{"nrhp_refnum":"82003404","name":"Union Mill Complex","other_names":["Bischoff's Chocolate Factory"],"category":"building","location":{"address":"NY 50, Milton Ave.","address_restricted":false,"city":"Ballston Spa","county":"Saratoga County","state":"NY","lat":43.00890389050005,"lon":-73.85106385502036,"geom_source":"nps_gis"},"listed_date":"1982-06-17","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Industry","Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"An industrial complex on a four-acre site along Milton Avenue (NY Route 50) in Ballston Spa, Saratoga County, New York. It includes the Union Mill (1879), the George West Office Building (1884) and the West Bag Factory (ca. 1850), plus the ruins of the Blue Mill Dam.","why_significant":"The complex is presented as a significant example of late nineteenth century industrial architecture and as the headquarters of George West's papermaking enterprise in Saratoga County. West was among the first paper bag manufacturers in the United States, and the mill was Ballston Spa's principal employer for over thirty years. The buildings combine Italianate, Second Empire and Queen Anne elements, and the office interior survives largely intact.","narrative":"Along Milton Avenue in Ballston Spa, a cluster of brick industrial buildings occupies a four-acre wedge beside the Kayaderosseras Creek. The Union Mill, built in 1879 on the site of a burned cotton mill, is a four-story T-shaped structure with two mansard-roofed towers decorated in metal. Nearby are the West Bag Factory, dating from about 1850, and the George West Office Building of 1884, whose Queen Anne interior by architect R. Newton Brezee retains oak and cherry woodwork, a cashier's desk and a walk-in vault. George West, an early paper bag manufacturer, ran a network of mills from this headquarters, and the mill was the town's leading employer for over thirty years. In 1919 the mill was sold to Frederick Bischoff, Inc., and converted to chocolate production, which brought concrete floors and removal of paper machinery. The Blue Mill Dam, demolished around 1947, survives only as ruins. The complex was listed for its architecture and industrial history.","period_of_significance":"1850-1886","architect_builder":"N. R. Vanderburgh, R. Newton Brezee","architectural_style":"Second Empire (Union Mill), Queen Anne (office building), Italianate elements (bag factory)","criteria":[],"status_note":"The Union Mill is used as a warehouse by a local manufacturing firm. The bag factory and office building are vacant, with rehabilitation of the office planned. The office building is described as deteriorated but not significantly altered.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:41.980325-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/82003404.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/82003404/205157796e-800.webp","url_1600":"https://nationalhistoricalregister.com/media/82003404/205157796e-1600.webp","licence":"CC BY-SA 3.0","author":"Daniel Case","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Union_Mill_Complex.jpg\" rel=\"noopener\">Daniel Case</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:Union_Mill_Complex.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75321639","wikipedia":"https://en.wikipedia.org/wiki/Union_Mill_Complex","wikidata":"https://www.wikidata.org/wiki/Q7885836"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/saratoga-county/union-mill-complex-82003404/"}