6401-07 CASTOR AVE
STR/OFF 2 STY MASONRY · Philadelphia · 19149
At a glance
6401-07 CASTOR AVE in Philadelphia, PA is listed on the Philadelphia property roll as “STR/OFF 2 STY MASONRY”, OPA account 882832900. The roll records 12,040 sq ft of building area, 2 floors, a 1940 build year and an assessed value of $817,900. 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 |
|---|---|---|---|---|
| GP SENIOR CENTER LLC | — | Jun 2023 | Philadelphia L&I licence | folio match · high |
Philadelphia assessment roll
Parcel record
| Field | Value |
|---|---|
| OPA account | 882832900 |
| Site address | 6401-07 CASTOR AVE |
| Land use (DOR) | BB0 — STR/OFF 2 STY MASONRY |
| Building area (actual) | 12,040 sq ft |
| Floors / units / buildings | 2 / — / — |
| Lot size | — |
| Year built | 1940 |
| Zoning (primary) | — |
| Land value | — |
| Building value | — |
| Total assessed value | $817,900 |
Recorded owner (assessment roll)
ON LEUNG CHINESE MERCHANT ASSOCIATION
Owner mailing address: 3233 FANSHAWE ST, PHILADELPHIA, PA, 19149
Location
- Address
- 6401-07 CASTOR AVE
- City
- Philadelphia
- ZIP
- 19149
- Coordinates
- 40.03943, -75.07697
Within ~650 m
Nearby office buildings
- 6044-52 CASTOR AVE0 tenants
20,100 sq ft · 2 fl · 1925
- 6601-19 CASTOR AVE3 tenants
9,702 sq ft · 1 fl · 1946
- 6816 CASTOR AVE0 tenants
7,500 sq ft · 1 fl · 1955
- 6434 CASTOR AVE1 tenants
5,959 sq ft · 1 fl · 1954
- 6426 CASTOR AVE1 tenants
3,237 sq ft · 1 fl · 1954
- 6421-23 CASTOR AVE1 tenants
3,204 sq ft · 1 fl · 1954
How does 6401-07 CASTOR AVE compare with other Philadelphia office buildings?
At 12,040 sq ft, 6401-07 CASTOR AVE is about 67% smaller 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 $68 per square foot of building area, against $163 across all office floor area on the roll.
What does “STR/OFF 2 STY MASONRY” mean for this parcel?
The Philadelphia roll classifies OPA account 882832900 as “STR/OFF 2 STY MASONRY” (use code BB0). 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 6401-07 CASTOR AVE?
The recorded owner on the Philadelphia assessment roll (current) is ON LEUNG CHINESE MERCHANT ASSOCIATION. Owner mailing address on file: 3233 FANSHAWE ST, PHILADELPHIA, PA, 19149.
What companies have offices at 6401-07 CASTOR AVE?
1 active business locations at this building appear in Philadelphia public records, including GP SENIOR CENTER LLC. Public records under-count tenants that don't hold a local receipt or register the address.
How big is 6401-07 CASTOR AVE?
The Philadelphia roll records 12,040 sq ft of building area, 2 floors, a build year of 1940.
What is the assessed value of 6401-07 CASTOR AVE?
$817,900 on the Philadelphia roll. Assessed values are taxable-roll figures, not market prices.
What is the OPA account for 6401-07 CASTOR AVE?
OPA account 882832900, site address 6401-07 CASTOR AVE, Philadelphia. It is the key to look the parcel up in the Office of Property Assessment nightly roll (Philadelphia).
More around 6401-07 CASTOR AVE
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 882832900.
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, “6401-07 CASTOR AVE, Philadelphia, PA (OPA account 882832900)”, https://buildingcensus.com/offices/philly/office-building-334530d0 (data as of October 10, 2026).