3520-50 MARKET ST
OFF BLD N/PKG N/COM MASON · Philadelphia · 19104
At a glance
3520-50 MARKET ST in Philadelphia, PA is listed on the Philadelphia property roll as “OFF BLD N/PKG N/COM MASON”, OPA account 883209520. The roll records 87,860 sq ft of building area, 5 floors, a 1986 build year and an assessed value of $26,560,800. It last sold for $25,500,000 in Sep 2016.
Recorded transfers — county roll + state sale file
Sale history
| Recorded | Price | Qualification | Source | Instrument |
|---|---|---|---|---|
| Sep 2016 | $25,500,000 | not rated | County roll | — |
Prices are the consideration recorded in Philadelphia's public property records. Where a qualification code exists it is the assessor's judgement of whether a transfer was arm's length; transfers without one appear unrated rather than assumed clean. Whether a building is on the market today, and at what price, is not a public record and is not shown here — asking prices, listings and lease terms live in private commercial databases.
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 | 883209520 |
| Site address | 3520-50 MARKET ST |
| Land use (DOR) | DD0 — OFF BLD N/PKG N/COM MASON |
| Building area (actual) | 87,860 sq ft |
| Floors / units / buildings | 5 / — / — |
| Lot size | — |
| Year built | 1986 |
| Zoning (primary) | — |
| Land value | — |
| Building value | — |
| Total assessed value | $26,560,800 |
Recorded owner (assessment roll)
MREF II 3550 MARKET LP
Owner mailing address: 100 FRONT ST STE 1500, CONSHOHOCKEN, PA, 19428
2 Philadelphia office properties share this owner mailing address →
Commercial property is usually held one building per entity; a shared mailbox is how the roll reveals a portfolio. It is evidence of common ownership, not proof.
Location
- Address
- 3520-50 MARKET ST
- City
- Philadelphia
- ZIP
- 19104
- Coordinates
- 39.95581, -75.19389
Within ~650 m
Nearby office buildings
- 3521-35 MARKET ST2 tenants
473,400 sq ft · 1974
- 25 N 38TH ST0 tenants
428,400 sq ft · 13 fl · 2024
- 3711L MARKET ST0 tenants
356,362 sq ft · 14 fl · 2015
- 3655-75 MARKET ST4 tenants
295,293 sq ft · 14 fl · 2018
- 3701 MARKET ST1 tenants
172,000 sq ft · 2000
- 3722-46 MARKET ST0 tenants
165,000 sq ft · 1993
How does 3520-50 MARKET ST compare with other Philadelphia office buildings?
At 87,860 sq ft, 3520-50 MARKET ST is about twice 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 $302 per square foot of building area, against $163 across all office floor area on the roll.
The last recorded sale priced it at $290 per square foot.
Does the owner of 3520-50 MARKET ST hold other Philadelphia office property?
2 Philadelphia office properties (2 parcels, 670K sq ft) are recorded to 2 owner entities sharing this parcel's tax-bill mailing address. A shared mailing address is evidence of common ownership, not proof of it.
What has happened at 3520-50 MARKET ST recently?
1 recorded transfer is on file for this parcel, the latest dated Sep 2016.
What does “OFF BLD N/PKG N/COM MASON” mean for this parcel?
The Philadelphia roll classifies OPA account 883209520 as “OFF BLD N/PKG N/COM MASON” (use code DD0). 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 3520-50 MARKET ST?
The recorded owner on the Philadelphia assessment roll (current) is MREF II 3550 MARKET LP. Owner mailing address on file: 100 FRONT ST STE 1500, CONSHOHOCKEN, PA, 19428.
What companies have offices at 3520-50 MARKET 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 3520-50 MARKET ST?
The Philadelphia roll records 87,860 sq ft of building area, 5 floors, a build year of 1986.
What is the assessed value of 3520-50 MARKET ST?
$26,560,800 on the Philadelphia roll. Assessed values are taxable-roll figures, not market prices.
When did 3520-50 MARKET ST last sell?
The last recorded transfer was in Sep 2016 for $25,500,000 ($290 per square foot).
What is the OPA account for 3520-50 MARKET ST?
OPA account 883209520, site address 3520-50 MARKET ST, Philadelphia. It is the key to look the parcel up in the Office of Property Assessment nightly roll (Philadelphia).
More around 3520-50 MARKET 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 883209520.
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, “3520-50 MARKET ST, Philadelphia, PA (OPA account 883209520)”, https://buildingcensus.com/offices/philly/office-building-ac202e0c (data as of October 10, 2026).