{"nrhp_refnum":"09001084","name":"DuPont-Guest Estate","other_names":["White Eagle","Templeton,  NYIT"],"category":"building","location":{"address":"S. side of Northern Blvd. between Cotillion Ct. & DuPont Ct.","address_restricted":false,"city":"Brookville","county":"Nassau County","state":"NY","lat":40.80994508500004,"lon":-73.61495773935614,"geom_source":"nps_gis"},"listed_date":"2009-12-11","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"A 41,000-square-foot red brick Georgian Revival mansion with surrounding gardens and a garage, set on about 44 acres in Brookville, Nassau County, on Long Island's north shore. It was commissioned in 1916 by Alfred I. DuPont and completed in 1918, designed by Thomas Hastings of Carrère and Hastings.","why_significant":"The nomination presents the estate as a fine example of Thomas Hastings' late country house work and as a representative of the large seasonal estates built by wealthy families on Long Island's north shore. It is also tied to prominent owners, including Alfred I. DuPont and later Captain Frederick Guest and Amy Phipps Guest. The house retains high integrity in its original materials and character.","narrative":"Built as a summer retreat on Long Island's north shore, this red brick mansion in Brookville was commissioned in 1916 by Alfred I. DuPont and finished in 1918. Thomas Hastings of Carrère and Hastings designed it in the English Georgian Revival style, with limestone and marble detailing, a slate roof, an elliptical colonnade on the east side and terraced grounds. DuPont's wife died during construction, and he sold the furnished, never-occupied house in 1923 to Captain Frederick Guest and Amy Phipps Guest, who renamed it Templeton. They had Hastings's firm add windows, convert the entry hall to a marble stair hall and build a glass-enclosed garden room. The New York Institute of Technology acquired the property in 1972 and now uses it for offices, classrooms and meetings. About 44 of the original 260 acres remain. The house is valued as an example of Hastings' late country house work and of the north shore estate era, with original materials and character largely intact.","period_of_significance":null,"architect_builder":"Thomas Hastings of Carrère and Hastings","architectural_style":"Georgian Revival","criteria":[],"status_note":"Now known as the De Seversky Center on the New York Institute of Technology campus, used as offices and a conference and meeting center; described as in good condition.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:47.89812-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/09001084.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/09001084/84ca0b0c41-800.webp","url_1600":"https://nationalhistoricalregister.com/media/09001084/84ca0b0c41-1600.webp","licence":"CC BY-SA 3.0","author":"Muncharelli","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:DuPont-Guest_Estate.JPG\" rel=\"noopener\">Muncharelli</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:DuPont-Guest_Estate.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75319091","wikipedia":"https://en.wikipedia.org/wiki/DuPont-Guest_Estate","wikidata":"https://www.wikidata.org/wiki/Q5310009"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/nassau-county/dupont-guest-estate-09001084/"}