{"nrhp_refnum":"71000656","name":"Mahoning Avenue Historic District","other_names":["See Also:Mahoning Avenue Historic District (Boundary Increas"],"category":"district","location":{"address":"241-391 Mahoning Ave., NW.","address_restricted":false,"city":"Warren","county":"Trumbull County","state":"OH","lat":41.23841480700003,"lon":-80.82209233899994,"geom_source":"nps_gis"},"listed_date":"1971-10-26","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Politics/Government","Architecture"],"significance_levels":["state"],"summary":{"what_it_is":"A four-building historic district of 19th-century mansions on a bluff along Mahoning Avenue NW in Warren, Trumbull County, Ohio, northwest of the county courthouse square. The buildings date from 1828, 1832 and 1871.","why_significant":"The nomination calls it the finest assemblage of historically and architecturally important structures in Trumbull County and one of Ohio's few largely unchanged \"Millionaires' Rows.\" The houses span the Federal through Victorian periods and are tied to prominent political and business figures, including Leicester King, Frederick Kinsman and Henry B. Perkins. Several presidents and national political figures visited them.","narrative":"Mahoning Avenue Historical Area is a group of four mansions on a bluff above the Mahoning River, just northwest of Warren's courthouse square. Once part of a grand boulevard of large homes, the row survives as one of Ohio's few largely unchanged \"Millionaires' Rows.\" The Smith House, built in 1828 by master builder Isaac Ladd for merchant and state senator Leicester King, is Federal in style. The Kinsman House, a Greek Revival brick mansion of 1832, stands beside Frederick Kinsman's small law and land office. The Perkins House, an 1871 Italianate residence, hosted Grant, Garfield, Hayes, Harrison and McKinley. Together the buildings show the builder's art from the Federal through the Victorian periods and reflect Warren's political, business and social life. Most now serve public purposes, including county offices and city hall, and the grounds still hold some exotic plantings and green space.","period_of_significance":"19th Century (specific dates 1828, 1832 & 1871)","architect_builder":"Isaac Ladd (master builder of the Smith House); Perkins House architect unknown","architectural_style":"Federal (Smith House), Greek Revival (Kinsman House and Law Office), Victorian Italianate (Perkins House)","criteria":[],"status_note":"Kinsman House under restoration for county offices and preservation association use; Kinsman Law and Land Office and Perkins House (Warren City Hall) in public use; Smith House altered but restorable and in private office use.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:53:09.145294-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_OH/71000656.pdf"},"photo":null,"district":{"nrhp_refnum":"78003115","name":"Mahoning Avenue Historic District (Boundary Increase)","url":"https://nationalhistoricalregister.com/districts/ohio/mahoning-avenue-historic-district-boundary-increase-78003115/"},"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71991699","wikipedia":null,"wikidata":null},"indexable":true,"url":"https://nationalhistoricalregister.com/ohio/trumbull-county/mahoning-avenue-historic-district-71000656/"}