{"nrhp_refnum":"89002113","name":"Contra Costa County Courthouse Block","other_names":["Finance Building"],"category":"district","location":{"address":"625 Court St.","address_restricted":false,"city":"Martinez","county":"Contra Costa County","state":"CA","lat":38.01930907900004,"lon":-122.13416597699995,"geom_source":"nps_gis"},"listed_date":"1989-12-28","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Politics/Government","Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"A one-block civic district at 625 Court Street in Martinez, California, made up of the 1901 Contra Costa County Courthouse, the 1901 county jail and a low granite curbing, with a 1944 jail annex that does not contribute.","why_significant":"The block was the center of county government from 1901 until the courts moved to the Hall of Records in 1933. It is also a very good example of early 20th century Classical Revival public architecture in the county. The courthouse was designed by Havens & Toepke and the jail by William S. Mosser.","narrative":"Occupying a full city block in Martinez, this complex centers on a 1901 courthouse faced in rough-cut Vermont granite, with a two-story Ionic portico reached by a monumental flight of steps. A smaller granite jail built the same year sits nearby, along with a low rounded granite curbing that surrounds the block. A concrete and steel jail annex was added in 1944. The courthouse once carried a steel dome, removed in 1957 after earthquake damage, though the roofline was unchanged. Contra Costa County built the complex after the earlier courthouse was condemned and Martinez narrowly kept its status as county seat. The buildings were meant to look permanent and imposing, and they served as the county government headquarters until the courts moved to the Hall of Records in 1933. Later the courthouse became the Finance Building. The designs came from the San Francisco firm Havens & Toepke for the courthouse and William S. Mosser for the jail. The complex is recognized for its government role and its Classical Revival architecture.","period_of_significance":"1901-1939","architect_builder":"Havens & Toepke; Mosser, William S., & Son","architectural_style":"Classical Revival; Beaux Arts","criteria":["A","C"],"status_note":"The 1901 courthouse, renamed the Finance Building in 1966, still houses county finance offices. The jail now stores county records, and its prisoners were removed after a new facility opened in 1981.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:54:26.798668-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_CA/89002113.pdf"},"photo":null,"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/123858514","wikipedia":null,"wikidata":null},"indexable":true,"url":"https://nationalhistoricalregister.com/california/contra-costa-county/contra-costa-county-courthouse-block-89002113/"}