Cincinnati Observatory Building
Also known as: See Also:Observatory Historic District
Why it's listed
Built between 1873 and 1875 on a high point in Cincinnati's Mt. Lookout neighborhood, this two-story brick observatory was designed by architect Samuel Hannaford. It replaced the earlier observatory on Mt. Adams, which operated from 1843 to 1872 under the Cincinnati Astronomical Society. Growing pollution and light problems near the city basin prompted the move, and John Kilgour donated a four-acre tract and $10,000 toward the new building. Operation passed to the University of Cincinnati in 1873. The symmetrical building has classical detailing, including a projecting central portico with Corinthian columns and a pediment with a circular window. A ribbed metal dome painted silver sits on a square brick base and replaced an earlier flat observation tower. The telescope pier extends 17 feet below ground, and the interior walls beneath the dome are independent of the building to reduce vibration. A 12-inch telescope bought in 1843 was used until a 16-inch instrument arrived in 1902.
Significance in brief: It was built to house the Cincinnati Observatory after the move from Mt. Adams, which had been driven by growing pollution and light problems. It has housed extensive astronomical research since 1873. It is also one of the works by Samuel Hannaford included in a thematic group of his buildings.
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 80003043, listed March 3, 1980. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence medium).
Key facts
| Address | Observatory Pl., Cincinnati |
|---|---|
| County | Hamilton County |
| Listed | March 3, 1980 |
| Reference number | 80003043 |
| Resource type | Building |
| Architect / builder | Samuel Hannaford (architect); builder unknown |
| Architectural style | Greek Revival |
| Areas of significance | Architecture |
| Level of significance | National |
| National Historic Landmark | Yes, designated December 9, 1997 |
| Status (as stated in the nomination) | Condition listed as excellent inside and out; the 16-inch telescope is no longer in use because glare and pollution make observation difficult. |
| Coordinates | 39.14287, -84.42264 (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 80003043.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q3348364
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.