{"nrhp_refnum":"70000240","name":"Unity Temple","other_names":["Unity Church"],"category":"building","location":{"address":"875 Lake St.","address_restricted":false,"city":"Oak Park","county":"Cook County","state":"IL","lat":41.88833632300003,"lon":-87.79680717499997,"geom_source":"nps_gis"},"listed_date":"1970-04-17","is_nhl":true,"nhl_designated_date":"1970-12-30","areas_of_significance":["Architecture"],"significance_levels":["national"],"summary":{"what_it_is":"Unity Temple is a monolithic concrete church at 875 Lake Street in Oak Park, Cook County, Illinois, designed by Frank Lloyd Wright and dated to 1906. It consists of a concrete cube temple and a lower rectangular section known as Unity House, joined by a connecting room.","why_significant":"The nomination holds that Unity Temple is a major structure in the early development of modern architecture and one of the earliest monolithic concrete buildings. It marks a milestone in the career of Frank Lloyd Wright, who was at the height of his creative powers, and is cited by authorities as one of the four or five most significant buildings of his 70-year career.","narrative":"Unity Temple, at 875 Lake Street in Oak Park, Illinois, is a church designed by Frank Lloyd Wright and dated to 1906. It is one of the earliest monolithic concrete buildings ever built. The complex is effectively two buildings on one site joined by a connecting room: a concrete cube containing the temple, lit mainly by roof skylights and small leaded windows high on the walls, and a lower rectangular wing known as Unity House. Wooden forms were reused on every face, so the ornamentation is uniform throughout, and it departs from the features once associated with religious architecture. The building is considered a milestone of Wright's career, created when his creative powers were at their height, and authorities have ranked it among his four or five most important works. The same congregation has used it since it was built. At the time of listing it was structurally sound but needed restoration, especially a new roof, and a foundation grant was supporting that work.","period_of_significance":"1906","architect_builder":"Frank Lloyd Wright","architectural_style":null,"criteria":[],"status_note":"Described as structurally sound but in need of considerable restoration, chiefly a new roof. It has been occupied by the same congregation since construction and is open to the public nearly all the time.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:34.564675-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/31/8925/28892531/content/electronic-records/rg-079/NPS_IL/70000240.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/70000240/9c6980b739-800.webp","url_1600":"https://nationalhistoricalregister.com/media/70000240/9c6980b739-1600.webp","licence":"CC BY 2.5","author":"IvoShandor","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Oak_Park_Il_Unity_Temple9.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_Unity_Temple9.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/28892531","wikipedia":"https://en.wikipedia.org/wiki/Unity_Temple","wikidata":"https://www.wikidata.org/wiki/Q1680814"},"indexable":true,"url":"https://nationalhistoricalregister.com/illinois/cook-county/unity-temple-70000240/"}