{"nrhp_refnum":"08001096","name":"Frank Lloyd Wright-Prairie School of Architecture Historic District (Boundary Increase)","other_names":[],"category":"district","location":{"address":"Roughly bounded by Division St. on the N., N. Cuyler Ave. on the E., Lake St. on the S. and N. Harlem Ave on the W.","address_restricted":false,"city":"Oak Park","county":"Cook County","state":"IL","lat":41.89505822150005,"lon":-87.79544119369375,"geom_source":"nps_gis"},"listed_date":"2009-05-22","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture"],"significance_levels":["national"],"summary":{"what_it_is":"A large residential historic district in the Village of Oak Park, Cook County, Illinois, covering all or parts of 97 blocks. This documentation expands the boundary of a district first listed in 1973, with buildings dating from about 1860 to 1930.","why_significant":"The district contains the largest concentration of Prairie School architecture in America, including works by Frank Lloyd Wright and other Oak Park architects. It also documents the growth of Oak Park as a Chicago suburb through Victorian, revival, Bungalow and American Foursquare houses.","narrative":"Oak Park, directly west of Chicago, grew from a railroad community in the 1840s into a residential suburb. This historic district takes in all or parts of 97 blocks bounded roughly by Division Street, Harlem Avenue, Ontario and Lake Streets, and Ridgeland Avenue. Most of its buildings are two-story single-family houses built between about 1860 and 1930, with apartment buildings near the rail line, two commercial clusters, churches, a high school and Austin Gardens park. Italianate houses give way to Queen Anne, then Colonial and Tudor Revival, Bungalow and American Foursquare designs. The district is best known for Prairie School architecture. Frank Lloyd Wright's home and studio was the center of that movement's development, and Oak Park holds works by Wright, Eben E. Roberts, Tallmadge and Watson, and John S. Van Bergen. A 2007 survey identified 1,727 of 1,934 primary buildings as contributing, supporting the expanded boundary.","period_of_significance":null,"architect_builder":"Frank Lloyd Wright; Eben E. Roberts; Tallmadge and Watson; John S. Van Bergen (among others named in the description)","architectural_style":"Late Victorian (Italianate, Queen Anne, Stick, Eastlake, Shingle, Romanesque); Late 19th and 20th Century Revivals (Colonial, Tudor, Beaux Arts); Late 19th and Early 20th Century American Movements (Prairie, Bungalow, Craftsman)","criteria":[],"status_note":"Residential blocks remain largely intact and the district continues to be used as a dense residential community with commercial areas, churches and schools.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:37.560649-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/30/8920/28892030/content/electronic-records/rg-079/NPS_IL/08001096.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/08001096/7fc51af52f-800.webp","url_1600":"https://nationalhistoricalregister.com/media/08001096/7fc51af52f-1600.webp","licence":"CC BY 2.5","author":"IvoShandor","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Oak_Park_Il_Balch_House2.jpg\" rel=\"noopener\">IvoShandor</a>, <a href=\"https://creativecommons.org/licenses/by/2.5\" rel=\"license noopener\">CC BY 2.5</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Oak_Park_Il_Balch_House2.jpg"},"district":{"nrhp_refnum":"73000699","name":"Frank Lloyd Wright-Prairie School of Architecture Historic District","url":"https://nationalhistoricalregister.com/districts/illinois/frank-lloyd-wright-prairie-school-of-architecture-historic-district-73000699/"},"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/28892030","wikipedia":"https://en.wikipedia.org/wiki/Frank_Lloyd_Wright%E2%80%93Prairie_School_of_Architecture_Historic_District","wikidata":"https://www.wikidata.org/wiki/Q5487991"},"indexable":true,"url":"https://nationalhistoricalregister.com/illinois/cook-county/frank-lloyd-wright-prairie-school-of-architecture-historic-district-boundary-inc-08001096/"}