{"nrhp_refnum":"15000030","name":"Elmwood","other_names":["Alward, William N., House"],"category":"building","location":{"address":"19 N. Walnut St.","address_restricted":false,"city":"Nunda","county":"Livingston County","state":"NY","lat":42.58133699250007,"lon":-77.93101223656038,"geom_source":"nps_gis"},"listed_date":"2015-02-24","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"Elmwood, also called the Thomas F. Youngs Estate, is a Greek Revival country house with a group of outbuildings on Cove Road in Oyster Bay, Nassau County, New York. The main house was built in 1836.","why_significant":"The house was built by New York City merchant Thomas F. Youngs as a country residence and is an early example of a social and economic pattern that shaped Oyster Bay in the 19th and 20th centuries. It is described as a particularly elegant example of Greek Revival architecture in Nassau County. It also survives with its mid-19th-century dependencies in a still-rural, wooded setting, and was later owned by Charles L. Tiffany II.","narrative":"Elmwood is a Greek Revival country estate on a wooded rise along Cove Road in Oyster Bay. Thomas F. Youngs, a prosperous New York City merchant, built the two-story frame house in 1836 on family land south of the village, within easy reach of his city office by steamboat or sloop. Its dominant feature is a tetrastyle Ionic portico, and the interior has a central hall, tapered and pedimented window and door frames with plaster rosettes, and black marble mantels. A two-story south wing was added around 1915 during the ownership of Charles L. Tiffany II, who was connected to Tiffany and Company. The grounds retain a gatehouse, gazebo, icehouse, greenhouse, barns, an octagonal water tower and a brick coach house of 1918. Elmwood is valued as an elegant Greek Revival residence and as an early example of the country-seat pattern in Oyster Bay, preserved with its outbuildings in a rural setting.","period_of_significance":"19th Century","architect_builder":null,"architectural_style":"Greek Revival","criteria":[],"status_note":"Described as in excellent condition and unaltered, and still used as a seasonal private residence.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:48.848641-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/75001200.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/15000030/42badbde31-800.webp","url_1600":"https://nationalhistoricalregister.com/media/15000030/42badbde31-1600.webp","licence":"CC BY-SA 2.0","author":"Doug Kerr","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Elmwood_Nunda_NY_Nov_09.jpg\" rel=\"noopener\">Doug Kerr</a>, <a href=\"https://creativecommons.org/licenses/by-sa/2.0\" rel=\"license noopener\">CC BY-SA 2.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Elmwood_Nunda_NY_Nov_09.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75319095","wikipedia":"https://en.wikipedia.org/wiki/Elmwood_(Nunda,_New_York)","wikidata":"https://www.wikidata.org/wiki/Q23073803"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/livingston-county/elmwood-15000030/"}