2026 taxable assessment $55,200 × 1.3998%. Estimate—not a bill or account balance.
OPA also publishes a 2027 assessment of $171,100; it is not the 2026 billed-year value.
House report
3945 Mount Vernon St
3 bd · 1 ba · 2 stories · 1,024 sqft · RSA5 · built 1930
Owner-occupancy signal · assessed $182K (2026) · 2027 OPA assessment $171K. On the 3900 block of Mount Vernon St.
BlockReport AI · cited public records
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Property summary
Assessment$182,2002026 OPA assessment · 2027: $171,100
Last sale—No sale value available
Est. tax bill$773/year2026 taxable assessment · full-value scenario $2,550/year · basis and term unverified
Tax delinquency$148City snapshot · Jun 2022
Permits5Every fetched City permit
Violations0 open3 historical across 1 case
“Open” reflects records available then historical records keep their source dates estimates are labeled
Question or correct this record
BlockReport can explain a discrepancy, but it cannot rewrite an official City record. Use the agency that owns the underlying fact:
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 2422145002026 OPA taxes $55,200 of $182,200 assessed. The assessment fields alone do not identify a program, approval date, expiration, or buyer eligibility.
See the assessment math →Applying the same rate to the billed-year full assessment. OPA's numeric split does not say when or whether the current treatment changes.
See the assessment math →Historical delinquency sources Record found
$148.41 was recorded for this parcel in Philadelphia's June 2022 delinquency snapshot for 2021. That amount may have been paid, reduced, or increased since; it is not a current payoff figure.
$42.29 principal$3.13 interest$3.14 penalty$99.85 other charges
The snapshot’s 2022 context used $124,000 total assessment, $55,200 taxable, and $68,800 exempt/abated. Those historical fields can differ from today’s OPA exemption status.
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 recordPermit on record
Record summaryAlterations permit recorded in 2020.
View supporting records →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
Verify the current tax bill and exemption
The 2026 taxable assessment implies about $773/yr, while applying the same rate to the full assessment would imply about $2,550/yr — $1,777/yr more. OPA's assessment split does not establish the exemption program, expiration, or buyer eligibility. Verify the basis and live bill with OPA and Revenue.
Built 1930: 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.
If you own it
Verify which assessment relief applies
OPA shows a material assessment exemption, but this record does not identify its legal basis or transfer treatment. Ask OPA for the approval history; if the current treatment ends, an eligible owner-occupant may need to apply separately for Homestead relief.
$148 in the June 2022 delinquency snapshot
The City recorded this amount in June 2022. It may since have been paid, reduced, or increased; verify the current balance directly with Philadelphia Revenue.
Construction next door (3944 Mount Vernon St, 2026)
Excavation deeper than 5 feet, or within 10 feet of an adjacent structure, legally requires the developer to survey neighboring homes first and give owners 10 days' written notice. Insist on the pre-construction survey — it is your evidence if cracks appear.
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.
Assessment and tax history
Every fetched annual City assessment for this house, compared with its block and ZIP. The figures show assessment change, the billed-year tax estimate, dated tax records, and recorded transfers. They do not estimate market appreciation or investment return.
Assessed value
$182,200
2026 billed-year assessment · 2027: $171,100 · built 1930
Price / sq ft
$167
block $167 · in line w/ block
Assessment change
+63%
+5%/yr since 2016 · 2027 -6% vs 2026
Est. tax bill / yr
$773
0.42% effective, reduced taxable assessment
Jun 2022 tax snapshot
$148
recorded then · verify current
Times sold
0
Assessment vs. the block and ZIP · every dated City record marked on the line
- OPA assessment · 2016$105K assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- OPA assessment · 2017$105K assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- OPA assessment · 2018$105K assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- OPA assessment · 2019$119K assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- OPA assessment · 2020$124K assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- OPA assessment · 2021$124K assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- OPA assessment · 2022$124K assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- OPA assessment · 2023$168K assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- OPA assessment · 2024$168K assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- OPA assessment · 2025$182K assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- OPA assessment · 2026$182K assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- OPA assessment · 2027$171K assessed valueOPA’s value on the City tax roll for that year. It is not an appraisal, listing price, sale price, or live tax balance.How Philadelphia property assessments work ↗
- Permit · 2011-09-26ZoningThis permit category usually covers the property’s allowed use, dimensions, occupancy, or site configuration. The approved scope—not the short category—defines what was authorized, and issuance alone does not prove completion.Philadelphia construction and repair permits ↗
- Permit · 2011-09-26AdditionThis permit category usually covers construction, repair, alteration, addition, or occupancy work. The approved scope—not the short category—defines what was authorized, and issuance alone does not prove completion.Philadelphia construction and repair permits ↗
- Permit · 2011-11-02ElectricalThis permit category usually covers electrical installation, alteration, replacement, or repair. The approved scope—not the short category—defines what was authorized, and issuance alone does not prove completion.Philadelphia construction and repair permits ↗
- Permit · 2017-01-25MechanicalThis permit category usually covers construction, repair, alteration, addition, or occupancy work. The approved scope—not the short category—defines what was authorized, and issuance alone does not prove completion.Philadelphia construction and repair permits ↗
- Permit · 2020-09-14AlterationsThis permit category usually covers construction, repair, alteration, addition, or occupancy work. The approved scope—not the short category—defines what was authorized, and issuance alone does not prove completion.Philadelphia construction and repair permits ↗
- L&I violation · 2007-12-03VACANT LOT STANDARDA dated L&I enforcement row. Read the cited code, required correction, status, and later inspections together; the title alone does not establish the property’s current condition.How L&I violations and orders work ↗
- L&I violation · 2007-12-03LICENSE-VAC LOTA dated L&I enforcement row. Read the cited code, required correction, status, and later inspections together; the title alone does not establish the property’s current condition.How L&I violations and orders work ↗
- L&I violation · 2007-12-03PROSEC- STD INFO (likely: Standard enforcement or prosecution notice)Legacy L&I shorthand; the case notice contains the actual required correction and deadlines.How L&I violations and orders work ↗
- Inspection · 2007-12-03BRU INSPA dated L&I visit or review. Its type describes the inspection program; the separate result and later rows show whether that visit passed, failed, or led to follow-up.What Philadelphia inspections check ↗
- Inspection · 2012-06-27BRU INSPA dated L&I visit or review. Its type describes the inspection program; the separate result and later rows show whether that visit passed, failed, or led to follow-up.What Philadelphia inspections check ↗
Property assessmentBlock median & rangeZIP 19104 medianAssessmentL&I violationPermitInspection
Scroll horizontally to move through the years. Each icon sits on its recorded date; records without a day are labeled and centered within their year. Select one to explain the filing.
Highlight
Every dated record10 events · exact dates, newest first
- PermitAlterations
- PermitMechanical
- InspectionBRU INSP
- PermitElectrical
- PermitZoning
- PermitAddition
- L&I violationVACANT LOT STANDARD
- L&I violationLICENSE-VAC LOT
- L&I violationPROSEC- STD INFO (likely: Standard enforcement or prosecution notice)
- InspectionBRU INSP
The paper trail
Permit on recordAlterations permit recorded in 2020.
- 2007 3 L&I violationsL&IInspection failedL&I visit
- 2011 ZoningPermitAdditionPermitElectricalPermit
- 2017 MechanicalPermit
- 2020 AlterationsPermit
Records behind the chart
Browse the source ledger
The chart above is the primary timeline. This drawer preserves every underlying dated row and its filed status for source-level review.
Browse 10 dated records deeds, permits, inspections, licenses, violations, certifications & appeals
- PermitAlterations
Permit PP-2020-008492 · Completed
For minor construction work at the subject property in accordance with all applicable provisions of the Philadelphia Code, all references codes and standards, and the attached EZ Standard, where included. Deviation from this standard shall result in permit revocation. A separate permit from the Philadelphia Department of Streets is required for any sidewalk and street closures. All means of pedestrian protection required at the site in accordance with the Philadelphia Building Code Chapter 33 shall be in place prior to start of work.
- PermitMechanical
Permit 754180 · COMPLETED
REPLACE A/C COIL AND CONDENSER REUSING DUCTWORK AND ELECTRICAL.
- InvestigationBRU INSP
Case 137047 · CLOSED
City marked the record closed; open the case for the closing reason.
- PermitElectrical
Permit 371920 · COMPLETED
INSTALL WIRING FOR 2-120 VOLT RECEPT SINGLE POLE SWITCH AND LIGHT FIXTURES AS PER 2008 NEC (WEST DIST)(SINGLE FAMILY DWELLING)
- PermitZoning
Permit 353201 · COMPLETED
ERECTION OF A ONE STORY REAR ADDITION AT THE 2ND FLOOR LEVEL
- PermitAddition
Permit 353204 · COMPLETED
ERECTION OF A ONE STORY REAR ADDITION AT THE 2ND FLOOR REAR 10'8"X10'
- ViolationVACANT LOT STANDARD
Case 137047 · Violation 756502 · CMPLY
- ViolationLICENSE-VAC LOT
Case 137047 · Violation 756501 · CMPLY
- ViolationPROSEC- STD INFO (likely: Standard enforcement or prosecution notice)
Case 137047 · Violation 756500 · CMPLY
Legacy L&I shorthand; the case notice contains the actual required correction and deadlines.
- InvestigationBRU INSP
Case 137047 · FAILED
The cited inspection visit was marked failed; later rows may show follow-up or resolution.
What this record suggests
The City file documents 5 permits touching electrical work, plumbing. 5 carries a completed, issued, or approved status; that documents the filing, not the present quality of the work.
Unavailable when this report assembled: certifications. Unavailable does not mean no record.
Flags: material assessment exemption — legal basis and term unverified · $148 recorded in the June 2022 delinquency snapshot — verify current balance. Informational only — not investment advice or a consumer report (FCRA).
The assessment exemption gap
OPA's 2026 taxable assessment implies about $773/year. Applying the same 1.3998% rate to the full assessed value would imply ~$2,550/year — $1,777/year more. That is a scenario, not a forecast: the assessment split alone does not identify the exemption program, approval date, expiration, transfer treatment, or live Tax Center balance.
2026: ($182,200 assessed − $126,978 exempt) × 1.3998% ≈ $773/yr
full-assessment scenario: $182,200 × 1.3998% ≈ $2,550/yr
The OPA amount does not prove a ten-year abatement or any other specific program. Obtain the approval history and verify the current Tax Center account; a buyer should not assume the seller's relief transfers or restarts.
The property, on paper
The city assessor's field record — the physical spec sheet behind the assessed number.
Bedrooms
3
Bathrooms
1
Stories
2
Interior
1,024 sqft
livable area
Lot
1,218 sqft
Basement
Full
city code D
Exterior condition
Above average
city code 3
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 3945 Mount Vernon St 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.
Mortgage
—
P&I · 30-yr fixed
All-in monthly
—
+ taxes & insurance
Estimated cash needed
—
down + 4% planning allowance
Modeled cash flow
—
rent − shown costs · /mo
Modeled cap rate
—
modeled NOI ÷ price
Modeled cash-on-cash
—
modeled year-1 return
Scenario for orientation, not advice. Assumes a 30-year fixed loan, $1,400/yr insurance, 1% of price/yr maintenance, and buyer cash equal to the down payment plus 4%. Taxes use this parcel's taxable assessment with an optional full-assessment stress test, not a live Tax Center balance. Cash flow and returns exclude vacancy, management, utilities, HOA or condo fees, leasing costs, income tax, and unplanned capital work.
Block context
3945 Mount Vernon St sits on the 3900 block of Mount Vernon St. Open the block report to compare its parcels, ownership and public-record history.
See the whole block →Next door: 3943 Mount Vernon St · 3947 Mount Vernon St
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, 2:46 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: unavailable. “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)