{"nrhp_refnum":"85001785","name":"Wrigley, William, Jr., Summer Cottage","other_names":["Mt. Ada"],"category":"building","location":{"address":"76 Wrigley Rd.","address_restricted":false,"city":"Avalon","county":"Los Angeles County","state":"CA","lat":33.34105539600006,"lon":-118.32112739099995,"geom_source":"nps_gis"},"listed_date":"1985-08-15","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Landscape Architecture","Architecture"],"significance_levels":["state"],"summary":{"what_it_is":"A hillside summer estate on Santa Catalina Island at 76 Wrigley Road, Avalon, California, known as Mt. Ada. Built in 1921, it includes a Colonial Revival main residence, servants' quarters, a garage and landscaped grounds.","why_significant":"The nomination argues the estate is the finest residential and garden complex on Santa Catalina Island, with high architectural quality and integrity. It was the vacation home of William Wrigley Jr. and his wife, and was visited by Presidents Coolidge and Hoover, earning the name \"Summer White House\". It is also the finest surviving residence designed by architect David M. Renton.","narrative":"Mt. Ada is a hillside estate about 350 feet above sea level, overlooking Avalon and its bay on Santa Catalina Island. Built in 1921 for William Wrigley Jr. and his wife as a summer residence, it has a two-story, L-shaped, wood-frame main house with stucco exterior and Colonial Revival details. Servants' quarters and a garage sit nearby, and terraced, irrigated gardens surround the buildings. The nomination describes it as the finest residential and garden complex on the island. David M. Renton served as chief architect, Captain A.B. Waddingham as engineer, and Albert Conrad as landscape architect. Wrigley, a chewing gum magnate and owner of the Chicago Cubs, hosted Presidents Calvin Coolidge and Hoover here, and the house became known as the \"Summer White House\". The estate was opened to the public after Mrs. Wrigley's death in 1958 and donated to the University of Southern California in 1978. Its main buildings remain largely unaltered and it is a local landmark.","period_of_significance":"1921","architect_builder":"A.B. Waddingham/ David M. Renton","architectural_style":"Colonial Revival","criteria":[],"status_note":"Described as in good condition and virtually unaltered, apart from the garage, which was converted to living quarters in the 1950s. It was donated to the University of Southern California in 1978.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:54:27.788522-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_CA/85001785.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/85001785/7ce3c939e0-800.webp","url_1600":"https://nationalhistoricalregister.com/media/85001785/7ce3c939e0-1600.webp","licence":"Public domain","author":"Jack Boucher","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:WrigleyHouse.jpg\" rel=\"noopener\">Jack Boucher</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:WrigleyHouse.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/123859640","wikipedia":"https://en.wikipedia.org/wiki/William_Wrigley_Jr._Summer_Cottage","wikidata":"https://www.wikidata.org/wiki/Q14684268"},"indexable":true,"url":"https://nationalhistoricalregister.com/california/los-angeles-county/wrigley-william-jr-summer-cottage-85001785/"}