Boldt, George C., Yacht House
Why it's listed
Rising on the northeast shore of Wellesley Island in the Thousand Islands, this sprawling 1903 yacht house combines five linked parts: a circular tower with reception rooms, three central yacht bays, a large east service bay, an office and storage wing with a crenelated tower, and a caretaker's residence. The central bay measures 160 feet long. The towers and service wings are wood frame, while the bays use prefabricated steel trusses, all sheathed in weathered shingles. Inside, the tower has oak ceilings, carved stair balusters and stone fireplaces, and the main bay has an overhead crane and screw jacks for lifting vessels. Hotel magnate George C. Boldt commissioned the Philadelphia firm Hewitt and Hewitt to design it, echoing the towers and gables of his unfinished mansion on Heart Island. It is valued as a monumental example of Shingle Style resort architecture and has served yachting uses, later under the Thousand Islands Club, ever since.
Significance in brief: It is presented as an important and monumental example of Shingle Style resort architecture, with an unusually eclectic range of forms, motifs and materials. It was designed by the Philadelphia firm Hewitt and Hewitt for hotel magnate George C. Boldt. It has been in continuous use as a marine service facility and clubhouse since 1903, which adds to its value as a reminder of the American 'Age of Opulence'.
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 78001853, listed April 26, 1978. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence high).
Key facts
| Address | NW of Alexandria Bay on Wellesley Island, Alexandria Bay |
|---|---|
| County | Jefferson County |
| Listed | April 26, 1978 |
| Reference number | 78001853 |
| Resource type | Building |
| Period of significance | 1900- |
| Architect / builder | Hewitt and Hewitt |
| Architectural style | Shingle Style |
| Areas of significance | Entertainment/Recreation, Architecture |
| Level of significance | Local |
| Status (as stated in the nomination) | Occupied and still used as a marine service facility and clubhouse; the form describes it as unaltered and on its original site, though the original wood roof shingles were replaced with asphalt. |
| Acreage | 1 |
| Coordinates | 44.34646, -75.92668 (NPS GIS) |
What listing means for this property
National Register listing is honorary for a privately owned home: it does not by itself restrict what an owner may do with their own money, and it does not require public access. Restrictions come from local landmark or historic-district ordinances, which are separate (how they differ).
Owner-occupied houses are not eligible for the 20% federal rehabilitation tax credit, which applies to income-producing buildings, but many states offer credits for homeowners. Listing also opens the door to preservation easements and to buying a plaque. Start with what listing means for homeowners, renovating a listed house and selling one.
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 78001853.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q5537538
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.