{"nrhp_refnum":"82003812","name":"Philadelphia Stock Exchange","other_names":[],"category":"building","location":{"address":"1409 1411 Walnut St.","address_restricted":false,"city":"Philadelphia","county":"Philadelphia","state":"PA","lat":39.949204792000046,"lon":-75.16432757299998,"geom_source":"nps_gis"},"listed_date":"1982-08-31","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Commerce","Architecture"],"significance_levels":["state"],"summary":{"what_it_is":"A U-shaped, steel-framed 12-story office building on Walnut Street in center city Philadelphia, serving as the city's stock exchange. It was erected in 1911 to designs by Horace Trumbauer.","why_significant":"The building is argued to be a major architectural landmark by Horace Trumbauer, one of Philadelphia's most important architects. Its classical base and colonnade draw on George B. Post's New York Stock Exchange, while its upper walls show an early expression of steel structure. It also marks the shift of the city's commercial center toward Broad and Walnut Streets.","narrative":"Built in 1911 on Walnut Street in center city Philadelphia, this twelve-story steel-framed office building was designed by Horace Trumbauer as the home of the city's stock exchange. Its U-shaped plan wraps a central light court, and a two-story Corinthian colonnade rises above a massive arched commercial base of seven bays. The colonnade was modeled in part on George B. Post's New York Stock Exchange. Above the cornice, the walls rise through eight stories in a regular grid of brick-sheathed piers and terra cotta spandrels, an early expression of the steel frame beneath. The interior lobbies retain marble wainscoting, and the elevator surrounds carry the classical detailing of the exterior. The building is valued for its architecture and for its place in the shift of Philadelphia's corporate center from the old district near Independence Hall toward Broad and Walnut Streets, close to the new City Hall. It is regarded as a mature example of Trumbauer's commercial work.","period_of_significance":"1911/1927","architect_builder":"Horace Trumbauer (architect)","architectural_style":null,"criteria":["C"],"status_note":"Excellent condition, unaltered, original site","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:33.287333-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/82003812.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/82003812/c1c0750217-800.webp","url_1600":"https://nationalhistoricalregister.com/media/82003812/c1c0750217-1600.webp","licence":"Public domain","author":"Smallbones","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Philly_Stock_Exchange.JPG\" rel=\"noopener\">Smallbones</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Philly_Stock_Exchange.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/71997132","wikipedia":null,"wikidata":"https://www.wikidata.org/wiki/Q48932172"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/philadelphia/philadelphia-stock-exchange-82003812/"}