919-21 WALNUT ST
OFF BLD N/COM W/PKG MASON · Philadelphia · 19107
At a glance
919-21 WALNUT ST in Philadelphia, PA is listed on the Philadelphia property roll as “OFF BLD N/COM W/PKG MASON”, OPA account 771695000. The roll records 135,825 sq ft of building area, a 1910 build year and an assessed value of $21,557,800. 1 active business locations at this address appear in public records.
Public record — 1 matched business locations
Tenants & business locations
| Company | Suite / floor | Since | Source | Match |
|---|---|---|---|---|
| Thomas Jefferson University | — | Aug 2025 | Philadelphia L&I licence | folio match · high |
Philadelphia assessment roll
Parcel record
| Field | Value |
|---|---|
| OPA account | 771695000 |
| Site address | 919-21 WALNUT ST |
| Land use (DOR) | DE0 — OFF BLD N/COM W/PKG MASON |
| Building area (actual) | 135,825 sq ft |
| Floors / units / buildings | — / — / — |
| Lot size | — |
| Year built | 1910 |
| Zoning (primary) | — |
| Land value | — |
| Building value | — |
| Total assessed value | $21,557,800 |
Recorded owner (assessment roll)
No owning organisation shown. Where the county roll names a private individual, the name and mailing address are not published here.
Location
- Address
- 919-21 WALNUT ST
- City
- Philadelphia
- ZIP
- 19107
- Coordinates
- 39.94881, -75.15673
Within ~650 m
Nearby office buildings
- 170 S INDEPENDENCE MALL W9 tenants
1,102,992 sq ft · 12 fl · 1911
- 701-39 MARKET ST6 tenants
845,230 sq ft · 5 fl · 1893
- 1300 MARKET ST3 tenants
756,000 sq ft · 7 fl · 1920
- 1101-11 MARKET ST3 tenants
747,200 sq ft · 32 fl · 1984
- 1234 MARKET ST3 tenants
723,780 sq ft · 20 fl · 1973
- 819-41 CHESTNUT ST1 tenants
693,000 sq ft · 12 fl · 1926
How does 919-21 WALNUT ST compare with other Philadelphia office buildings?
At 135,825 sq ft, 919-21 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 $159 per square foot of building area, against $163 across all office floor area on the roll.
What does “OFF BLD N/COM W/PKG MASON” mean for this parcel?
The Philadelphia roll classifies OPA account 771695000 as “OFF BLD N/COM W/PKG MASON” (use code DE0). 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 919-21 WALNUT ST?
No owning organisation is shown for this parcel. Where the county roll names a private individual as owner, BuildingCensus does not publish the name or mailing address.
What companies have offices at 919-21 WALNUT ST?
1 active business locations at this building appear in Philadelphia public records, including Thomas Jefferson University. Public records under-count tenants that don't hold a local receipt or register the address.
How big is 919-21 WALNUT ST?
The Philadelphia roll records 135,825 sq ft of building area, a build year of 1910.
What is the assessed value of 919-21 WALNUT ST?
$21,557,800 on the Philadelphia roll. Assessed values are taxable-roll figures, not market prices.
What is the OPA account for 919-21 WALNUT ST?
OPA account 771695000, site address 919-21 WALNUT ST, Philadelphia. It is the key to look the parcel up in the Office of Property Assessment nightly roll (Philadelphia).
More around 919-21 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.
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Dataset updated . Source: Philadelphia assessment roll, OPA account 771695000.
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, “919-21 WALNUT ST, Philadelphia, PA (OPA account 771695000)”, https://buildingcensus.com/offices/philly/office-building-2def120a (data as of October 10, 2026).