{"nrhp_refnum":"72000466","name":"Denkmann-Hauberg House","other_names":["Hauberg Civic Center"],"category":"building","location":{"address":"1300 24th St.","address_restricted":false,"city":"Rock Island","county":"Rock Island County","state":"IL","lat":41.49266954650005,"lon":-90.5734760687435,"geom_source":"nps_gis"},"listed_date":"1972-12-26","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Landscape Architecture","Architecture","Social History"],"significance_levels":["national"],"summary":{"what_it_is":"A large brick mansion and carriage house on ten landscaped acres overlooking the Mississippi River valley at 1300 24th Street, Rock Island, Illinois. Begun in 1909 and finished in 1911, it was designed by Prairie School architect Robert C. Spencer for Suzanne Denkmann.","why_significant":"The nomination argues the house is one of the largest residences in Robert Spencer's mature early modern style. Spencer was a close friend of Frank Lloyd Wright and shared his aim of reforming American architecture. It also cites the house's high aesthetic quality in composition and detail, and its link to a prominent Rock Island social and welfare leader.","narrative":"Set at the brow of a hill above the Mississippi River valley, this Rock Island mansion and its large carriage house sit on ten landscaped acres. Begun in 1909 for Suzanne Denkmann, daughter of a wealthy lumber family, it was finished in 1911, just as she and her husband, John Henry Hauberg, moved in. Prairie School architect Robert C. Spencer, a close friend of Frank Lloyd Wright, designed it in solid brick with cream-colored stucco, an irregular plan and ornament based on abstracted plant forms, including her favorite flower, the tulip. Jens Jensen laid out the grounds as a native woodland of birches and evergreens. Niedeken and Wallbridge executed the interiors. The nomination ranks it among the largest residences in Spencer's mature style and notes its aesthetic quality and its association with a prominent civic and welfare leader. The Hauberg heirs gave it to the city in 1956, and it opened as a civic center in 1957.","period_of_significance":"1909","architect_builder":"Robert C. Spencer (architect); Jens Jensen (landscape architect); interiors executed by Niedeken and Wallbridge","architectural_style":"Prairie School / early modern architecture","criteria":[],"status_note":"Owned by the City of Rock Island and used as the Hauberg Civic Center; occupied, with tours by appointment. Condition marked as good.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:34.505403-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/73/8939/28893973/content/electronic-records/rg-079/NPS_IL/72000466.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/72000466/27223bd499-800.webp","url_1600":"https://nationalhistoricalregister.com/media/72000466/27223bd499-1600.webp","licence":"CC0","author":"Smallbones","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Denkmann_Hauberg_RI_IL.jpg\" rel=\"noopener\">Smallbones</a>, <a href=\"http://creativecommons.org/publicdomain/zero/1.0/deed.en\" rel=\"license noopener\">CC0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Denkmann_Hauberg_RI_IL.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/28893973","wikipedia":"https://en.wikipedia.org/wiki/Denkmann-Hauberg_House","wikidata":"https://www.wikidata.org/wiki/Q5257899"},"indexable":true,"url":"https://nationalhistoricalregister.com/illinois/rock-island-county/denkmann-hauberg-house-72000466/"}