{"nrhp_refnum":"86001940","name":"Republic Iron and Steel Office Building","other_names":["Republic Steel Hospital"],"category":"building","location":{"address":"415 S. Market St.","address_restricted":false,"city":"Youngstown","county":"Mahoning County","state":"OH","lat":41.095875198000044,"lon":-80.65186539899997,"geom_source":"nps_gis"},"listed_date":"1986-07-23","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Industry","Architecture"],"significance_levels":["state","local"],"summary":{"what_it_is":"An eight-story Classical Revival office building at 415 S. Market Street in Youngstown, Ohio, beside the Mahoning River. Its first six floors were built in 1910-11 and two more were added in 1920, with a two-story c. 1916 addition attached on the south.","why_significant":"The building was the national headquarters of Republic Iron and Steel Company from 1911 until about 1980. It symbolizes Youngstown's role as a major iron and steel center. It also represents early 20th century office design, with a defined base, shaft and capital and Classical Revival treatment, and it is one of two surviving buildings from the Brown-Bonnell Works site.","narrative":"Rising eight stories beside the Mahoning River at the southern entrance to downtown Youngstown, this Classical Revival office building served as the national headquarters of Republic Iron and Steel Company. The first six floors were completed in 1911, and two more were added in 1920. Wide stone courses separate the base, shaft and upper floors, while bays grouped in threes and divided by brick pilasters emphasize height. A two-story brick addition of about 1916 stands to the south, later used as a clock house and then a mill hospital. The company chose the site of its former Brown-Bonnell Works, where Youngstown's first finishing mill was built in 1846. Republic was then the city's largest steel producer, occupying 230 acres in six plants and employing 8,000 men. The building housed the company's general offices until about 1980 and is now one of only two structures left from the mill complex. It is valued both for that industrial history and as a visual landmark.","period_of_significance":null,"architect_builder":"Built by Republic Iron and Steel Company; no architect named","architectural_style":"Classical Revival","criteria":["A","C"],"status_note":"The inventory sheets list the building and the hospital addition as vacant, with exterior condition good. The form also marks the property as endangered.","vacant_flag":true,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:53:14.580524-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_OH/86001940.pdf"},"photo":null,"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71985851","wikipedia":null,"wikidata":null},"indexable":true,"url":"https://nationalhistoricalregister.com/ohio/mahoning-county/republic-iron-and-steel-office-building-86001940/"}