Cooke, Jay, House
Why it's listed
Gibraltar Island in Lake Erie, off Put-in-Bay, holds a three-story, 15-room house completed in 1865 for the financier Jay Cooke. Built in the High Victorian Italianate manner, it is dominated by an octagonal Gothic-style tower with a dome and crenelations, and its windows are framed by hood mouldings under large ornamental brackets. Inside, the library retains carved bookcases, and the parlor has a marble fireplace. Cooke, born in Sandusky, sold enormous quantities of government bonds during the Civil War, helping the Union finance the conflict. He used the island as a summer retreat from 1865 until 1904, except for 1873 to 1880, when he lost the property after his firm failed. Since 1925 Ohio State University's Stone Laboratory has operated on the island, and the house serves as a men's dormitory. Apart from a frame addition at the rear, it remains largely as built.
Significance in brief: The house is tied to Jay Cooke, the Civil War financier who raised huge sums for the Union through bond sales. The island estate was his beloved summer retreat, which he visited from 1865 until 1904 apart from 1873-1880. The form also notes its distinctive Italianate and Gothic detailing.
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 66000620, listed November 13, 1966. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence high).
Key facts
| Address | Put-in-Bay, Lake Erie, Gibraltar Island |
|---|---|
| County | Ottawa County |
| Listed | November 13, 1966 |
| Reference number | 66000620 |
| Resource type | Building |
| Period of significance | 1865-1904 |
| Architectural style | High Victorian Italianate |
| Areas of significance | Industry, Commerce |
| Level of significance | National |
| National Historic Landmark | Yes, designated November 13, 1966 |
| Status (as stated in the nomination) | Used by Ohio State University as the men's dormitory for the Stone Laboratory; the form lists the property as occupied and in good condition, largely unchanged apart from a rear frame addition. |
| Acreage | 8 |
| Coordinates | 41.65814, -82.82094 (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 66000620.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q6166507
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.