{"nrhp_refnum":"66000536","name":"Carnegie, Andrew, Mansion","other_names":["Cooper-Hewitt Museum"],"category":"building","location":{"address":"2 E. 91st St.","address_restricted":false,"city":"New York","county":"Manhattan","state":"NY","lat":40.78420807000006,"lon":-73.9578387274392,"geom_source":"nps_gis"},"listed_date":"1966-11-13","is_nhl":true,"nhl_designated_date":"1966-11-13","areas_of_significance":["Industry","Commerce"],"significance_levels":["national"],"summary":{"what_it_is":"A 64-room stone and brick mansion at 2 East 91st Street on Fifth Avenue in Manhattan, built for Andrew Carnegie from 1899 to 1903 and designed by Babb, Cook and Willard. The nominated property also includes the adjoining 1905 Miller House townhouse.","why_significant":"The mansion was selected to commemorate Andrew Carnegie's role in the American iron and steel industry under the Commerce and Industry theme. Carnegie built it in 1901 after selling his steel interests for $492,000,000 and lived there until his death in 1919, giving away much of his fortune. The form also notes that the exterior is largely unaltered.","narrative":"Built between 1899 and 1903 on Fifth Avenue at East 91st Street, this 64-room mansion was home to steelmaker Andrew Carnegie. Designed by Babb, Cook and Willard in a modified Georgian eclectic style, it has rusticated stone on the ground floor, carved stone cornices and balustrades, and a copper and glass canopy over the entrance. Inside, the first floor features Scottish oak panelling and a long central hallway. A 1905 townhouse bought for Carnegie's daughter was later linked to the grounds by a pergola. Carnegie moved in after selling his steel properties in 1901 for $492,000,000 and lived there for 18 years while giving away about $350,000,000 to philanthropic causes. The property was chosen to commemorate his place in the nation's iron and steel industry. Columbia University's School of Social Work later used it, and the Smithsonian Institution began restoring it as a decorative arts museum, keeping the largely unaltered exterior.","period_of_significance":"1901-1919","architect_builder":"Babb, Cook and Willard","architectural_style":"Modified Georgian eclectic","criteria":[],"status_note":"Occupied; being restored by the Smithsonian Institution for use as the Cooper-Hewitt Museum of Decorative Arts. The exterior is largely unaltered and the interior was altered during its use by Columbia University's School of Social Work.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:39.703669-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/66000536_NHL.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/66000536/3e578a5d94-800.webp","url_1600":"https://nationalhistoricalregister.com/media/66000536/3e578a5d94-1600.webp","licence":"Public domain","author":"Jim.henderson","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Cooper-hewitt_90_jeh.JPG\" rel=\"noopener\">Jim.henderson</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Cooper-hewitt_90_jeh.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75315912","wikipedia":"https://en.wikipedia.org/wiki/Andrew_Carnegie_Mansion","wikidata":"https://www.wikidata.org/wiki/Q4756547"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/manhattan/carnegie-andrew-mansion-66000536/"}