2026 taxable assessment $220,800 × 1.3998%. Estimate—not a bill or account balance.
OPA also publishes a 2027 assessment of $339,100; it is not the 2026 billed-year value.
House report
21 W Mount Airy Ave
2 bd · 1 ba · 2 stories · 1,230 sqft · RSA5 · built 1920
Owner-occupied · assessed $321K (2026) · 2027 OPA assessment $339K. On the 0 block of W Mount Airy Ave.
Property summary
Assessment$320,8002026 OPA assessment · 2027: $339,100
Last sale$63KRecorded 1992
Est. tax bill$3,091/year2026 OPA · Homestead-adjusted
Tax delinquencyNo 2022 matchNot proof account is current
Permits7Every fetched City permit
Violations0 openNo historical match in fetched records
“Open” reflects records available then historical records keep their source dates estimates are labeled
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Property tax
The estimate, live balance, and back-tax record are different.
BlockReport can calculate the annual tax from the City’s taxable assessment. Payments, credits, interest, and a current amount due live separately in Philadelphia Tax Center.
A Tax Center balance is net of bills, payments, credits, interest, and adjustments. A credit—or an amount due—is not automatically “back taxes.”
OPA 0920565002026 OPA removes $100,000 from the taxable assessment through the owner-occupant exemption.
Historical delinquency sources No current conclusion
This parcel did not match the June 2022 delinquency snapshot. That absence does not confirm the account is current today.
For a purchase, refinance, or closing, request the City’s official Property Payoff statement in Tax Center under “More options.”
What stands out
From the public recordImproved
Why it mattersOwner pulled a alterations permit in 2024.
View supporting records →City Property History
Fetched L&I and zoning records
Every row successfully fetched for this report is counted below. Dataset availability and matching can differ from the City's interactive file; use the official link for current detail.
- Recorded owner
- Carol L Weisl
- Tax mailing address
- 21 W MOUNT AIRY AVE, PHILADELPHIA PA, 19119
- L&I district
- NORTH
- Building ID (BIN)
- —
- OPA account
- 092056500
Permits7Every dated permit
Violation cases0No match
Investigations0No match
Building certifications0No match
Business licenses0No match
Appeals0No match
PermitsPermit number, issued date, work and City status7
PlumbingPermit 122391
Dec 18, 2007 COMPLETED Completed Feb 20, 2008
REMOVE AND INSTALL LAV, WATER CLOSET, BATHTUB, MOVE LAV DRAIN TO WALL
ZoningPermit 544298
Jun 26, 2014 COMPLETED Completed Jun 26, 2014
DEMOLITION REAR ONE STORY ADDITION AND CONSTRUCT A TWO STORY ADDITION IN ITS PLACE (HEIGHT NOT TO EXCEED 38'FT) AS PART OF AN EXISTING ATTACHED SINGLE FAMILY DWELLING
ZoningPermit 596587
Apr 10, 2015 COMPLETED Completed Apr 10, 2015
PARTIAL DEMO (MUD ROOM TO BE REMOVED), ADDITION TO REAR OF HOUSE (2 STORY), SINGLE-FAMILY DWELLING
AdditionPermit 596589
Apr 10, 2015 COMPLETED Completed Feb 3, 2016
PARTIAL DEMOLITION OF STRUCTURE AT REAR, CONSTRUCTION OF NEW TWO (2) STORY WOOD FRAME ADDITION WITH NEW STEEL HEADERS AT MASONRY OPENINGS, LVL LEDGER, ONE (1) HOUR RATED WALL AT NORTHEASTERLY PROPERTY LINE (NO OPENINGS PERMITTED AT THIS WALL) AND EXTERIOR STAIR. INTERIOR ALTERATIONS AT KITCHEN/BEDROOM/BATHROOM PORTIONS OF FIRST AND SECOND FLOORS. SEPARATE PERMITS REQUIRED FOR ALL MECHANICAL, ELECTRICAL AND PLUMBING WORK.
ElectricalPermit 605306
Apr 24, 2015 COMPLETED Completed Nov 16, 2015
RE-WIRE BATHROOM, BEDROOMS, LAUNDRY ROOM, KITCHEN, WITH SWITCHES, LIGHTS, RECEPTS, SMOKE DETECTORS & ADD RECESSED LIGHTING IN DINING ROOM AND LIVING ROOM, WIRE NEW ADDITION AT BACK OF THE HOUSE AS PER 2008 NEC (NORTH DISTRICT)
PlumbingPermit 610240
May 14, 2015 COMPLETED Completed Dec 28, 2015
RUN DRAIN AND WATER LINES TO NEW KITCHEN SINK FIRST FLOOR POWER ROOM AND LAUNDRY AND BATHROOM ON SECOND FLOOR (NORTH DISTRICT)
AlterationsPermit PP-2024-016709
Dec 10, 2024 Completed Completed Dec 19, 2024
Replace curb trap, fresh air inlet and main drain
Violation cases0 individual violation records; resolved history remains visible0
No violation cases matched this parcel in the fetched City dataset.
InvestigationsEvery inspector visit, including CLOSED outcomes0
No investigations matched this parcel in the fetched City dataset.
Building certificationsInspection result and filed expiration date by L&I building ID0
No building certifications matched this parcel in the fetched City dataset.
Business licensesHistorical and active licenses are both retained0
No business licenses matched this parcel in the fetched City dataset.
AppealsApplication status and decision are separate City fields0
No appeals matched this parcel in the fetched City dataset.
City of Philadelphia OPA, L&I and Zoning Board records, shown as filed. A CLOSED investigation is an outcome label, not a missing visit; an appeal's application status and decision may differ.
Legal due diligence
What this record proves—and what it does not.
These checks are triggered by this property’s actual City rows. They identify the controlling document to verify; they do not declare a use legal, a building safe, or title clear.
1 verify
VerifyHomestead is tied to owner occupancy and the deedOPA shows the Homestead Exemption.
Why it mattersPhiladelphia limits Homestead to an owner’s primary residence. The City says a deed change can require a new application or update.
Verify nextA buyer should apply in their own name and not assume the seller’s benefit continues.
Open the controlling City guidance ↗Closing file: checks no public-record summary can replace5 documents/searches to assign before settlement
Property Sales Certification
The seller must obtain Philadelphia’s certificate showing the base zoning, last use in the zoning record, and open violations. The City warns that it does not prove Building Code occupancy or show zoning overlays.
Next: Obtain the fresh certificate and compare it with the CO, permits, and Atlas overlays.
Official guidance ↗Date-effective City Property Payoff
The Tax Center Property Payoff covers Real Estate Tax, Commercial Trash, and L&I abatement-work invoices. Philadelphia says it does not include business-tax debts or liens, water and sewer charges, or fines for code violations.
Next: Request the City statement effective through settlement; read every period and invoice.
Official guidance ↗Professional title and water-lien searches
OPA ownership, deed summaries, and a zero tax balance are not clear title. Mortgages, judgments, municipal claims, water liens, easements, heirs, and other encumbrances require separate searches.
Next: Use a Pennsylvania lawyer/title company and obtain owner’s title insurance; order the separate water search/payoff.
Official guidance ↗Separate water-lien guidance ↗Seller-specific tax relief is not the buyer’s bill
LOOP and low-income or senior Real Estate Tax freezes depend on the qualifying owner and continued program eligibility; a buyer cannot assume the seller’s capped or frozen bill continues. A separately verified property abatement often remains with the property for its remaining term, but program-specific new-owner filing, use, and tax-compliance conditions still must be confirmed—not inferred from the reduced assessment alone.
Next: Have Revenue or OPA identify every current benefit, model the buyer’s bill without seller-specific relief, and confirm any verified abatement in writing.
Official guidance ↗Separate water-lien guidance ↗Seller disclosure and independent inspections
For a covered Pennsylvania residential transfer, obtain the statutory seller disclosure. It reports the seller’s knowledge; it is not a warranty, title search, code review, or substitute for inspections. Because OPA dates this building before 1978, separately obtain the required federal/City lead disclosures and any test results.
Next: Have the agreement and disclosure reviewed for this transaction’s coverage and exceptions.
Official guidance ↗Informational only—not a legal opinion, title report, code inspection, tax payoff, or substitute for a Pennsylvania lawyer, title company, inspector, or tax professional.
What to do with this
The record, translated into moves — what a buyer, the owner, and a landlord would each want to check next under Philadelphia's actual rules.
If you’re buying
Built 1920: lead rules apply
Federal law requires a lead-paint disclosure at sale for any pre-1978 home. If it will be rented, Philadelphia also requires a lead-safe or lead-free certificate before a rental license can issue.
Zoned RSA5: one household by right
Single-family rowhouse (the classic Philly row). Converting to a duplex or apartments needs a use variance the zoning board rarely grants — Pennsylvania courts require a physical hardship of the lot itself, and economics alone do not qualify.
Derived from the fetched property records and linked City guidance as of 2026. Assessment treatment is not a substitute for an exemption approval, live balance, title report, license, occupancy certificate, or inspection. Informational only — not legal, tax, or investment advice.
The investment read
How this house has moved and where it's pointed: the city's assessed value (not a listing price) over 12 years, charted against its block; appreciation is that history's pace, and the 5-year figure simply extends it. Yield estimates rent-vs-price from area rents. Ask the record to dig into any number.
Assessed value
$320,800
2026 billed-year assessment · 2027: $339,100 · built 1920
Price / sq ft
$276
block $273 · in line w/ block
Appreciation
+97%
+7%/yr, city 6.5%
In 5 years (~2031)
~$340K
+7%/yr own pace held 5 yrs — extrapolation, not a forecast
Est. tax bill / yr
$3,091
0.91% effective
Jun 2022 tax snapshot
No match
not proof the account is current
Gross yield
5%
≈$1K/mo rent
Times sold
0
Value vs. the block, over time — sales, permits & L&I events marked on the line
This houseBlock median & rangePermit
The paper trail
ImprovedOwner pulled a alterations permit in 2024.
- 2007 PlumbingPermit
- 2014 ZoningPermit
- 2015 ZoningPermitAdditionPermitElectricalPermitPlumbingPermit
- 2024 AlterationsPermit
Informational only — not investment advice or a consumer report (FCRA).
The property, on paper
The city assessor's field record — the physical spec sheet behind the assessed number.
Bedrooms
2
Bathrooms
1
Stories
2
Interior
1,230 sqft
livable area
Lot
1,597 sqft
Basement
Full
city code D
Heat
Hot water / radiators
city code B
Central air
No
Exterior condition
Average
city code 4
Above averageBelow average
Interior condition
Average
city code 4
Above averageBelow average
Quality grade
C
assessor's grade
ABCDE
Zoning
RSA5
city zoning code
OPA field-assessment attributes. Condition and grade are the assessor's codes, not an inspection.
Run the numbers
What owning 21 W Mount Airy Ave takes, at your price and your rate. Taxes start with an annual estimate from the City’s taxable assessment, not a current bill or balance; rent starts at the area median. Assessed value is not an asking price — set the price slider to the real one.
When this house last sold (1992) a 30-year mortgage ran about 8.39% — Freddie Mac's average that year.
Mortgage
—
P&I · 30-yr fixed
All-in monthly
—
+ taxes & insurance
Cash to close
—
down + ~4% costs
Cash flow
—
rent − all costs · /mo
Cap rate
—
NOI ÷ price
Cash-on-cash
—
year-1 return on cash in
Estimates for orientation, not advice. Assumes a 30-year fixed loan, $1,400/yr insurance, 1% of price/yr maintenance; taxes use this parcel's taxable assessment, not a live Tax Center balance.
Block context
21 W Mount Airy Ave sits on the 0 block of W Mount Airy Ave. Open the block report to compare its parcels, ownership and public-record history.
See the whole block →Next door: 19 W Mount Airy Ave · 23 W Mount Airy Ave
Where this comes from
- Assessment, spec sheet & owner — OPA Property Assessments, Office of Property Assessment
- Sales & deed history — Realty Transfer Tax records, Recorder of Deeds
- Permits, violations & inspections — L&I Property History · Atlas
- Tax delinquency snapshot · June 2022 — Real Estate Tax Delinquencies, Dept. of Revenue
- Historical tax ledger & liens · through 2016 — Real Estate Tax Balances, Dept. of Revenue
- Current property-tax balance — Verify with Philadelphia Revenue
- Zoning appeals — L&I & Zoning Board appeals
- Neighborhood income & rents — US Census ACS 5-year estimates
- Historical mortgage rates — Freddie Mac Primary Mortgage Market Survey, annual averages
- Imagery — Street photo © Google · Aerial © Esri, Maxar
Methodology & freshness
This report was assembled Jul 10, 2026, 1:24 AM ET. Available City datasets are queried from OpenDataPhilly (phl.carto.com) and the cited City ArcGIS feeds; record queries paginate rather than silently taking a first page. For this property: Permits: queried · Violations: queried · Investigations: queried · Appeals: queried · Licenses: queried · Building certifications: queried. “Unavailable” means the source query failed or was not supplied, not “no record.” Reports re-pull on view after seven days and on an overnight rolling schedule; citywide benchmarks recompute weekly. Source dates still govern: the parcel-level tax-delinquency snapshot is June 2022 and the separate detailed tax ledger ends in 2016, so neither establishes today’s balance. The live balance and date-effective payoff must be verified in Tax Center. AI-written passages are grounded in the assembled record and rejected if they state a number the record does not hold.
Official city record ↗ · L&I history ↗ · See the whole block · Download this record (JSON)