{"nrhp_refnum":"71000066","name":"Floyd, William, House","other_names":["Old Mastic House","Floyd,William,Estate"],"category":"building","location":{"address":"20 Washington Ave.","address_restricted":false,"city":"Mastic Beach","county":"Suffolk County","state":"NY","lat":40.76493822550003,"lon":-72.82319698636232,"geom_source":"nps_gis"},"listed_date":"1980-10-15","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Agriculture","Military","Politics/Government","Architecture"],"significance_levels":["national"],"summary":{"what_it_is":"A 25-room frame manor house with ten surviving outbuildings on the 611-acre William Floyd Estate at Mastic Beach, Long Island, New York. The oldest part dates to the 1720s, and the house was expanded in stages over about two and a half centuries.","why_significant":"The estate is tied to General William Floyd, born there in 1734, who signed the Declaration of Independence. It remained in the Floyd family for about 250 years, so many original features, furnishings and landscape elements survive. The house shows the continuous growth of a rural eighteenth-century manor house.","narrative":"Old Mastic, the William Floyd house, sits on Mastic Neck on Long Island's south shore, facing a broad lawn toward the bay. The oldest section was built in the 1720s, probably for Nicoll Floyd and his wife, and later owners added to it until it reached 25 rooms. Its seven-bay Georgian main block shows New England influence in its early framing, while later wings and porches reflect nineteenth-century and 1890s changes. William Floyd was born here in 1734 and went on to serve in the Continental Congress and sign the Declaration of Independence. His family fled when the British occupied Long Island, and he returned in 1783 to find the property damaged. The estate stayed with his descendants until 1975. Today it includes ten frame outbuildings, hedges and ditches marking old field boundaries, a family graveyard, and a row of crosses naming enslaved people. Original hardware, wallpaper, furniture and family papers also survive.","period_of_significance":"1700-1799, 1800-1899, 1900- (boxes checked); specific date 1724","architect_builder":"unknown","architectural_style":"Georgian to Colonial Revival (mixture of styles built in several stages)","criteria":[],"status_note":"Part of Fire Island National Seashore; the form says the house was not yet open to the public and descendants occupied the estate until 1975.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:43.003394-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/71000066.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/71000066/be53ae0d48-800.webp","url_1600":"https://nationalhistoricalregister.com/media/71000066/be53ae0d48-1600.webp","licence":"CC BY-SA 3.0","author":"Lfstar68","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:William_Floyd_House.JPG\" rel=\"noopener\">Lfstar68</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:William_Floyd_House.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75322112","wikipedia":"https://en.wikipedia.org/wiki/William_Floyd_House","wikidata":"https://www.wikidata.org/wiki/Q8009176"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/suffolk-county/floyd-william-house-71000066/"}