4601 MARKET ST
OFF BLD N/COM W/PKG MASON · Philadelphia · 19139
At a glance
4601 MARKET ST in Philadelphia, PA is listed on the Philadelphia property roll as “OFF BLD N/COM W/PKG MASON”, OPA account 883080802. The roll records 245,204 sq ft of building area, a 1975 build year and an assessed value of $51,971,700. 2 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.
Public record — 2 matched business locations
Tenants & business locations
| Company | Suite / floor | Since | Source | Match |
|---|---|---|---|---|
| KIPP Philadelphia Octavius Catto Charter School | — | Dec 2024 | Philadelphia L&I licence | folio match · high |
| Ambassador Academy Robots & Mentors | — | Jul 2023 | Philadelphia L&I licence | folio match · high |
Philadelphia assessment roll
Parcel record
| Field | Value |
|---|---|
| OPA account | 883080802 |
| Site address | 4601 MARKET ST |
| Land use (DOR) | DE0 — OFF BLD N/COM W/PKG MASON |
| Building area (actual) | 245,204 sq ft |
| Floors / units / buildings | — / — / — |
| Lot size | — |
| Year built | 1975 |
| Zoning (primary) | — |
| Land value | — |
| Building value | — |
| Total assessed value | $51,971,700 |
Recorded owner (assessment roll)
IS3 TEAM LLC
Owner mailing address: 2929 WALNUT ST STE 1540, PHILADELPHIA, PA, 19104
4 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
- 4601 MARKET ST
- City
- Philadelphia
- ZIP
- 19139
- Coordinates
- 39.96026, -75.21498
Within ~650 m
Nearby office buildings
- 111 N 49TH ST3 tenants
390,000 sq ft · 3 fl · 2010
- 4701 MARKET ST0 tenants
171,416 sq ft
- 4610 HAVERFORD AVE0 tenants
162,486 sq ft
- 4415 CHESTNUT ST2 tenants
57,300 sq ft · 5 fl · 2022
- 4917 ASPEN ST0 tenants
55,144 sq ft · 1925
- 4865 MARKET ST3 tenants
52,000 sq ft · 2 fl · 2012
How does 4601 MARKET ST compare with other Philadelphia office buildings?
At 245,204 sq ft, 4601 MARKET ST is about 7 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 $212 per square foot of building area, against $163 across all office floor area on the roll.
Does the owner of 4601 MARKET ST hold other Philadelphia office property?
4 Philadelphia office properties (4 parcels, 624.1K sq ft) are recorded to 4 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 4601 MARKET ST recently?
The building files energy-benchmarking disclosures — 1 report year are matched to this parcel.
What does “OFF BLD N/COM W/PKG MASON” mean for this parcel?
The Philadelphia roll classifies OPA account 883080802 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 4601 MARKET ST?
The recorded owner on the Philadelphia assessment roll (current) is IS3 TEAM LLC. Owner mailing address on file: 2929 WALNUT ST STE 1540, PHILADELPHIA, PA, 19104.
What companies have offices at 4601 MARKET ST?
2 active business locations at this building appear in Philadelphia public records, including KIPP Philadelphia Octavius Catto Charter School, Ambassador Academy Robots & Mentors. Public records under-count tenants that don't hold a local receipt or register the address.
How big is 4601 MARKET ST?
The Philadelphia roll records 245,204 sq ft of building area, a build year of 1975.
What is the assessed value of 4601 MARKET ST?
$51,971,700 on the Philadelphia roll. Assessed values are taxable-roll figures, not market prices.
What is the OPA account for 4601 MARKET ST?
OPA account 883080802, site address 4601 MARKET ST, Philadelphia. It is the key to look the parcel up in the Office of Property Assessment nightly roll (Philadelphia).
More around 4601 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 883080802.
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, “4601 MARKET ST, Philadelphia, PA (OPA account 883080802)”, https://buildingcensus.com/offices/philly/office-building-1fa90999 (data as of October 10, 2026).