Mott Mill
Also known as: 11-23 Casimir Avenue
Why it's listed
Two linked mill buildings at 11-23 St. Casimir Avenue in Yonkers record more than a century of industry along the Nepperhan River. William P. Mott, a carpenter and builder, constructed the first in 1852 of coursed gray fieldstone, with a marble plaque naming him and the date. It first served as a cotton factory, then housed George B. Skinner's silk works for about three decades, and later was used by the Alexander Smith Carpet Company. In 1906 the Ferro Concrete Company of Baltimore added a large reinforced concrete building to its north, a 'daylight factory' with big windows between concrete columns. Carpet production in Yonkers ended in 1954, and later tenants included a laundry and other manufacturers. After falling into disrepair and suffering fires in the 1990s, the complex was converted into senior housing. It was listed for its link to the local textile industry, for the rare stone mill, and for the early concrete factory.
Significance in brief: The property is tied to the Yonkers textile industry, especially the Alexander Smith Carpet Company. The 1852 building is argued to be an excellent and uncommon example of a mid-nineteenth century banked stone mill. The 1906 structure is cited as an early and intact reinforced concrete industrial building in Westchester County.
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 03001519, listed January 28, 2004. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence high).
Key facts
| Address | 11-23 St. Casimir Ave., Yonkers |
|---|---|
| County | Westchester County |
| Listed | January 28, 2004 |
| Reference number | 03001519 |
| Resource type | Building |
| Period of significance | 1852-1954 |
| Architect / builder | Mott, William P. (1852 building); Ferro Concrete Company (1906 building) |
| Architectural style | Mid-19th century industrial; Early 20th century industrial |
| Criteria |
|
| Areas of significance | Architecture, Commerce, Industry |
| Level of significance | Local |
| Status (as stated in the nomination) | Both buildings were converted to affordable housing for the elderly in 2001-02 and are largely intact. |
| Acreage | 1.5 |
| Coordinates | 40.93472, -73.89356 (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 03001519.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q14707020
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.