{"nrhp_refnum":"85003470","name":"General Electric Switchgear Plant","other_names":[],"category":"building","location":{"address":"Seventh and Willow Sts.","address_restricted":false,"city":"Philadelphia","county":"Philadelphia","state":"PA","lat":39.95868494400003,"lon":-75.14983196799994,"geom_source":"nps_gis"},"listed_date":"1985-10-31","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Industry","Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"A seven-story reinforced concrete factory at Seventh and Willow Streets in Philadelphia, Pennsylvania, built in 1916 as a General Electric switchgear plant. It was designed and built by the William Steele and Sons firm.","why_significant":"The nomination argues the building is Philadelphia's best preserved monument to the General Electric industrial enterprise and an early example of the modern factory. It is said to have developed an expressed concrete frame with masonry infill panels that became typical of multi-story manufacturing plants in the region. The document also argues that this industrial vocabulary influenced the so-called Philadelphia School associated with Louis Kahn.","narrative":"Built in 1916 at Seventh and Willow Streets in Philadelphia, the General Electric switchgear plant is a seven-story factory of reinforced concrete, designed and constructed by William Steele and Sons. Its concrete frame is expressed on the exterior, with brick infill panels between the bays and a terra cotta clad principal entrance on the 7th Street facade. Inside, a grid of mushroom columns supports wide floors, and the poured concrete stair towers remain largely intact. An attic story added around 1921 carries a sawtooth skylight over the upper floor. The plant was the site where metal clad switchgear was developed, a product that helped make reliable electric power distribution possible for industry. The nomination treats the building as one of the clearest surviving examples of early twentieth-century industrial design in the region and links its structural vocabulary to later Philadelphia architecture. Most neighboring factories of the period have been demolished, which makes its survival notable. The building is regarded as unusually intact for a factory of its type.","period_of_significance":"1916-1921","architect_builder":"William Steele and Co. (builder)","architectural_style":null,"criteria":["A","C"],"status_note":"The description states the building is in remarkably good condition and retains the vast majority of its original features.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:34.366226-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/85003470.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/85003470/9cd9077b31-800.webp","url_1600":"https://nationalhistoricalregister.com/media/85003470/9cd9077b31-1600.webp","licence":"CC BY-SA 4.0","author":"Beyond My Ken","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:GE_Switchgear_Plant_from_west.jpg\" rel=\"noopener\">Beyond My Ken</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:GE_Switchgear_Plant_from_west.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71997316","wikipedia":"https://en.wikipedia.org/wiki/General_Electric_Switchgear_Plant","wikidata":"https://www.wikidata.org/wiki/Q5531881"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/philadelphia/general-electric-switchgear-plant-85003470/"}