{"nrhp_refnum":"74001735","name":"Byers-Lyons House","other_names":[],"category":"building","location":{"address":"901 Ridge Ave.","address_restricted":false,"city":"Pittsburgh","county":"Allegheny County","state":"PA","lat":40.44990044600007,"lon":-80.01581205699995,"geom_source":"nps_gis"},"listed_date":"1974-11-19","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"A pair of joined three-and-a-half-story houses forming one L-shaped town house at the southeast corner of Ridge and Galveston avenues on Pittsburgh's North Side.","why_significant":"The nomination argues that the house is one of the few remaining millionaire mansions in Pittsburgh and that its single-dwelling appearance from two joined houses is unique in the city. Its courtyard plan is described as almost unique in Pittsburgh, and its subdued eclectic style is seen as an important part of the city's architectural continuity.","narrative":"Two houses joined into one L-shaped mansion on a corner of Ridge and Galveston avenues on Pittsburgh's North Side, built as town houses in a densely built district. Designed by the firm Alden and Harlow, the pair combines Chateauesque massing with Romanesque, French and Flemish Renaissance details, and together they hold ninety rooms and fourteen bathrooms. Their courtyard entrance plan is rare in Pittsburgh, and the joined pair gives the appearance of a single dwelling. Brownstone trim and Pompeian brick create a polychrome facade, with arched verandahs in a cloister style. The house was built for industrialist Alexander M. Byers, his daughter and her husband, J. Denniston Lyons, a banker and broker. It is one of the few remaining millionaire mansions in the city. Its planning and architecture are regarded as an important part of Pittsburgh's architectural continuity, anticipating modern forms within a late Victorian setting. The wrought iron courtyard gates are also notable.","period_of_significance":null,"architect_builder":"Alden and Harlow (architects)","architectural_style":"Chateauesque with Romanesque and simple French and Flemish Renaissance elements","criteria":[],"status_note":"Good condition but needs minor repairs; brownstone has spalled badly; currently used for offices.","vacant_flag":false,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:28.962525-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/74001735.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/74001735/4aea054836-800.webp","url_1600":"https://nationalhistoricalregister.com/media/74001735/4aea054836-1600.webp","licence":"CC BY-SA 4.0","author":"Lee Paxton","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Byers-LyonsHouse.jpg\" rel=\"noopener\">Lee Paxton</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:Byers-LyonsHouse.jpg"},"district":{"nrhp_refnum":"78002334","name":"Allegheny West Historic District","url":"https://nationalhistoricalregister.com/districts/pennsylvania/allegheny-west-historic-district-78002334/"},"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71997630","wikipedia":"https://en.wikipedia.org/wiki/Byers-Lyons_House","wikidata":"https://www.wikidata.org/wiki/Q5004063"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/allegheny-county/byers-lyons-house-74001735/"}