{"nrhp_refnum":"86002634","name":"Cedarmere-Clayton Estates","other_names":[],"category":"district","location":{"address":"Bryant Ave. and Northern Blvd.","address_restricted":false,"city":"Roslyn Harbor","county":"Nassau County","state":"NY","lat":40.81002918550004,"lon":-73.64112640902582,"geom_source":"nps_gis"},"listed_date":"1986-09-29","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Landscape Architecture","Literature","Architecture"],"significance_levels":["national"],"summary":{"what_it_is":"A historic district of two contiguous estates on the east side of Hempstead Harbor in Roslyn Harbor, Nassau County, New York: the seven-acre Cedarmere (William Cullen Bryant estate) and the 165-acre Clayton (Bryce/Frick estate, now the Nassau County Museum of Fine Arts), developed from the early 1840s to the early 1930s.","why_significant":"The two estates were developed by three prominent families and show Roslyn Harbor's growth into an exclusive residential enclave. Cedarmere is tied to poet and editor William Cullen Bryant and a circle of leading American writers, artists and architects, with grounds designed by Frederick Law Olmsted. Clayton has a Georgian Revival mansion by Ogden Codman, Jr., later work by Allom, Lowell and Milliken, and gardens by Marian Coffin.","narrative":"Two neighboring estates on Hempstead Harbor in Roslyn Harbor, Long Island, make up this district. Cedarmere, on seven acres, was the country retreat of poet and newspaper editor William Cullen Bryant, who bought an older farmstead in 1843 and spent decades enlarging it. Its main house shows a neo-Colonial look with gambrel roofs and a wraparound porch, and its 1850 Gothic Revival mill and pond landscape, designed by Frederick Law Olmsted, remain. Across Bryant Avenue lies Clayton, a 165-acre estate where the Bryce family built a brick Georgian Revival mansion designed by Ogden Codman, Jr. After Henry Clay Frick bought the property in 1919, architects Charles Allom, Guy Lowell and Henry Milliken reworked buildings, and Marian Coffin redesigned the gardens. Together the estates contain seven contributing buildings and nine contributing structures. They show how a quiet farming village became a community of wealthy country retreats over ninety years, and they connect to many notable figures in American art and letters.","period_of_significance":"early 1840's-early 1930's","architect_builder":"Various, including Ogden Codman, Jr.; Sir Charles Allom; Guy Lowell; Henry Milliken (Milliken and Nevin); Frederick S. Copley; landscape architects Frederick Law Olmsted and Marian Coffin","architectural_style":"Colonial Revival (Cedarmere house); Gothic Revival (mill); Georgian Revival (Clayton mansion and gatehouse)","criteria":[],"status_note":"Listed as occupied and in use as a museum, owned by the County of Nassau. The condition is marked as deteriorated, with an original site and altered.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:46.180396-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/86002634.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/86002634/c18b03dc80-800.webp","url_1600":"https://nationalhistoricalregister.com/media/86002634/c18b03dc80-1600.webp","licence":"CC BY-SA 4.0","author":"Antony-22","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Cedarmere_2016.JPG\" rel=\"noopener\">Antony-22</a>, <a href=\"https://creativecommons.org/licenses/by-sa/4.0\" rel=\"license noopener\">CC BY-SA 4.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Cedarmere_2016.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75319075","wikipedia":"https://en.wikipedia.org/wiki/Cedarmere-Clayton_Estates","wikidata":"https://www.wikidata.org/wiki/Q1052546"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/nassau-county/cedarmere-clayton-estates-86002634/"}