{"nrhp_refnum":"03001401","name":"Harden, Edward, Mansion","other_names":["Broad Oaks"],"category":"building","location":{"address":"200 North Broadway","address_restricted":false,"city":"Sleepy Hollow","county":"Westchester County","state":"NY","lat":41.082849235000026,"lon":-73.85730790099996,"geom_source":"nps_gis"},"listed_date":"2004-01-16","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture","Education"],"significance_levels":["local"],"summary":{"what_it_is":"A large Georgian Revival brick mansion, originally called Broad Oaks, at 200 North Broadway in Sleepy Hollow, Westchester County, New York, built in 1909 for financier Edward Harden, with a c. 1880 carriage house on the grounds.","why_significant":"The nomination argues the house is an outstanding example of Georgian Revival residential architecture in Westchester County, designed by Hunt & Hunt. It also claims significance in education as the site of the first Montessori school in America, begun in 1911 with the Harden children among the first students.","narrative":"Broad Oaks, the Edward Harden Mansion, is a two-and-one-half story red brick Georgian Revival house on a hill above the Hudson River in Sleepy Hollow, New York. Built in 1909 and designed by Richard Howland Hunt and Joseph Howland Hunt of Hunt & Hunt, it has a symmetrical seven-bay façade, slate hip roof with dormers, marble trim, and two-story enclosed wood porches on its flanks. Inside, original black walnut woodwork, mantels and plaster detailing survive. A c. 1880 carriage house also remains on the site. Harden was a financier and former journalist known for sending news of Admiral Dewey's victory at Manila Bay. In 1911 part of the house hosted a Montessori kindergarten, described as the first in America. Later the building served as a home for retired seamstresses, then passed to the local board of education in 1955. It now houses the school district's offices. Its architecture and Montessori history underpin its listing.","period_of_significance":"c. 1880 - 1912","architect_builder":"Hunt & Hunt","architectural_style":"Late 19th & 20th Century Revivals: Georgian Revival","criteria":["A","C"],"status_note":"Converted from a home into offices and now serves as the administration building for the Union Free School District of the Tarrytowns; most original exterior and interior features remain intact.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:51:53.889235-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/03001401.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/03001401/d2ad954db3-800.webp","url_1600":"https://nationalhistoricalregister.com/media/03001401/d2ad954db3-1600.webp","licence":"CC BY-SA 3.0","author":"Daniel Case","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Edward_Harden_Mansion,_Sleepy_Hollow,_NY.jpg\" rel=\"noopener\">Daniel Case</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:Edward_Harden_Mansion,_Sleepy_Hollow,_NY.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75323047","wikipedia":"https://en.wikipedia.org/wiki/Edward_Harden_Mansion","wikidata":"https://www.wikidata.org/wiki/Q5343306"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/westchester-county/harden-edward-mansion-03001401/"}