800-34 WALNUT ST
COM CONDO 10-14 STY MASON · Philadelphia · 19107
At a glance
800-34 WALNUT ST in Philadelphia, PA is listed on the Philadelphia property roll as “COM CONDO 10-14 STY MASON”, OPA account 883400600. The roll records 153,000 sq ft of building area, a 2013 build year and an assessed value of $21,672,400.
Public record — 0 matched business locations
Tenants & business locations
No active business locations at this address appear in the public records ingested so far. That is a statement about the records, not the building: tenants without a county business-tax receipt or a Florida registration at this address are invisible to public data.
Philadelphia assessment roll
Parcel record
| Field | Value |
|---|---|
| OPA account | 883400600 |
| Site address | 800-34 WALNUT ST |
| Land use (DOR) | 6K0 — COM CONDO 10-14 STY MASON |
| Building area (actual) | 153,000 sq ft |
| Floors / units / buildings | — / — / — |
| Lot size | — |
| Year built | 2013 |
| Zoning (primary) | — |
| Land value | — |
| Building value | — |
| Total assessed value | $21,672,400 |
Recorded owner (assessment roll)
TRUSTEES OF THE UNIV. OF PENNSYLVANIA
ON BEHALF OF UNIV. OF PENN HEALTH SYSTEM
Owner mailing address: 3400 CIVIC CENTER BLVD, PHILADELPHIA, PA, 19107
Location
- Address
- 800-34 WALNUT ST
- City
- Philadelphia
- ZIP
- 19107
- Coordinates
- 39.94787, -75.15511
Within ~650 m
Nearby office buildings
- 170 S INDEPENDENCE MALL W9 tenants
1,102,992 sq ft · 12 fl · 1911
- 508-32 WALNUT ST2 tenants
986,960 sq ft · 20 fl · 1918
- 701-39 MARKET ST6 tenants
845,230 sq ft · 5 fl · 1893
- 150 N INDEPENDENCE MALL W2 tenants
816,208 sq ft · 8 fl · 1976
- 1101-11 MARKET ST3 tenants
747,200 sq ft · 32 fl · 1984
- 1234 MARKET ST3 tenants
723,780 sq ft · 20 fl · 1973
How does 800-34 WALNUT ST compare with other Philadelphia office buildings?
At 153,000 sq ft, 800-34 WALNUT ST is about 4 times the size of the average office building on the Philadelphia roll, which comes to 36,284 sq ft across 2,470 buildings.
Its assessed value works out to $142 per square foot of building area, against $163 across all office floor area on the roll.
What does “COM CONDO 10-14 STY MASON” mean for this parcel?
The Philadelphia roll classifies OPA account 883400600 as “COM CONDO 10-14 STY MASON” (use code 6K0). BuildingCensus includes a parcel in its office census when the roll gives it an office-class use, so the label is the county's, not an inference.
Frequently asked questions
Who owns 800-34 WALNUT ST?
The recorded owner on the Philadelphia assessment roll (current) is TRUSTEES OF THE UNIV. OF PENNSYLVANIA, ON BEHALF OF UNIV. OF PENN HEALTH SYSTEM. Owner mailing address on file: 3400 CIVIC CENTER BLVD, PHILADELPHIA, PA, 19107.
What companies have offices at 800-34 WALNUT ST?
No business locations at this building appear in the public records ingested so far — no licence, tax or registry record currently lists this address; that is a gap in the record, not proof the building is empty.
How big is 800-34 WALNUT ST?
The Philadelphia roll records 153,000 sq ft of building area, a build year of 2013.
What is the assessed value of 800-34 WALNUT ST?
$21,672,400 on the Philadelphia roll. Assessed values are taxable-roll figures, not market prices.
What is the OPA account for 800-34 WALNUT ST?
OPA account 883400600, site address 800-34 WALNUT ST, Philadelphia. It is the key to look the parcel up in the Office of Property Assessment nightly roll (Philadelphia).
More around 800-34 WALNUT ST
Everything here comes from public records, and public records go stale. If you know better, say so.
Data provenance — public records only
- Philadelphia — Office of Property Assessment nightly roll (owner and mailing address on every parcel), Department of Records deed transfers with consideration and counterparties, and L&I business licences joined by OPA account. The universal Commercial Activity licence roll publishes no premises addresses, so occupancy shows regulated activities only.
Every fact on this page is drawn from the government records above — no listing sites, no scraped platforms, no third-party images. Facts from public records are uncopyrightable; each tenancy row carries its source and match confidence. Records can lag reality — a business-tax receipt or registration at an address is evidence of occupancy, not a lease confirmation.
Working with Philadelphia office parcels? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
Dataset updated . Source: Philadelphia assessment roll, OPA account 883400600.
About this data
Source: Office of Property Assessment nightly roll (Philadelphia), as published October 10, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “800-34 WALNUT ST, Philadelphia, PA (OPA account 883400600)”, https://buildingcensus.com/offices/philly/office-building-cda37193 (data as of October 10, 2026).