{"nrhp_refnum":"92001562","name":"Hopson-Swan Estate","other_names":["See Also:Palisades Interstate Park NHS"],"category":"district","location":{"address":"US 9W E of Sparkill, Tallman Mountain State Park","address_restricted":false,"city":"Sparkill","county":"Rockland County","state":"NY","lat":41.027027187000044,"lon":-73.91608216599997,"geom_source":"nps_gis"},"listed_date":"1992-11-23","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"A one-and-one-half story frame house with three outbuildings and a landscaped site of about eight acres on Rte. 9W near Sparkill, Rockland County, New York, built c1850 and enlarged c1869 and c1920. It lies within Tallman Mountain State Park.","why_significant":"The nomination argues the estate is a distinctive, intact example of a small picturesque suburban residence of the mid-nineteenth century in southeastern Rockland County. Its original plan closely resembles one in A.J. Downing's Cottage Residences (1842), and later phases reflect Victorian and early twentieth-century country-house tastes. The grounds retain landscape features from both major periods of occupation.","narrative":"Set well back from Route 9W near Sparkill, this one-and-one-half story clapboard house sits on a stone foundation under a mansard roof, at the end of a long tree-lined drive bordered by stone walls. Built around 1850 for Dr. James A. Hopson and Eliza Ann Clark Hopson, it closely follows a plan published in A.J. Downing's Cottage Residences of 1842, suggesting a pattern-book design adapted by a builder. Around 1869 the Hopsons added a tower, mansard roof and dormers and moved the stair to the rear of the parlor. After Marion B. Swan acquired the property in 1920, a screened porch, French doors, classical columns, servants' quarters and carriage houses were added, turning the family home into a country seat. The Palisades Interstate Park Commission acquired it in 1947. The roughly eight-acre site, with a cast-iron gazebo, carriage houses and mature plantings, was listed for its architecture as an intact picturesque suburban residence.","period_of_significance":"c1850-c1940","architect_builder":null,"architectural_style":"Mid-19th century; Late Victorian","criteria":["C"],"status_note":"Described as in excellent condition with minor alterations; used as a single dwelling and owned by the Palisades Interstate Park Commission since 1947.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:45.476649-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/92001562.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/92001562/fd0279f260-800.webp","url_1600":"https://nationalhistoricalregister.com/media/92001562/fd0279f260-1600.webp","licence":"CC BY-SA 4.0","author":"JERRYE &amp; ROY KLOTZ, M.D.","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:1HOPSON-SWAN_ESTATE,_SPARKILL,_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:1HOPSON-SWAN_ESTATE,_SPARKILL,_ROCKLAND_COUNTY,_NY.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75321456","wikipedia":"https://en.wikipedia.org/wiki/Hopson-Swan_Estate","wikidata":"https://www.wikidata.org/wiki/Q5901328"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/rockland-county/hopson-swan-estate-92001562/"}