Unity Temple
Also known as: Unity Church
Why it's listed
Unity Temple, at 875 Lake Street in Oak Park, Illinois, is a church designed by Frank Lloyd Wright and dated to 1906. It is one of the earliest monolithic concrete buildings ever built. The complex is effectively two buildings on one site joined by a connecting room: a concrete cube containing the temple, lit mainly by roof skylights and small leaded windows high on the walls, and a lower rectangular wing known as Unity House. Wooden forms were reused on every face, so the ornamentation is uniform throughout, and it departs from the features once associated with religious architecture. The building is considered a milestone of Wright's career, created when his creative powers were at their height, and authorities have ranked it among his four or five most important works. The same congregation has used it since it was built. At the time of listing it was structurally sound but needed restoration, especially a new roof, and a foundation grant was supporting that work.
Significance in brief: The nomination holds that Unity Temple is a major structure in the early development of modern architecture and one of the earliest monolithic concrete buildings. It marks a milestone in the career of Frank Lloyd Wright, who was at the height of his creative powers, and is cited by authorities as one of the four or five most significant buildings of his 70-year career.
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 70000240, listed April 17, 1970. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence medium).
Key facts
| Address | 875 Lake St., Oak Park |
|---|---|
| County | Cook County |
| Listed | April 17, 1970 |
| Reference number | 70000240 |
| Resource type | Building |
| Period of significance | 1906 |
| Architect / builder | Frank Lloyd Wright |
| Areas of significance | Architecture |
| Level of significance | National |
| National Historic Landmark | Yes, designated December 30, 1970 |
| Status (as stated in the nomination) | Described as structurally sound but in need of considerable restoration, chiefly a new roof. It has been occupied by the same congregation since construction and is open to the public nearly all the time. |
| Acreage | 0.5 |
| Coordinates | 41.88834, -87.79681 (NPS GIS) |
What listing means for this property
Religious properties are listed for their architectural or historical significance, not their religious use. Listing is honorary and does not restrict the congregation's use of the building. The federal rehabilitation credit is generally unavailable unless part of the building is income-producing; some state programmes and preservation grants do cover religious buildings. Federal funding or permits trigger Section 106 review.
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 70000240.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q1680814
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.