{"nrhp_refnum":"80002781","name":"Llenroc","other_names":[],"category":"building","location":{"address":"100 Cornell Ave.","address_restricted":false,"city":"Ithaca","county":"Tompkins County","state":"NY","lat":42.446779770000035,"lon":-76.49189843299996,"geom_source":"nps_gis"},"listed_date":"1980-04-16","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Industry","Education","Architecture","Social History","Invention"],"significance_levels":["national"],"summary":{"what_it_is":"Llenroc is a stone Gothic Revival mansion at 100 Cornell Avenue in Ithaca, New York, designed in 1865 as the home of Ezra Cornell. It sits on a knoll above the Cornell campus and now serves as a fraternity house.","why_significant":"The nomination calls Llenroc the last surviving building tied to the personal life of Ezra Cornell, founder of Cornell University. It is described as Ithaca's finest post-Civil War Gothic residence and an exceptionally well-preserved example of high style masonry Gothic Revival architecture, with outstanding craftsmanship supervised by Cornell himself.","narrative":"Llenroc is a stone mansion on a grassy knoll at 100 Cornell Avenue in Ithaca, overlooking Cayuga Lake. Designed in 1865 for Ezra Cornell, it took nearly ten years to complete. The house is built of smooth-faced Ithaca limestone with gray Onondaga limestone trim, and its steep gables, jerkin-headed dormers, slate roof and carved details express the Gothic Revival style. German stonecutters were brought in, and Cornell oversaw much of the construction himself while also building the first buildings of the university he founded. Inside, black walnut and oak woodwork, marble fireplaces, a carved three-flight staircase and an ornate dining room survive. The nomination describes it as the last extant building linked to Cornell's personal life and as Ithaca's finest post-Civil War Gothic residence. The Delta Phi fraternity chapter that owns and occupies it has preserved its character, and both the exterior and principal rooms remain virtually unchanged.","period_of_significance":"1865-1875","architect_builder":"Nichols and Brown","architectural_style":"Gothic Revival","criteria":[],"status_note":"Owned and occupied by the Pi chapter of Delta Phi fraternity; exterior and principal rooms described as virtually unchanged, with kitchen, pantries, basement and third floor adapted for fraternity use.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:42.025773-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/80002781.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/80002781/fd296a7675-800.webp","url_1600":"https://nationalhistoricalregister.com/media/80002781/fd296a7675-1600.webp","licence":"Public domain","author":"Cornell010 at English Wikipedia","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Llenroc,_Cornell_University.jpg\" rel=\"noopener\">Cornell010 at English Wikipedia</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Llenroc,_Cornell_University.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75322514","wikipedia":"https://en.wikipedia.org/wiki/Llenroc","wikidata":"https://www.wikidata.org/wiki/Q6662005"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/tompkins-county/llenroc-80002781/"}