{"nrhp_refnum":"87000376","name":"Westinghouse Air Brake Company General Office Building","other_names":["Library Hall"],"category":"building","location":{"address":"Marguerite and Bluff Sts.","address_restricted":false,"city":"Wilmerding","county":"Allegheny County","state":"PA","lat":40.39208133500006,"lon":-79.80727927799995,"geom_source":"nps_gis"},"listed_date":"1987-03-06","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Industry","Community Planning and Development","Architecture","Social History"],"significance_levels":["local"],"summary":{"what_it_is":"The Westinghouse Air Brake Company General Office Building, popularly known as \"The Castle,\" is a large stone and brick office building in Wilmerding, Allegheny County, Pennsylvania, set on a sloping hillside above the town. It was originally built in 1890 as Library Hall, a community center for the company town.","why_significant":"The nomination argues the building is an outstanding example of large-scale historicist architecture in Western Pennsylvania, combining Richardson Romanesque and Chateauesque styling from two building campaigns. It is presented as the region's most important non-industrial building associated with George Westinghouse's company and as the centerpiece of a company-built town, with a history reflecting changing relations between the company and the community.","narrative":"Built in 1890 as Library Hall, a community center for the company town of Wilmerding, the building was later rebuilt after a fire in 1896 and enlarged with a major wing in 1926. It is a T-shaped structure of stone and Roman brick under steep slate roofs with copper cresting, and it is dominated by an octagonal stone clock tower with a cone roof. Its interior contains terrazzo halls, marble stairhalls, and pegged oak paneled executive offices in the 1926 wing, along with a dining room with ceiling lamps reputedly by Tiffany. The building was used for community purposes, including a library, gymnasium, and bathing rooms, until about 1907, when it became solely the headquarters of the Westinghouse Air Brake Company. It is regarded as a notable example of turn-of-the-century historicist design in the region and as the principal non-industrial building linked to the Westinghouse company.","period_of_significance":"1890-1926","architect_builder":"Frederick J. Osterling; Janssen & Cocken (architects)","architectural_style":"Richardson Romanesque/Chateauesque","criteria":["A","C"],"status_note":"Altered; the 1890/1896 portion has minor exterior alterations and the 1926 wing has virtually no exterior modification.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:32.213875-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/87000376.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/87000376/018481f68b-800.webp","url_1600":"https://nationalhistoricalregister.com/media/87000376/018481f68b-1600.webp","licence":"CC BY-SA 4.0","author":"Lee Paxton","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:WestinghouseAirBrakeCompanyGeneralOfficeBuilding.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:WestinghouseAirBrakeCompanyGeneralOfficeBuilding.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71998775","wikipedia":"https://en.wikipedia.org/wiki/Westinghouse_Air_Brake_Company_General_Office_Building","wikidata":"https://www.wikidata.org/wiki/Q7988934"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/allegheny-county/westinghouse-air-brake-company-general-office-building-87000376/"}