{"nrhp_refnum":"75001335","name":"Tytus, John B., House","other_names":[],"category":"building","location":{"address":"300 S. Main St.","address_restricted":false,"city":"Middletown","county":"Butler County","state":"OH","lat":39.51329102200003,"lon":-84.39678649899997,"geom_source":"nps_gis"},"listed_date":"1975-05-27","is_nhl":true,"nhl_designated_date":"1976-05-11","areas_of_significance":["Architecture","Invention"],"significance_levels":["national"],"summary":{"what_it_is":"A red brick residence at 300 South Main Street in Middletown, Butler County, Ohio, built in 1868 with a kitchen addition in 1890. It has a rear brick carriage house and combines Romanesque and Tudor revival elements.","why_significant":"The house is nominated chiefly as the childhood and later-life home of John Butler Tytus (1875-1944), inventor of the continuous \"hot strip\" rolling mill. The form calls this the most important advance in the steel industry in the 20th century. It is also noted as architecturally interesting.","narrative":"This red brick house at 300 South Main Street in Middletown, Ohio, was built in 1868 and extended at the rear in 1890. L-shaped in plan, it mixes Romanesque and Tudor revival details: a shed-roofed front porch with large arched openings, a three-sided bay with a short conical roof, intersecting gables, an elliptical dormer and leaded glass windows. Inside, original oak paneling, a grand stairway, a barrel vaulted dining room and Eastlake furniture once owned by the family survive. A two-story brick carriage house at the rear echoes the style. The property is important as the home of John Butler Tytus, a Yale graduate who worked at Armco and developed the continuous wide-strip rolling mill, first successful at Ashland, Kentucky, in 1921. Within a decade, the steel industry had invested half a billion dollars in such mills. Tytus received Armco's Distinguished Service Award in 1926 and the Gary Memorial Award in 1935.","period_of_significance":"19th Century (specific dates 1868, 1890)","architect_builder":null,"architectural_style":"Romanesque and Tudor revival elements (data sheet also lists Queen Anne)","criteria":[],"status_note":"Occupied as a private residence; the owners operate a small shop in the front room. The brick carriage house is in fair condition and the wooden barn portion is badly deteriorated.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:53:10.415663-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_OH/75001335.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/75001335/7c44fdc90c-800.webp","url_1600":"https://nationalhistoricalregister.com/media/75001335/7c44fdc90c-1600.webp","licence":"Public domain","author":"Nyttend","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:John_B._Tytus_House.jpg\" rel=\"noopener\">Nyttend</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:John_B._Tytus_House.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71986971","wikipedia":"https://en.wikipedia.org/wiki/John_B._Tytus_House","wikidata":"https://www.wikidata.org/wiki/Q14716538"},"indexable":true,"url":"https://nationalhistoricalregister.com/ohio/butler-county/tytus-john-b-house-75001335/"}