{"nrhp_refnum":"70000243","name":"Coonley, Avery, House","other_names":[],"category":"building","location":{"address":"290 and 300 Scottswood Rd., 281 Bloomingbank Rd., and 336 Coonley St.","address_restricted":false,"city":"Riverside","county":"Cook County","state":"IL","lat":41.820581865000065,"lon":-87.82867816999999,"geom_source":"nps_gis"},"listed_date":"1970-12-30","is_nhl":true,"nhl_designated_date":"1970-12-30","areas_of_significance":["Architecture"],"significance_levels":["national"],"summary":{"what_it_is":"A large, U-shaped, two-story frame and stucco \"prairie house\" at 300 Scottswood Road (and 281 Bloomingbank Road) in Riverside, Cook County, Illinois, built in 1907-09 and designed by Frank Lloyd Wright for Avery and Mrs. Coonley.","why_significant":"The nomination calls it a culminating masterpiece of Wright's early period (1900-1913) and a summary of his principles of domestic architecture to that date. Its low horizontal lines, overhanging roofs, free-flowing interiors, and blending with its site foreshadowed major trends in house design over the next 60 years. Wright himself judged it the most successful of his houses.","narrative":"Built in 1907-09 in Riverside, Illinois, this large U-shaped house was designed by Frank Lloyd Wright for Avery and Mrs. Coonley. The two-story frame and stucco building has a creamy tan ground story, an upper frieze of bronze, gold and orange tile in geometric patterns, and low roofs with broad eaves shading long rows of casement windows. The ground floor serves largely as a raised basement, while the main rooms occupy the second floor and overlook lawns and gardens. Wright also designed the furniture and fittings, though most of the original furniture has been removed. Around 1960 the house was split into two residences, and the estate was subdivided into four properties, including the gardener's cottage and the stables and garage. Exterior changes were minimal. The house is regarded as a culminating work of Wright's early career and a mature expression of the Prairie style, with design ideas that influenced later houses. It remains in private residential use.","period_of_significance":"1907-09 (20th Century)","architect_builder":"Frank Lloyd Wright","architectural_style":"Prairie style (\"prairie house\")","criteria":[],"status_note":"Both halves are in good condition and used as private residences; the house was divided into two dwellings around 1960 and is not open to visitors.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:35.732612-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/14/8915/28891514/content/electronic-records/rg-079/NPS_IL/70000243_NHL.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/70000243/69de94e2f1-800.webp","url_1600":"https://nationalhistoricalregister.com/media/70000243/69de94e2f1-1600.webp","licence":"CC BY 2.0","author":"davidwilson1949","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Coonley_House,_Riverside,_Illinois_2013_04.jpg\" rel=\"noopener\">davidwilson1949</a>, <a href=\"https://creativecommons.org/licenses/by/2.0\" rel=\"license noopener\">CC BY 2.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Coonley_House,_Riverside,_Illinois_2013_04.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/28891514","wikipedia":"https://en.wikipedia.org/wiki/Coonley_House","wikidata":"https://www.wikidata.org/wiki/Q5167688"},"indexable":true,"url":"https://nationalhistoricalregister.com/illinois/cook-county/coonley-avery-house-70000243/"}