{"nrhp_refnum":"10001124","name":"Old Westbury Gardens-Phipps, John S., Estate (Boundary Increase)","other_names":["Westbury House"],"category":"district","location":{"address":"71 Old Westbury Rd","address_restricted":false,"city":"Old Westbury","county":"Nassau County","state":"NY","lat":40.775908537500044,"lon":-73.59287363497067,"geom_source":"nps_gis"},"listed_date":"2011-01-10","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture","Landscape Architecture"],"significance_levels":["state"],"summary":{"what_it_is":"A 187-acre former country estate of John S. and Margarita Grace Phipps in Old Westbury, Nassau County, New York, now a museum and public gardens. Westbury House was built in 1906-1907, with landscape design by George A. Crawley.","why_significant":"The estate is argued to be significant for landscape architecture, with Crawley's design joining house and grounds into an English-style park of broad lawns, tree-lined allées and formal gardens. It also reflects the Phipps family's ownership and the estate's expansion between 1906 and 1958. The boundary increase adds descriptions of the gardens and landscape features that the 1976 listing lacked, plus acreage acquired since then.","narrative":"Old Westbury Gardens occupies 187 acres in the Village of Old Westbury, New York, and preserves the remaining core of the country estate of John S. and Margarita Grace Phipps. Westbury House, a red brick mansion with limestone details and a Collyweston stone slate roof, was built in 1906-1907 on the highest point of the property. George A. Crawley designed both the house and its grounds, grading the land and laying out long allées of lindens, beeches and hemlock, along with a Walled Garden, ponds and a pool area. Later alterations to the house were made by architects including Horace Trumbauer, who extended the Red Ballroom in 1919. The estate is significant for landscape architecture, reflecting a unified plan of house and gardens in the manner of an English park. This boundary increase adds acreage acquired since the first listing, along with fuller descriptions of the gardens, outbuildings and landscape features. The property is now run as a museum and public garden.","period_of_significance":"1906-1958","architect_builder":"George A. Crawley (house and landscape); Horace Trumbauer, James W. O'Connor and others made later alterations; Paul R. Smith (swimming pool area, 1916)","architectural_style":"Beaux Arts","criteria":["C"],"status_note":"Owned and operated by a not-for-profit organization as a museum and gardens open to the public and for special events; some allées are being restored.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:48.468955-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/10001124.pdf"},"photo":null,"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75319167","wikipedia":null,"wikidata":null},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/nassau-county/old-westbury-gardens-phipps-john-s-estate-boundary-increase-10001124/"}