2026 assessment
$479K
OPA value, not a listing price
House report
1817 Mountain St
4 bd3 ba1,616 sqftRSA5built 1925
Property at a glanceHouse
Owner-occupancy signal
ZIP 19145 area
Girard Estate · South Philadelphia
1800 block of Mountain St
Assessment and City record timeline
Published City assessments for this house against its block and ZIP. Dated City filings are marked on the same line. Select one to read it. Assessments are tax-roll values, not sale prices or appraisals.
- OPA assessment · 2016$57K 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$57K 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$330K 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$293K 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$315K 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$315K 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$315K 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$272K 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$272K 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$479K 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$479K 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$400K 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 ↗
- Deed / sale · 2018Deed / sale $340KA recorded real-estate document or transfer event. The amount and date can be useful history, but the underlying deed and transfer-tax filing control the parties, consideration, and legal effect.How to read the recorded document ↗
- Deed / sale · 2020Deed / sale $253KA recorded real-estate document or transfer event. The amount and date can be useful history, but the underlying deed and transfer-tax filing control the parties, consideration, and legal effect.How to read the recorded document ↗
- Deed / sale · 2022Deed / sale $460KA recorded real-estate document or transfer event. The amount and date can be useful history, but the underlying deed and transfer-tax filing control the parties, consideration, and legal effect.How to read the recorded document ↗
- Permit · 2014-11-25Major alterationA broad legacy permit work category for a substantial building alteration. It can include changed layouts, partitions, fixtures, finishes, structural work, or occupancy-related work, but only the approved scope and plans say what this permit actually authorized; separate trade permits may be required.What Philadelphia building permits can cover ↗
- Permit · 2015-07-22ZoningThis 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 · 2016-01-11AdditionThis 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 · 2016-03-08PlumbingThis permit category usually covers water, drainage, fixtures, or other plumbing 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 · 2016-03-08ElectricalThis 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 · 2016-09-12Major alterationA broad legacy permit work category for a substantial building alteration. It can include changed layouts, partitions, fixtures, finishes, structural work, or occupancy-related work, but only the approved scope and plans say what this permit actually authorized; separate trade permits may be required.What Philadelphia building permits can cover ↗
- Permit · 2016-10-13PlumbingThis permit category usually covers water, drainage, fixtures, or other plumbing 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 · 2017-05-26AdministrativeThis 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 · 2017-06-06MechanicalThis 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 · 2014-11-01ROOF PARTIALLY COLLAPSEDA 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 ↗
- Inspection · 2014-11-01CSUINITIALA 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 ↗
- L&I violation · 2015-04-08VAC PROP REPLAC WIN/DRS 80%A 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 · 2015-04-08LICENSE-VAC RES BLDG (vacant residential building license required)This usually records a requirement to obtain a Vacant Structure License for an unoccupied residential building. Check later license and compliance rows because it does not establish present vacancy or an unresolved violation.How the City licenses vacant residential property ↗
- Inspection · 2015-04-08HCEU INSP (Housing Code Enforcement Unit inspection)A legacy L&I inspection label. The unit inspected housing for property-maintenance, fire-prevention, and related code compliance; the separate status says how that visit ended.What Philadelphia inspections check ↗
- Inspection · 2015-02-12CSUINITIALA 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 · 2015-11-30HCEU INSP (Housing Code Enforcement Unit inspection)A legacy L&I inspection label. The unit inspected housing for property-maintenance, fire-prevention, and related code compliance; the separate status says how that visit ended.What Philadelphia inspections check ↗
- Inspection · 2016-04-06HCEU INSP (Housing Code Enforcement Unit inspection)A legacy L&I inspection label. The unit inspected housing for property-maintenance, fire-prevention, and related code compliance; the separate status says how that visit ended.What Philadelphia inspections check ↗
Property assessmentBlock median & rangeZIP 19145 (Girard Estate · South Philadelphia) medianAssessmentDeed / saleL&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 record20 events · exact dates, newest first
- Deed / saleDeed / sale $460K
- Deed / saleDeed / sale $253K
- Deed / saleDeed / sale $340K
- PermitMechanical
- PermitAdministrative
- PermitPlumbing
- PermitMajor alteration
- InspectionHCEU INSP (Housing Code Enforcement Unit inspection)
- PermitPlumbing
- PermitElectrical
- PermitAddition
- InspectionHCEU INSP (Housing Code Enforcement Unit inspection)
- PermitZoning
- L&I violationVAC PROP REPLAC WIN/DRS 80%
- L&I violationLICENSE-VAC RES BLDG (vacant residential building license required)
- InspectionHCEU INSP (Housing Code Enforcement Unit inspection)
- InspectionCSUINITIAL
- PermitMajor alteration
- L&I violationROOF PARTIALLY COLLAPSED
- InspectionCSUINITIAL
Flags: material assessment exemption; legal basis and term unverified. Informational only. Not investment advice or a consumer report (FCRA).
Verify the public record
Property tax
$1,557/year estimated property tax
2026 taxable assessment $111,198 × 1.3998%. This is an estimate, not a bill or account balance. The City maintains payments, credits, interest, and the current amount due.
OPA has published a 2027 assessment of $400,200. It is not the 2026 billed-year value.
Payments, credits, interest, and the current amount due are maintained by the City.
OPA 3630952002026 OPA taxes $111,198 of $479,300 assessed. The assessment fields alone do not identify a program, approval date, expiration, or buyer eligibility.
See the assessment math →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.”
The assessment exemption gap
OPA's 2026 roll shows a partial assessment exemption. The annual difference is measurable; the reason for it and what happens after a sale are not established here.
$111,198 taxable basis
Difference to verify+$5,152/year
$479,300 scenario basis
The assessment roll does not identify
- Legal basis or program
- Approval or expiration date
- Treatment after a sale
- Current Tax Center balance
Show the assessment math
2026: ($479,300 assessed − $368,102 exempt) × 1.3998% ≈ $1,557/year
Full-assessment scenario: $479,300 × 1.3998% ≈ $6,709/year
Do not treat the full-assessment scenario as inevitable or assume the current relief transfers. Obtain the approval history and verify the live Tax Center account before relying on either number.
The property, on paper
OPA physical field record.
Bedrooms
4
Bathrooms
3
Interior
1,616 sqft
livable area
Lot
665 sqft
Basement
Full, finished
city code A
Heat
Forced hot air
city code A
Central air
Yes
Exterior condition
Above average
city code 3
Above averageBelow average
Interior condition
Above average
city code 3
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.
Block context
1800 block of Mountain St. Compare parcels, ownership, and public-record history.
See the whole block →Next door: 1815 Mountain St · 1819 Mountain St
L&I license dates · data through Jul 25, 2026
Business licenses at this address Latest pull
What L&I has registered at this OPA parcel, newest initial license date first.
No L&I business license is on record at this address in data through Jul 25, 2026.
A license is an L&I registration, not proof that a business is open, operating today, or located at this storefront. Dates are license dates. Events are deduped by parcel, business identity, and license type, so a renewal is not shown as another opening. Other permit and filing types remain in the full source ledger.
Open every source row 20 dated rows
- Recorded transfer$460K transfer
2022
- Recorded transfer$253K transfer
2020
- Recorded transfer$340K transfer
2018
- PermitMechanical
Permit 789589 · COMPLETED
EZ PERMIT DUCTWORK & WARM-AIR APPLIANCES- FOR THE INSTALLATION OF NEW DUCTWORK, REGISTERS/GRILLES/DIFFUSERS, AND WARM-AIR APPLIANCES AS PER ATTACHED STANDARD. DEVIATIONS FROM THIS STANDARD WILL RESULT IN PERMIT REVOCATION AND REQUIRE SUBMISSION OF CONSTRUCTION PLANS.
- PermitAdministrative
Permit 718030 · COMPLETED
AMENDING PERMIT #654408 SUBMITTING NEW DRAWINGS PER ATTACHED DRAWINGS CHANGE IN SIZE OF STUDS PER PLANS.
- PermitPlumbing
Permit 729111 · COMPLETED
1" WATER SERVICE, 5" LATERAL, CURB TRAP AND FAI-PA1#20162801240-"SELF-CERTIFICATION'S ARE NO LONGER PERMITTED" - "ALL EXCAVATIONS AND PLUMBING TRENCHES IN EXCESS OF 5 FEET IN DEPTH MUST HAVE APPROVED SHORING IN PLACE AT THE TIME OF INSPECTION"
- PermitMajor alteration
Permit 713929 · COMPLETED
UNDERPINNING OF EXISTING FOUNDATION WALLS PER SUBMITTED PLAN
- InvestigationHCEU INSP (Housing Code Enforcement Unit inspection)
Case 474259 · PASSED
A legacy L&I inspection label. The unit inspected housing for property-maintenance, fire-prevention, and related code compliance; the separate status says how that visit ended. The cited inspection visit was marked passed.
- PermitPlumbing
Permit 674890 · COMPLETED
WATER & DRAIN LINES FOR 2WC, 2 LAV, 2 TUB, 1 KS, 1WM.
- PermitElectrical
Permit 674964 · COMPLETED
TOTAL REWIRE AND NEW 100AMP SERVICES AND ALL NECESSARY BONDING AND GROUNDING PER 2008 NEC (SFD)SOUTH DISTRICT
- PermitAddition
Permit 654408 · COMPLETED
CONSTRUCT NEW 3RD FLOOR ADDITION TO AN EXISTING TWO STORY SFD, INTERIOR/EXTERIOR ALTERATIONS, NEW BASEMENT SLAB (NO UNDERPINNING REQUIRED OR CITED PER DESIGNER), NEW ROOF TOP DECK AND PILOT HOUSE FOR STAIR ACCESS ONLY. ADDITIONAL PERMITS REQ: ELECTRICAL, PLUMBING, HVAC.
- InvestigationHCEU INSP (Housing Code Enforcement Unit inspection)
Case 474259 · FAILED
A legacy L&I inspection label. The unit inspected housing for property-maintenance, fire-prevention, and related code compliance; the separate status says how that visit ended. The cited inspection visit was marked failed; later rows may show follow-up or resolution.
- PermitZoning
Permit 615262 · COMPLETED
FOR THE ERECTION OF AN ADDITION TO AN EXISTING ATTACHED STRUCTURE (THIRD FLOOR ADDITION WITH ROOF DECK AND PILOT HOUSE (FOR ROOF ACCESS ONLY) ABOVE THE THIRD FLOOR). SIZE AND LOCATION AS SHOWN ON PLANS/APPLICATION. STRUCTURE FOR USE AS SINGLE FAMILY HOUSEHOLD LIVING.
- ViolationVAC PROP REPLAC WIN/DRS 80%
Case 474259 · Violation 3786597 · Code PM-306.2/4 · COMPLIED
City marked this violation complied with; check the resolution date and live case for what was accepted.
- ViolationLICENSE-VAC RES BLDG (vacant residential building license required)
Case 474259 · Violation 3786596 · Code PM-102.4/2 · COMPLIED
This usually records a requirement to obtain a Vacant Structure License for an unoccupied residential building. Check later license and compliance rows because it does not establish present vacancy or an unresolved violation. City marked this violation complied with; check the resolution date and live case for what was accepted.
- InvestigationHCEU INSP (Housing Code Enforcement Unit inspection)
Case 474259 · FAILED
A legacy L&I inspection label. The unit inspected housing for property-maintenance, fire-prevention, and related code compliance; the separate status says how that visit ended. The cited inspection visit was marked failed; later rows may show follow-up or resolution.
- InvestigationCSUINITIAL
Case 459518 · PASSED
The cited inspection visit was marked passed.
- PermitMajor alteration
Permit 576413 · COMPLETED
MAKE SAFE PERMIT TO COMPLY CASE #459518. WORK TO INCLUDE:ROOF REPAIR, CEILING REPAIR AND REMOVE AND REPLACE BULGED AND FRACTURED FRONT WALL.
- ViolationROOF PARTIALLY COLLAPSED
Case 459518 · Violation 3383300 · Code PM-307.1/3 · COMPLIED
City marked this violation complied with; check the resolution date and live case for what was accepted.
- InvestigationCSUINITIAL
Case 459518 · FAILED
The cited inspection visit was marked failed; later rows may show follow-up or resolution.
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 27, 2026, 2:24 PM 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)