{"nrhp_refnum":"10000403","name":"Callowhill Industrial Historic District","other_names":[],"category":"district","location":{"address":"Roughly bounded by Pearl St, N Broad St, Hamilton St, and the Reading Railroad Viaduct","address_restricted":false,"city":"Philadelphia","county":"Philadelphia","state":"PA","lat":39.961002455000056,"lon":-75.15853800099373,"geom_source":"nps_gis"},"listed_date":"2010-06-28","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Industry","Architecture","Engineering","Commerce","Transportation"],"significance_levels":["local"],"summary":{"what_it_is":"A historic district of about fourteen city blocks and nearly six acres one mile north of City Hall in downtown Philadelphia, made up mainly of multi-story industrial loft buildings, with rows of early nineteenth-century houses and the elevated Reading Railroad Viaduct.","why_significant":"The district is argued to be significant for its diversified specialty manufacturing, which characterized Philadelphia industry in the nineteenth and twentieth centuries, and for its concentration of industrial buildings showing the evolution of industrial architecture from the late nineteenth to early twentieth century. The Lasher Building and Terminal Commerce Building are cited for Art Deco detailing, and the Reading Railroad Viaduct for its engineering.","narrative":"Located about one mile north of Philadelphia City Hall, the Callowhill Industrial Historic District covers roughly fourteen blocks, mostly filled with multi-story industrial loft buildings of reinforced concrete and brick, many dating from the 1890s through the 1930s. Its earliest surviving houses are brick row houses from around 1830 along Callowhill, Wood and Carlton Streets. The district developed after the Reading Railroad reached the area in 1838, drawing foundries, factories and light manufacturers. The Philadelphia & Reading Railroad built an elevated viaduct between 1890 and 1893 to carry freight and passengers. Industries in the district included automobile showrooms and repair, printing and publishing, and apparel, with several thousand workers employed there through the 1970s. Notable buildings include the Lasher Building of 1927, with its concrete Art Deco ornament, and the 1931 Terminal Commerce Building.","period_of_significance":"1830-1959","architect_builder":null,"architectural_style":"Commercial style; Greek Revival and Italianate (row houses); Art Deco (Lasher and Terminal Commerce buildings); Mission/Spanish Colonial Revival (Philadelphia City Morgue); Colonial Revival (Overland Motor Company Building)","criteria":["A","C"],"status_note":"The Reading Railroad Viaduct has remained in a state of disuse after 1984; the multi-story loft buildings have been converted into offices and residential units.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:10:27.410529-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/10000403.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/10000403/55e0fb090f-800.webp","url_1600":"https://nationalhistoricalregister.com/media/10000403/55e0fb090f-1600.webp","licence":"Public domain","author":"Smallbones","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Wood_n_12th_Philly.JPG\" rel=\"noopener\">Smallbones</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Wood_n_12th_Philly.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71997510","wikipedia":"https://en.wikipedia.org/wiki/Callowhill_Industrial_Historic_District","wikidata":"https://www.wikidata.org/wiki/Q5022937"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/philadelphia/callowhill-industrial-historic-district-10000403/"}