{"nrhp_refnum":"08000082","name":"Hall of Transportation, Treasure Island","other_names":["Building 2"],"category":"building","location":{"address":"SE Side of California Ave. between Aves. D & F","address_restricted":false,"city":"Treasure Island","county":"San Francisco","state":"CA","lat":37.817897463000065,"lon":-122.36833707199997,"geom_source":"nps_gis"},"listed_date":"2008-02-26","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture","Entertainment/Recreation"],"significance_levels":["state"],"summary":{"what_it_is":"Building 2, the former Hall of Transportation of the 1939-1940 Golden Gate International Exposition, is a large reinforced concrete seaplane hangar on Treasure Island in San Francisco Bay. It was completed by mid-1938 on the island built by the Army Corps of Engineers.","why_significant":"The nomination argues it is one of the best remaining buildings from the 1939-40 Golden Gate International Exposition and one of two hangars built for a planned San Francisco airport (Criterion A). It is also a highly successful example of late-1930s Art Moderne commercial architecture (Criterion C), and it retains integrity to the 1938-1940 period.","narrative":"Building 2 on Treasure Island is a large reinforced concrete hangar completed by mid-1938, built beside the artificial island created by the Army Corps of Engineers. It served as the Hall of Transportation at the 1939-1940 Golden Gate International Exposition, where it housed Pan American Airways exhibits, aircraft displays and an overhead observation platform. The building was one of two hangars meant for a planned San Francisco airport and was designed in the Streamline or Art Moderne style by architects George Kelham and William Day. Its open three-hinge riveted steel arch truss is anchored by four tapered concrete pylons, and the structure is about 80 feet tall. Damage from the 1989 Loma Prieta earthquake led to structural changes in 1992, including a rehabilitated southwest facade that closely resembles the original 1936 design. It is listed for its association with the Exposition and as an example of late-1930s Art Moderne architecture, with significance spanning 1938 to 1940.","period_of_significance":"1938-1940","architect_builder":"Day, William Peyton; Kelham, George William","architectural_style":"Modern Movement: Art Moderne/Streamline","criteria":["A","C"],"status_note":"Currently used for commerce/office functions; the hangar door area has been infilled and the southwest facade rehabilitated after Loma Prieta earthquake damage in 1989 (modifications in 1992).","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:54:29.51327-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_CA/08000082.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/08000082/40e28ecc8b-800.webp","url_1600":"https://nationalhistoricalregister.com/media/08000082/40e28ecc8b-1600.webp","licence":"CC BY-SA 3.0","author":"Sanfranman59","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Hall_of_Transportation,_Treasure_Island_(San_Francisco).JPG\" rel=\"noopener\">Sanfranman59</a>, <a href=\"https://creativecommons.org/licenses/by-sa/3.0\" rel=\"license noopener\">CC BY-SA 3.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Hall_of_Transportation,_Treasure_Island_(San_Francisco).JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/123861149","wikipedia":"https://en.wikipedia.org/wiki/Hall_of_Transportation,_Treasure_Island","wikidata":"https://www.wikidata.org/wiki/Q5642717"},"indexable":true,"url":"https://nationalhistoricalregister.com/california/san-francisco/hall-of-transportation-treasure-island-08000082/"}