517-25 S 4TH ST
OFF BLD COM NO GAR MASON · Philadelphia · 19147
At a glance
517-25 S 4TH ST in Philadelphia, PA is listed on the Philadelphia property roll as “OFF BLD COM NO GAR MASON”, OPA account 883503100. The roll records 40,275 sq ft of building area, 5 floors, a 1900 build year and an assessed value of $5,276,000.
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 | 883503100 |
| Site address | 517-25 S 4TH ST |
| Land use (DOR) | DB0 — OFF BLD COM NO GAR MASON |
| Building area (actual) | 40,275 sq ft |
| Floors / units / buildings | 5 / — / — |
| Lot size | — |
| Year built | 1900 |
| Zoning (primary) | — |
| Land value | — |
| Building value | — |
| Total assessed value | $5,276,000 |
Recorded owner (assessment roll)
FOREMOST 525 LP
Owner mailing address: 525 S 4TH ST, PHILADELPHIA, PA, 19147
Location
- Address
- 517-25 S 4TH ST
- City
- Philadelphia
- ZIP
- 19147
- Coordinates
- 39.94194, -75.14881
Within ~650 m
Nearby office buildings
- 508-32 WALNUT ST2 tenants
986,960 sq ft · 20 fl · 1918
- 428-36 WALNUT ST0 tenants
361,485 sq ft · 9 fl · 1924
- 208-24 S 4TH ST0 tenants
33,722 sq ft · 5 fl
- 419 S 2ND ST3 tenants
33,500 sq ft · 3 fl · 1900
- 222-30 WALNUT ST0 tenants
30,501 sq ft · 3 fl · 1870
- 401 S 2ND ST1 tenants
27,584 sq ft · 5 fl
How does 517-25 S 4TH ST compare with other Philadelphia office buildings?
At 40,275 sq ft, 517-25 S 4TH ST is about 11% larger than 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 $131 per square foot of building area, against $163 across all office floor area on the roll.
What does “OFF BLD COM NO GAR MASON” mean for this parcel?
The Philadelphia roll classifies OPA account 883503100 as “OFF BLD COM NO GAR MASON” (use code DB0). 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 517-25 S 4TH ST?
The recorded owner on the Philadelphia assessment roll (current) is FOREMOST 525 LP. Owner mailing address on file: 525 S 4TH ST, PHILADELPHIA, PA, 19147.
What companies have offices at 517-25 S 4TH 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 517-25 S 4TH ST?
The Philadelphia roll records 40,275 sq ft of building area, 5 floors, a build year of 1900.
What is the assessed value of 517-25 S 4TH ST?
$5,276,000 on the Philadelphia roll. Assessed values are taxable-roll figures, not market prices.
What is the OPA account for 517-25 S 4TH ST?
OPA account 883503100, site address 517-25 S 4TH ST, Philadelphia. It is the key to look the parcel up in the Office of Property Assessment nightly roll (Philadelphia).
More around 517-25 S 4TH 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 883503100.
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, “517-25 S 4TH ST, Philadelphia, PA (OPA account 883503100)”, https://buildingcensus.com/offices/philly/office-building-ad4c7b31 (data as of October 10, 2026).