{"nrhp_refnum":"75001200","name":"Elmwood","other_names":["Young,Thomas F.,Estate"],"category":"building","location":{"address":"E side of Cove Rd.","address_restricted":false,"city":"Oyster Bay","county":"Nassau County","state":"NY","lat":40.866465531000074,"lon":-73.49532217579664,"geom_source":"nps_gis"},"listed_date":"1975-04-03","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"Elmwood is a Greek Revival country house on Cove Road in Oyster Bay, Nassau County, New York, built in 1836 for New York City merchant Thomas F. Youngs. It sits on a 26-acre wooded estate with 19th-century outbuildings.","why_significant":"The nomination presents Elmwood as an elegant example of Greek Revival architecture in Nassau County and an early illustration of the pattern of wealthy city merchants building country residences in Oyster Bay. It also notes its later ownership by Charles L. Tiffany II, and that the estate survives in a rural setting with an extensive group of frame dependencies.","narrative":"Elmwood is a country estate on Cove Road in Oyster Bay, built in 1836 for Thomas F. Youngs, a New York City merchant from one of the area's earliest settler families. The two-story wood-frame house is dominated by a tetrastyle Ionic portico, with a plain wall surface, a prominent cornice and architrave, and symmetrical windows. Inside, a central hall holds the staircase, and the tapered, pedimented window and door frames carry plaster rosettes, with black marble mantels and decorative plaster at the stair ends. A two-story south wing was added around 1915 during the ownership of Charles L. Tiffany II, and a brick coach house followed in 1918. The grounds hold a gatehouse, gazebo, icehouse, greenhouse, barns and an octagonal water tower. The house is valued as a refined Greek Revival design and as an early example of the merchant country seats that shaped Oyster Bay's 19th and 20th century development, still in a rural setting on about 26 acres.","period_of_significance":null,"architect_builder":"Thomas F. Youngs (original owner/builder), possibly assisted by his brother Henry","architectural_style":"Greek Revival","criteria":[],"status_note":"Excellent condition and unaltered; occupied as a private, seasonal residence.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:39.156517-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/75001200.pdf"},"photo":null,"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75319095","wikipedia":"https://en.wikipedia.org/wiki/Elmwood_(Oyster_Bay,_New_York)","wikidata":"https://www.wikidata.org/wiki/Q5366950"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/nassau-county/elmwood-75001200/"}