Baumgardner, William, House and Farm Buildings
Also known as: Hopper House and Farm Buildings
Why it's listed
This five-acre farm on the south side of National Road, east of New Carlisle, preserves a nearly complete set of agricultural buildings from about 1857. William Baumgardner, a prosperous farmer whose family came from Pennsylvania in 1835, built the complex. The two-story brick house is T-shaped, with a three-bay facade, sidelights and transom at the entrance, and a bracketed porch. Behind it stand a frame summer kitchen with an exterior bake oven, a large barn, a carriage house, a brick springhouse with diamond-pattern vents, a seed barn and a granary. All remain in their original locations. Small gables and cupolas repeat across the buildings and tie them together visually. Some outbuildings are in poor condition, and the summer kitchen was sided and altered in 1975. The property was listed because it is one of the most complete mid-19th century farm complexes in southwest Ohio. David Mann bought it around 1870, and his family held it until the 1940s.
Significance in brief: The complex is described as an excellent collection of mid-19th century agricultural structures and one of the most complete farm complexes in southwest Ohio. The house has an excellent early interior and good proportions, and repeated small gables and cupolas give the property visual unity. It is listed under agriculture and architecture.
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 78002141, listed February 17, 1978. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence high).
Key facts
| Address | 8390 National Rd., New Carlisle |
|---|---|
| County | Miami County |
| Listed | February 17, 1978 |
| Reference number | 78002141 |
| Resource type | Building |
| Period of significance | Ca. 1857 |
| Architect / builder | William Baumgardner |
| Areas of significance | Architecture, Agriculture |
| Level of significance | State |
| Status (as stated in the nomination) | House in good repair; outbuildings not well preserved, with the granary very dilapidated and the summer kitchen altered by siding in 1975. Form lists the property as occupied private residence. |
| Acreage | 5 |
| Coordinates | 39.90620, -84.05967 (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 78002141.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q14716948
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.