Union Mill Complex
Also known as: Bischoff's Chocolate Factory
Why it's listed
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.
Significance in brief: 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.
Machine-generated summary. This summary was generated by a language model from the official nomination document and has not been reviewed line by line by an editor. It may contain errors. Check the source document before relying on any detail. Source: nomination document (PDF) · National Archives catalog entry. NRHP reference 82003404, listed June 17, 1982. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence high).
Key facts
| Address | NY 50, Milton Ave., Ballston Spa |
|---|---|
| County | Saratoga County |
| Listed | June 17, 1982 |
| Reference number | 82003404 |
| Resource type | Building |
| 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) |
| Areas of significance | Industry, Architecture |
| Level of significance | Local |
| Status (as stated in the nomination) | 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. |
| Acreage | 4 |
| Coordinates | 43.00890, -73.85106 (NPS GIS) |
What listing means for this property
For an income-producing building, listing (individually or as a contributing building in a district) is the gateway to the 20% federal rehabilitation tax credit on qualified rehabilitation costs, often stackable with state credits. Work claiming the credit must follow the Secretary of the Interior's Standards and be approved in advance.
Listing does not restrict a private owner acting without federal money or permits; where federal funding or licensing is involved, Section 106 review applies.
General information, not legal or tax advice. Rules change; confirm with your State Historic Preservation Office or a qualified adviser.
Sources and further reading
- National Park Service, National Register of Historic Places database (snapshot May 2026), reference 82003404.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q7885836
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.