Troy Public Square
Why it's listed
Troy Public Square is the commercial center of the county seat of Miami County, Ohio. Laid out in 1807 and 1808 on the highest ground in town, it was originally a courthouse square and now functions as a traffic circle with a small fountain park. The nominated district takes in buildings facing the Square and the streets running from it. Thirty-three buildings contribute to its character, and seven are classed as intrusions. Most are painted brick, with boxed cornices, friezes and brackets. Key buildings include the Mayo-Harter Building of about 1848, the Buckeye Building of 1847, the Second Empire Coleman-Allen Building, the Dye and Dunlap Buildings of about 1871, the Lollis Hotel of 1854 and the Bee Hive Corner of 1874. Mayo's Hall, Troy's first theater, opened in 1854. The district was listed as an unusually well preserved group of mid-nineteenth-century commercial architecture, with local hopes that its historic character could support the downtown economy.
Significance in brief: The nomination describes the district as a mid-Victorian commercial center, citing a regional survey that calls it one of the best preserved groups of its kind in Ohio. It is significant for architecture, commerce, urban planning, transportation and local history. Troy was laid out as a county seat, and many 1840s to 1880s commercial buildings survive around the Square.
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 75001491, listed June 30, 1975. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence medium).
Key facts
| Address | Property surrounding jct. of Main and Market Sts., Troy |
|---|---|
| County | Miami County |
| Listed | June 30, 1975 |
| Reference number | 75001491 |
| Resource type | District |
| Period of significance | 19th Century |
| Architectural style | Mid-Victorian commercial, including Italianate, Second Empire and Eastlake details |
| Areas of significance | Community Planning and Development, Commerce, Architecture |
| Level of significance | State |
| Status (as stated in the nomination) | Condition is marked excellent but altered. Many storefronts have been modernized. Some buildings are under renovation or threatened, and the Dye Building was recently abandoned by a retail tenant. |
| Acreage | 9.7 |
| Coordinates | 40.03942, -84.20285 (NPS GIS) |
What listing means for this property
This is a historic district. Buildings within its boundary are either contributing (they add to the district's significance) or non-contributing. Owners of contributing income-producing buildings can claim the 20% federal rehabilitation tax credit; homeowners should look at state credits. National Register districts impose no design review by themselves; a local historic district ordinance, if one exists, does (the difference explained).
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 75001491.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q28153361
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.