only beginning to influence the area. It is also tied to William Ferdon's woolen mill business on the Sparkill Creek, which is why industry is listed as an area of significance. The original 1830s plan and finishes remain largely intact despite later additions.","narrative":"Ferdon Hall, at 270 Ferdon Avenue in Piermont, Rockland County, is a large frame house built around 1835 for William Ferdon. Its two-story main block sits above a high sandstone basement and is fronted by a monumental portico of six fluted Ionic columns, facing the Sparkill Creek where Ferdon's woolen mill once operated. Inside, a center-hall plan, a cantilevered staircase, sliding parlor doors, plaster cornices and ceiling medallions survive as examples of Greek Revival finish work. Later changes include a 1920s addition, since removed, and new two-tier flanker wings and a rear verandah that leave the original block largely intact. The house is significant for its architecture and for its link to local industry. It was built when Rockland County still favored conservative building traditions, and its scale and temple-front form would have stood out among Piermont's simpler frame, brick and sandstone homes. It remains a private residence.","period_of_significance":"C. 1835-1872","architect_builder":null,"architectural_style":"Mid-19th Century: Greek Revival","criteria":["A","C"],"status_note":"Currently used as a single dwelling. Early twentieth-century additions were removed and replaced with new flanker wings and a rear verandah; the woolen mill is no longer standing.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:47.840677-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/11000292.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/11000292/af9516d96d-800.webp","url_1600":"https://nationalhistoricalregister.com/media/11000292/af9516d96d-1600.webp","licence":"CC BY-SA 4.0","author":"JERRYE &amp; ROY KLOTZ, M.D.","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:WILLIAM_FERDON_HOUSE,_PIERMONT,_ROCKLAND_COUNTY_NY.jpg\" rel=\"noopener\">JERRYE &amp;amp; ROY KLOTZ, M.D.</a>, <a href=\"https://creativecommons.org/licenses/by-sa/4.0\" rel=\"license noopener\">CC BY-SA 4.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:WILLIAM_FERDON_HOUSE,_PIERMONT,_ROCKLAND_COUNTY_NY.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75321442","wikipedia":"https://en.wikipedia.org/wiki/William_Ferdon_House","wikidata":"https://www.wikidata.org/wiki/Q23091520"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/rockland-county/ferdon-william-house-11000292/"}