{"nrhp_refnum":"11000850","name":"Ottawa Commercial Historic District","other_names":[],"category":"district","location":{"address":"Roughly 600-1129 Columbus St., 601-1215 LaSalle St.","address_restricted":false,"city":"Ottawa","county":"LaSalle County","state":"IL","lat":41.35158323700006,"lon":-88.8431775151646,"geom_source":"nps_gis"},"listed_date":"2011-11-22","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Commerce","Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"A commercial historic district covering the central business district of Ottawa, La Salle County, Illinois, about 65 acres across twenty-six blocks between the Illinois River and the former Illinois and Michigan Canal. It holds 149 contributing and 40 noncontributing resources, mostly buildings dating from the 1830s to the early 1960s.","why_significant":"The district is presented as the commercial and social center of Ottawa from 1831 through 1962. It developed from the city's founding as a stop on the I&M Canal into a commercial and transportation hub for north-central Illinois. Its buildings show nearly every popular Midwest architectural style and retain good overall integrity.","narrative":"Ottawa's central business district sits where the Illinois and Fox Rivers meet, platted in 1829 as the terminus of the Illinois and Michigan Canal. The historic district spans about 65 acres and twenty-six blocks, with attached brick storefronts around the courthouse square and a mix of commercial, civic, religious and residential buildings extending north toward the former canal. Italianate buildings predominate, alongside Romanesque Revival, Gothic Revival, Classical Revival, Art Deco and International Style examples. Highlights include the Reddick Mansion, the Appellate Court Building, the County Court House, the Roxy Theater and the 1913 Central Life Building. Many storefronts were modernized in the early twentieth century, and those changes are treated as part of the district's story. The area is recognized as the commercial and social center of the city from 1831 through 1962, and most of its buildings retain their original massing and character-defining features.","period_of_significance":"1831-1962","architect_builder":"Jason Richardson Jr. (architect of the Central Life Building, 628 Columbus Street)","architectural_style":"Late Victorian: Italianate; Late 19th/Early 20th Century Commercial Style; Modern Movement (Modern, International Style); Late 19th/Early 20th Century Revivals: Classical","criteria":[],"status_note":"Buildings are described as generally in good condition and retaining adequate integrity; many remain in commercial, government, social and religious use.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:37.802764-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/19/8934/28893419/content/electronic-records/rg-079/NPS_IL/11000850.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/11000850/57a2dca85d-800.webp","url_1600":"https://nationalhistoricalregister.com/media/11000850/57a2dca85d-1600.webp","licence":"CC BY-SA 3.0","author":"IvoShandor","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Ottawa_IL_Downtown1.jpg\" rel=\"noopener\">IvoShandor</a>, <a href=\"https://creativecommons.org/licenses/by-sa/3.0\" rel=\"license noopener\">CC BY-SA 3.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Ottawa_IL_Downtown1.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/28893419","wikipedia":"https://en.wikipedia.org/wiki/Ottawa_Commercial_Historic_District","wikidata":"https://www.wikidata.org/wiki/Q46999911"},"indexable":true,"url":"https://nationalhistoricalregister.com/illinois/lasalle-county/ottawa-commercial-historic-district-11000850/"}