United States Post Office-Main Branch
Why it's listed
Occupying an entire city block at the southeast corner of Market and 30th Streets in Philadelphia, this six-story steel-frame post office was designed in 1931 and completed in 1935 in the Art Deco style. Its limestone walls rest on a granite base and are organized into fluted piers, bronze-framed windows and stepped upper setbacks, with carved limestone panels on the north tower. The building was planned as part of the Philadelphia Improvements program, a transportation project linking the Pennsylvania Railroad with the city, and was intended to connect rail service with mail handling below ground. Rankin & Kellogg and Tilden, Register & Pepper were chosen as architects, and construction took four years amid labor disputes and strikes. Within its first year it handled about 1.25 million pieces of mail daily. It is regarded as an important center for mail and package distribution in Philadelphia and a prominent example of federal architecture from the 1930s.
Significance in brief: The nomination argues the building is significant under Criterion A for its role in Philadelphia's postal history and mail distribution, and under Criterion C as a prominent work of the architecture firms Rankin & Kellogg and Tilden, Register & Pepper. It describes the building as an outstanding example of the Art Deco style, with the Main Branch's period of significance covering its full construction and early use.
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 06000782, listed September 5, 2006. Summary generated October 2026 (model claude-haiku-5-5, prompt v1.1-2026-10-29, confidence high).
Key facts
| Address | 2970 Market St., Philadelphia |
|---|---|
| County | Philadelphia |
| Listed | September 5, 2006 |
| Reference number | 06000782 |
| Resource type | Building |
| Period of significance | 1931-1955 |
| Architect / builder | Rankin & Kellogg; Tilden, Register & Pepper; James A. Wetmore (supervising architect); Starrett Brothers & Eken (contractor) |
| Architectural style | Art Deco |
| Criteria |
|
| Areas of significance | Architecture, Politics/Government |
| Level of significance | Local |
| Status (as stated in the nomination) | Owned by the University of Pennsylvania after a 2004 sale and planned for rehabilitation as offices; the USPS continues to lease part of the building for administrative offices. |
| Acreage | 5 |
| Coordinates | 39.95592, -75.18251 (NPS GIS) |
What listing means for this property
For a publicly owned building or structure, listing mainly matters when federal funds, permits or licences are involved: projects then go through Section 106 review so effects on the property are considered. Listing also strengthens applications for preservation grants and, for leased income-producing uses, can enable the federal rehabilitation tax credit.
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 06000782.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q7890899
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.