{"nrhp_refnum":"79001633","name":"Field, Marshall, III, Estate","other_names":["Caumsett State Park"],"category":"building","location":{"address":"Lloyd Harbor Rd.","address_restricted":false,"city":"Lloyd Harbor","county":"Suffolk County","state":"NY","lat":40.93078657750007,"lon":-73.46698722004535,"geom_source":"nps_gis"},"listed_date":"1979-04-30","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Agriculture","Architecture"],"significance_levels":["state"],"summary":{"what_it_is":"Caumsett State Park in Lloyd Harbor, Suffolk County, New York, is the former Marshall Field III estate, a 1,400-acre country seat on Lloyd Neck between Long Island Sound and Lloyd Harbor. It was designed by John Russell Pope and completed in 1925, and it incorporates the early eighteenth-century Henry Lloyd House.","why_significant":"The nomination argues the estate is architecturally, historically and culturally significant as the best-preserved of Long Island's early twentieth-century country estates, with a Georgian Revival mansion and many dependencies by John Russell Pope. It also preserves the 1711 Henry Lloyd House, evidence of prehistoric occupation, the birthplace of poet Jupiter Hammon, and a varied natural landscape.","narrative":"Caumsett State Park occupies about 1,400 acres on Lloyd Neck, between Long Island Sound and Lloyd Harbor. It began as the country seat of Marshall Field III, who bought roughly two thousand acres in 1921 and hired architect John Russell Pope to plan a self-sustaining estate. Completed in 1925, the property includes a rose-brick Georgian Revival main house, a garage for twenty automobiles, a polo stable, cottages, greenhouses, and a large farm complex for prize Guernsey cattle. The estate had its own electric and water systems, still operating, and a staff of eighty-five. Pope also incorporated the Henry Lloyd House, built in 1711, as a gate lodge. That house is the oldest surviving on Lloyd Neck, and Jupiter Hammon, regarded as America's first black poet, was born on the manor. Archeological work found evidence of prehistoric occupation. New York State bought the estate in 1961 and operates it as a park.","period_of_significance":"1923-25","architect_builder":"John Russell Pope","architectural_style":"Georgian Revival","criteria":[],"status_note":"Now a state park owned by the State of New York. Many buildings are in use by park staff, an outdoor education center and a historical society; the Winter Cottage is no longer in use. The two west wings of the main house were removed in 1950.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:39.898793-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/79001633.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/79001633/0a05939203-800.webp","url_1600":"https://nationalhistoricalregister.com/media/79001633/0a05939203-1600.webp","licence":"CC BY 2.0","author":"Tony V.","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Caumsett_SP_Winter_Cottage.jpg\" rel=\"noopener\">Tony V.</a>, <a href=\"https://creativecommons.org/licenses/by/2.0\" rel=\"license noopener\">CC BY 2.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Caumsett_SP_Winter_Cottage.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75322100","wikipedia":"https://en.wikipedia.org/wiki/Caumsett_State_Historic_Park_Preserve","wikidata":"https://www.wikidata.org/wiki/Q5054543"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/suffolk-county/field-marshall-iii-estate-79001633/"}