3701 MARKET ST
OFF BLD N/PKG N/COM MASON · Philadelphia · 19104
At a glance
3701 MARKET ST in Philadelphia, PA is listed on the Philadelphia property roll as “OFF BLD N/PKG N/COM MASON”, OPA account 883073300. The roll records 172,000 sq ft of building area, a 2000 build year and an assessed value of $51,500,000. It last sold for $79,500,000 in Aug 2021. 1 active business locations at this address appear in public records.
The building's own benchmarking filing
Energy performance
From the building's own filing under its city's benchmarking ordinance. An ENERGY STAR score of 75 or above means the building outperforms three quarters of comparable buildings nationally. It is a self-reported figure, verified by the city only to the extent the ordinance requires.
Recorded transfers — county roll + state sale file
Sale history
| Recorded | Price | Qualification | Source | Instrument |
|---|---|---|---|---|
| Aug 2021 | $79,500,000 | 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 — 1 matched business locations
Tenants & business locations
| Company | Suite / floor | Since | Source | Match |
|---|---|---|---|---|
| UNIVERSITY CITY SCIENCE CENTER | — | Nov 2010 | Philadelphia L&I licence | folio match · high |
Philadelphia assessment roll
Parcel record
| Field | Value |
|---|---|
| OPA account | 883073300 |
| Site address | 3701 MARKET ST |
| Land use (DOR) | DD0 — OFF BLD N/PKG N/COM MASON |
| Building area (actual) | 172,000 sq ft |
| Floors / units / buildings | — / — / — |
| Lot size | — |
| Year built | 2000 |
| Zoning (primary) | — |
| Land value | — |
| Building value | — |
| Total assessed value | $51,500,000 |
Recorded owner (assessment roll)
GI ETS UC LLC
Owner mailing address: C/O GI PARTNERS 188 THE EMBARCADERO SUITE 700, SAN FRANCISCO, CA, 94105
Location
- Address
- 3701 MARKET ST
- City
- Philadelphia
- ZIP
- 19104
- Coordinates
- 39.95684, -75.19605
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
- 3722-46 MARKET ST0 tenants
165,000 sq ft · 1993
- 3440 MARKET ST2 tenants
130,002 sq ft · 6 fl · 1981
How does 3701 MARKET ST compare with other Philadelphia office buildings?
At 172,000 sq ft, 3701 MARKET ST is about 5 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 $299 per square foot of building area, against $163 across all office floor area on the roll.
The last recorded sale priced it at $462 per square foot.
What has happened at 3701 MARKET ST recently?
1 recorded transfer is on file for this parcel, the latest dated Aug 2021.
The building files energy-benchmarking disclosures — 1 report year are matched to this parcel.
What does “OFF BLD N/PKG N/COM MASON” mean for this parcel?
The Philadelphia roll classifies OPA account 883073300 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 3701 MARKET ST?
The recorded owner on the Philadelphia assessment roll (current) is GI ETS UC LLC. Owner mailing address on file: C/O GI PARTNERS 188 THE EMBARCADERO SUITE 700, SAN FRANCISCO, CA, 94105.
What companies have offices at 3701 MARKET ST?
1 active business locations at this building appear in Philadelphia public records, including UNIVERSITY CITY SCIENCE CENTER. Public records under-count tenants that don't hold a local receipt or register the address.
How big is 3701 MARKET ST?
The Philadelphia roll records 172,000 sq ft of building area, a build year of 2000.
What is the assessed value of 3701 MARKET ST?
$51,500,000 on the Philadelphia roll. Assessed values are taxable-roll figures, not market prices.
When did 3701 MARKET ST last sell?
The last recorded transfer was in Aug 2021 for $79,500,000 ($462 per square foot).
What is the OPA account for 3701 MARKET ST?
OPA account 883073300, site address 3701 MARKET ST, Philadelphia. It is the key to look the parcel up in the Office of Property Assessment nightly roll (Philadelphia).
More around 3701 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 883073300.
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, “3701 MARKET ST, Philadelphia, PA (OPA account 883073300)”, https://buildingcensus.com/offices/philly/office-building-bdc767a6 (data as of October 10, 2026).