1835 Market Street
high-rise building located in the Market West region of Philadelphia
1835 Market Street, formerly known as Eleven Penn Center (or 11 Penn Center), is a high-rise building located in the Market West region of Philadelphia. The building stands at 425 feet (130 meters) with 29 floors. Radnor Corp. the real estate arm of Sun Co. began development of the property in 1984. It opened in 1986 and Colonial Penn was one of the anchor tenants. The architectural firm who designed the building was the Kling Lindquist Partnership. 1835 Market Street is a part of Penn Center complex, which includes several notable skyscrapers such as the Mellon Bank Center and Five Penn Center.
It is currently the 24th-tallest building in Philadelphia.
Ownership
In 2002, a joint venture including the California State Teachers' Retirement System (CalSTRS) purchased the tower for US$80,000,000.
This brief starts where responsible research should: with the source description of “1835 Market Street” as high-rise building located in the Market West region of Philadelphia. Everything that follows is an evidence route, not borrowed authority.
Why this record matters
The subject matters to the places & architecture register because the source frames it as high-rise building located in the Market West region of Philadelphia. Its deeper value depends on whether names, dates, institutions and citations support that framing.
Maps, plans, fabric surveys and administrative records can establish how the site’s name, extent and function changed over time. The source revision retrieved here is dated Feb 28, 2026. The linked authority identifier is Q4554425. Authority coordinates are 39.954, -75.171. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1835, 1984, 1986 and 2002.
Modern boundaries and familiar names can conceal earlier jurisdictions or structures that do not align with the present site. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
- Historic place names
- Jurisdictional context
- Routes into maps and plans
Contemporary maps, plans, listed-building records, estate papers and the responsible local or national archive.
Three-step research path
- Establish the record: confirm the title “1835 Market Street”, its source revision and the description used here.
- Expand the search: follow 1835 Market Street primary sources, 1835 Market Street archive and Market research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “1835 Market Street”?
- Which authority defined the place, boundary or structure at the relevant date?
- What physical evidence or contemporary plan supports the description?
Search terms from this dossier
This entry incorporates text from “1835 Market Street” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.