{"nrhp_refnum":"03001046","name":"Philosophy Hall","other_names":[],"category":"building","location":{"address":"1150 Amsterdam Avenue","address_restricted":false,"city":"New York","county":"Manhattan","state":"NY","lat":40.80745849550004,"lon":-73.96094478148123,"geom_source":"nps_gis"},"listed_date":"2003-07-31","is_nhl":true,"nhl_designated_date":"2003-07-31","areas_of_significance":["Communications","Engineering","Invention"],"significance_levels":["national"],"summary":{"what_it_is":"Philosophy Hall is an eight-story brick and limestone building on the Columbia University campus at 1150 Amsterdam Avenue, New York City. It was built in 1910 in the Italian Renaissance Revival style and designed by McKim, Mead and White.","why_significant":"The building is nationally significant for its long association with radio inventor Edwin H. Armstrong, who worked in its second-floor laboratories from 1913 until 1954. His regenerative circuit, superheterodyne receiver, superregenerative receiver and wide-band FM were conceived, developed or demonstrated there. The nomination calls it the property most strongly tied to each of his major developments, with a high degree of integrity.","narrative":"Philosophy Hall is an eight-story steel-frame building of brick with limestone trim, completed in 1910 on the Columbia University campus in Manhattan. McKim, Mead and White designed it in the Italian Renaissance Revival style, with a low hipped copper roof, rusticated quoins, and a two-story arched entrance on the west side. It was first built to house the engineering department and now holds offices, classrooms and administrative space. Its significance rests on Edwin H. Armstrong, the radio inventor, who had his laboratory and office on the second floor for more than forty years. There he refined the regenerative circuit and demonstrated it to Marconi and AT&T executives in 1913 and 1914. He also worked there on the superheterodyne receiver, the superregenerative receiver and wide-band frequency modulation. Armstrong's office, laboratory and a lecture room keep their original configuration, and continuous educational use has kept the building well preserved.","period_of_significance":"1913-1954","architect_builder":"McKim, Mead and White","architectural_style":"Late 19th & 20th Century Revivals, Italian Renaissance","criteria":["A","B"],"status_note":"In continuous use as an educational facility and described as being in a good state of preservation.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:38.723773-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/03001046_NHL.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/03001046/ff74853daa-800.webp","url_1600":"https://nationalhistoricalregister.com/media/03001046/ff74853daa-1600.webp","licence":"CC BY 2.5","author":"Cjs2111 at English Wikipedia","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Philohall.JPEG\" rel=\"noopener\">Cjs2111 at English Wikipedia</a>, <a href=\"https://creativecommons.org/licenses/by/2.5\" rel=\"license noopener\">CC BY 2.5</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Philohall.JPEG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75315918","wikipedia":"https://en.wikipedia.org/wiki/Philosophy_Hall","wikidata":"https://www.wikidata.org/wiki/Q7186216"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/manhattan/philosophy-hall-03001046/"}