A condo is one of the hardest property types for a citywide model to value fairly. Two units in the same Center City high-rise — a converted loft, a new-build tower — can share an address and a footprint yet be worth very different amounts, because floor, view, line, and finish level move the price far more than square footage alone. When the model flattens those differences, an owner ends up over-assessed. The good news: condos also offer the cleanest evidence of all — sales inside your own building.
The Office of Property Assessment (OPA) values hundreds of thousands of parcels at once with mass appraisal — a model that groups similar properties and leans on recent sales. That approach struggles with condos because the things that drive a unit's value are precisely the things a per-square-foot model tends to smooth over. Within a single building, the same floor plan can be worth tens of thousands more on a high floor with a river view than on a low floor facing an air shaft.
Three patterns drive the misses:
The best comparables for a condo are sales within the same building or association — same land, same amenities, same association — adjusted for floor and square footage.
The question is the same as for a house: does your assessed (market) value line up with what genuinely comparable units have actually sold for? For a condo, "comparable" has a sharper meaning — the strongest evidence is recent sales of other units in your own building or condo association, then adjusted for floor and square footage. Same-building sales hold the land, amenities, and association constant, so they isolate exactly the differences that matter. Our comparable-sales guide explains how to make those adjustments defensibly, and the self-check walkthrough shows the underlying math.
When in-building sales are thin — common in a small association or a brand-new building — sales in genuinely similar nearby buildings can fill the gap, but same-building comps always come first. Your job is to show the model over-valued your specific unit, and nothing does that as cleanly as the unit two floors down that sold last spring.
Condo records carry factual errors just like houses do — an overstated square footage, a wrong bedroom count or unit mix, a misfiled floor or a parking flag that doesn't match the deed. A factual error in the OPA record is one of the cleanest grounds for a reduction, and it costs nothing to verify. Start by reading your assessment notice against what's actually in your unit.
Condo owners use the identical process as every other Philadelphia owner. You can start with a First Level Review, an informal request that OPA reconsider, using the form and deadline printed on your annual notice. Or you can file a formal appeal to the Board of Revision of Taxes, whose deadline is generally the first Monday in October of the year before the tax year — always confirm the current-year date at phila.gov before you file. No lawyer is required for either path; the filing right is the owner's, and the real work is the evidence.
If your condo is your primary residence, make sure you've claimed the Homestead Exemption. It applies to an owner-occupied condo exactly as it does to a house, reduces the taxable portion of your assessed value, and stacks on top of any appeal. At roughly 1.4% of assessed value (1.3998%), even a modest correction is a meaningful annual saving that recurs until the next reassessment.
The hard part of a condo appeal is precisely the part a model gets wrong: finding the right same-building sales and adjusting them for floor, size, and finish. TaxAssessmentIQ pulls your live OPA record, surfaces the real comparable sales in and around your building, tells you whether the gap is worth appealing, and generates a BRT-ready packet — so all that's left is to sign and send.
The strongest comparables are recent sales of other units in the same building or condo association, adjusted for floor, square footage, and view. Units in the same building share the same land, amenities, and association, so they isolate the differences that actually matter. When in-building sales are thin, sales in genuinely similar nearby buildings can help, but same-building comps come first.
Mass appraisal groups similar properties, but units in one high-rise can differ sharply by floor, line, view, and finish level while a model may treat them alike. A high floor with a river view and a renovated kitchen is not the same product as a low floor facing an air shaft, yet a per-square-foot model can value them close together. That gap is exactly what a same-building comparable analysis exposes.
Yes. A factual error in the OPA record — an overstated square footage, a wrong unit mix or bedroom count, a misfiled floor or parking flag — is one of the cleanest grounds for a reduction, and it costs nothing to verify. Read your assessment notice against the actual unit and flag anything that does not match.
Yes. The Homestead Exemption is for an owner-occupied primary residence, and an owner-occupied condo unit qualifies just as a house does. It reduces the taxable portion of your assessed value and stacks on top of any appeal, so it is worth confirming you have it filed. Confirm current-year details at phila.gov.
Condo owners use the same two tracks as everyone else. The First Level Review deadline is printed on your annual assessment notice, and the formal Board of Revision of Taxes appeal deadline is generally the first Monday in October of the year before the tax year. Always confirm the current-year date at phila.gov before you file.
TaxAssessmentIQ gives you a free, honest verdict from the City's own recorded sales — just enter your address, no sign-up and no account. If your unit looks over-assessed, you can get a ready-to-file appeal packet for a flat, one-time price, backed by a money-back guarantee. If it isn't worth filing, we tell you that too — for free, before you pay anything.