{"nrhp_refnum":"79001596","name":"Moore, Benjamin, Estate","other_names":["Chelsea"],"category":"building","location":{"address":"N of Muttontown on NY 25A","address_restricted":false,"city":"Muttontown","county":"Nassau County","state":"NY","lat":40.839024070500045,"lon":-73.53838804378586,"geom_source":"nps_gis"},"listed_date":"1979-05-14","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Landscape Architecture","Architecture"],"significance_levels":["state"],"summary":{"what_it_is":"Chelsea, the forty-two acre Benjamin Moore Estate, is a Gold Coast country estate in Muttontown, Nassau County, New York, with a main house designed by William Adams Delano in 1923-4, plus a gate house, garage, conservatory, gardens, gazebo and sheds.","why_significant":"The nomination calls it one of the best preserved Long Island Gold Coast mansions. It combines Chinese and French Renaissance elements in an eclectic design by Delano of Delano and Aldrich, with imaginative landscape design. It also illustrates 1920s ideas of restrained estate design and is near the center of the Muttontown Preserve.","narrative":"Chelsea is a forty-two acre country estate in Muttontown, on Long Island's Gold Coast, built for Benjamin Moore and his wife. William Adams Delano of Delano and Aldrich designed the main house in 1923-4 and added a service wing in 1929. The house is roughly U-shaped, two and one-half stories, and covered in whitewashed concrete block. Its design blends Chinese and French Renaissance sources, with a severe front facade, a brick tourelle, a rambling roof and a corner moat. The grounds hold gardens, fountains, a lily pond, a gate house, garage, conservatory and octagonal gazebo. The Moores used the estate as their principal residence rather than a seasonal retreat. They later gave land to Nassau County for what became the Muttontown Preserve. The estate was recognized as a well preserved example of 1920s estate design and of Gold Coast development, and as work of a prominent architectural firm.","period_of_significance":"1923-4","architect_builder":"William Adams Delano","architectural_style":"Eclectic combination of Chinese and French Renaissance elements","criteria":[],"status_note":"Described in the form as still in private residential use, with the property to become part of the Muttontown Preserve; the county owner's letter says it operates the property as a historical and natural preserve.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:38.472033-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/79001596.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/79001596/464c5af963-800.webp","url_1600":"https://nationalhistoricalregister.com/media/79001596/464c5af963-1600.webp","licence":"CC BY-SA 4.0","author":"DanTD","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Chelsea-Benjamin_Moore_Estate-1.jpg\" rel=\"noopener\">DanTD</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:Chelsea-Benjamin_Moore_Estate-1.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75319157","wikipedia":"https://en.wikipedia.org/wiki/Benjamin_Moore_Estate","wikidata":"https://www.wikidata.org/wiki/Q4889037"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/nassau-county/moore-benjamin-estate-79001596/"}