{"nrhp_refnum":"76001666","name":"Philadelphia City Hall","other_names":["Public Buildings"],"category":"building","location":{"address":"Penn Sq., Broad and Market Sts.","address_restricted":false,"city":"Philadelphia","county":"Philadelphia","state":"PA","lat":39.95249000800007,"lon":-75.16384477019297,"geom_source":"nps_gis"},"listed_date":"1976-12-08","is_nhl":true,"nhl_designated_date":"1976-12-08","areas_of_significance":["Art","Politics/Government","Architecture"],"significance_levels":["national"],"summary":{"what_it_is":"A municipal and county government building at the crossing of Broad and Market Streets in Penn Square, Philadelphia, Pennsylvania, owned by the City of Philadelphia. Construction ran from 1872 to 1901 and the building was occupied in stages from 1877 to 1898.","why_significant":"The nomination argues the building is the largest and most elaborate City Hall in America still in use and the tallest bearing-wall construction without a steel skeleton. Its sculpture program, designed by Alexander Milne Calder, and its interiors with polished marbles, handcarved woodwork and ornamental ceilings are presented as outstanding. It is also described as the greatest monument of the Second Empire style in America.","narrative":"Occupying Penn Square at the crossing of Broad and Market Streets in central Philadelphia, City Hall was built between 1872 and 1901, with offices occupied in stages from 1877 to 1898. Designed by John McArthur, Jr., with detailing assisted by Thomas U. Walter, it combines the functions of city hall and county courthouse. Its load-bearing walls rise to a 548-foot tower, and it was the tallest occupied building in America until 1909. Its facades follow the French Second Empire manner, with mansard roofs and towering pavilions, and its interior includes marble, wrought iron stairs, and two-story courtrooms. Alexander Milne Calder directed the sculpture program, which includes a 37-foot bronze statue of William Penn atop the tower. The building is regarded as the largest and most elaborate city hall in America still in use. It has also been the subject of long political disputes, and a 1957 demolition effort was rejected after an architectural study.","period_of_significance":"1871-1881","architect_builder":"John McArthur, Jr. and Thomas U. Walter","architectural_style":"Second Empire","criteria":[],"status_note":"Still used as a government building; the document states the building is still being used.","vacant_flag":false,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:30.128852-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/76001666_NHL.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/76001666/79bafdc3b2-800.webp","url_1600":"https://nationalhistoricalregister.com/media/76001666/79bafdc3b2-1600.webp","licence":"CC BY 2.0","author":"Versatile Aure","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Philadelphia-CityHall-2006.jpg\" rel=\"noopener\">Versatile Aure</a>, <a href=\"https://creativecommons.org/licenses/by/2.0\" rel=\"license noopener\">CC BY 2.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Philadelphia-CityHall-2006.jpg"},"district":{"nrhp_refnum":"84003529","name":"Broad Street Historic District (Additional Documentation)","url":"https://nationalhistoricalregister.com/districts/pennsylvania/broad-street-historic-district-additional-documentation-84003529/"},"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71994311","wikipedia":"https://en.wikipedia.org/wiki/Philadelphia_City_Hall","wikidata":"https://www.wikidata.org/wiki/Q1138183"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/philadelphia/philadelphia-city-hall-76001666/"}