2026 assessment
$424K
OPA value, not a listing price
House report
1819 Mountain St
3 bd3 ba1,320 sqftRSA5built 2017
Property at a glanceHouse
Entity-held
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$8K 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$40K 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$322K 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$321K 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$345K 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$345K 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$345K 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$471K 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$471K 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$424K 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$424K 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$317K 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 $345KA 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 · 2026Deed / sale $435KA 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 · 2014-09-11Zoning/useThis 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 · 2014-10-24New constructionThis 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 · 2014-11-21SuppressionThis permit category usually covers fire-suppression systems or related life-safety 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 · 2015-09-22SuppressionThis permit category usually covers fire-suppression systems or related life-safety 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 · 2016-01-29PlumbingThis 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 · 2016-06-16ElectricalThis 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 · 2016-06-16MechanicalThis 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 · 2016-07-12PlumbingThis 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 ↗
- L&I violation · 2011-03-04CLIP VIOLATION NOTICEA 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 · 2011-03-04VACANT 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 · 2013-12-11CLIP VIOLATION NOTICEA 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 · 2013-12-11LICENSE-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 · 2015-08-11EXT A-VACANT LOT CLEAN/MAINTAIA 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 · 2015-08-11CLIP VIOLATION NOTICEA 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 · 2016-08-22WORKMANLIKE- BUILDING CODEA 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 ↗
- License · 2023-06-14Aye Myat Mon: Rental landlord or residential registration initially issuedA City license record tied to an activity or property use. Its issue, expiration, inactive, and status fields—not the category alone—show what was recorded for this date.Philadelphia L&I licenses and property records ↗
- License · 2026-06-13Aye Myat Mon: Rental landlord or residential registration marked expiredA City license record tied to an activity or property use. Its issue, expiration, inactive, and status fields—not the category alone—show what was recorded for this date.Philadelphia L&I licenses and property records ↗
- License · 2017-06-133027 DARIEN ST LLC: Rental landlord or residential registration initially issuedA City license record tied to an activity or property use. Its issue, expiration, inactive, and status fields—not the category alone—show what was recorded for this date.Philadelphia L&I licenses and property records ↗
- License · 2018-08-113027 DARIEN ST LLC: Rental landlord or residential registration marked inactiveA City license record tied to an activity or property use. Its issue, expiration, inactive, and status fields—not the category alone—show what was recorded for this date.Philadelphia L&I licenses and property records ↗
Property assessmentBlock median & rangeZIP 19145 (Girard Estate · South Philadelphia) medianAssessmentDeed / saleL&I violationPermitLicense
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 record21 events · exact dates, newest first
- LicenseAye Myat Mon: Rental landlord or residential registration marked expired
- Deed / saleDeed / sale $435K
- LicenseAye Myat Mon: Rental landlord or residential registration initially issued
- License3027 DARIEN ST LLC: Rental landlord or residential registration marked inactive
- Deed / saleDeed / sale $345K
- License3027 DARIEN ST LLC: Rental landlord or residential registration initially issued
- L&I violationWORKMANLIKE- BUILDING CODE
- PermitPlumbing
- PermitElectrical
- PermitMechanical
- PermitPlumbing
- PermitSuppression
- L&I violationEXT A-VACANT LOT CLEAN/MAINTAI
- L&I violationCLIP VIOLATION NOTICE
- PermitSuppression
- PermitNew construction
- PermitZoning/use
- L&I violationCLIP VIOLATION NOTICE
- L&I violationLICENSE-VAC LOT
- L&I violationCLIP VIOLATION NOTICE
- L&I violationVACANT LOT STANDARD
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
$1,187/year estimated property tax
2026 taxable assessment $84,820 × 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 $317,400. It is not the 2026 billed-year value.
Payments, credits, interest, and the current amount due are maintained by the City.
OPA 3630953002026 OPA taxes $84,820 of $424,100 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.
$84,820 taxable basis
Difference to verify+$4,750/year
$424,100 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: ($424,100 assessed − $339,280 exempt) × 1.3998% ≈ $1,187/year
Full-assessment scenario: $424,100 × 1.3998% ≈ $5,937/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
3
Bathrooms
3
Interior
1,320 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.
Recorded owner
Who's behind it
Opendoor Property J LLC · corporate / LLC owner
• Owns 2 properties across Philadelphia under this name, assessed at $818K combined
• Tax bills mail to 1295 W Washington St -- Suite 115, Tempe AZ, 85288 — outside Philadelphia
Block context
1800 block of Mountain St. Compare parcels, ownership, and public-record history.
See the whole block →Next door: 1817 Mountain St · 1821 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.
Landlord and residential filings
These are property registrations or landlord filings, not businesses operating at this address.
Aye Myat MonExpired
Rental · Initial issue date Jun 14, 2023 · Terminal license date Jun 13, 2026
3027 DARIEN ST LLCInactive
Rental · Initial issue date Jun 13, 2017 · Terminal license date Aug 11, 2018
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 21 dated rows
- License terminal eventAye Myat Mon: Rental landlord or residential registration marked expired
License 926241 · Expired
License event. Registration does not prove present operation or storefront occupancy.
- Recorded transfer$435K transfer
2026
- License issue eventAye Myat Mon: Rental landlord or residential registration initially issued
License 926241 · Expired
License event. Registration does not prove present operation or storefront occupancy.
- License terminal event3027 DARIEN ST LLC: Rental landlord or residential registration marked inactive
License 741874 · Inactive
License event. Registration does not prove present operation or storefront occupancy.
- Recorded transfer$345K transfer
2018
- License issue event3027 DARIEN ST LLC: Rental landlord or residential registration initially issued
License 741874 · Inactive
License event. Registration does not prove present operation or storefront occupancy.
- ViolationWORKMANLIKE- BUILDING CODE
Case 556959 · Violation 4065974 · Code A-104.1/1 · COMPLIED
City marked this violation complied with; check the resolution date and live case for what was accepted.
- PermitPlumbing
Permit 706455 · COMPLETED
INSTALL 5" LATERAL,WATER SERVICE AND CURB TRAP (SFD)PA20161793637 SELF CERTIFICATION'S ARE NO LONGER PERMITTED","ALL EXCAVATIONS AND PLUMBING TRENCHES IN EXCESS OF 5 FT IN DEPTH MUST HAVE APPROVED SHORING IN PLACE AT THE TIME OF INSPECTION"
- PermitElectrical
Permit 700363 · COMPLETED
INSTALL 200AMP SERVICE,COMPLETE REWIRE INCLUDING RECEPTS,SWITCHES,OUTLETS,LIGHTS,FIXTURES,SMOKES ANDS CO DETECTORS AS PER 2008 NEC (NORTH DISTRICT)
- PermitMechanical
Permit 700782 · COMPLETED
INSTALL 80,000 BTU WARM AIR HEATER 2 1/2 TON A/C AND NEW DUCT WORK
- PermitPlumbing
Permit 666545 · COMPLETED
3 WC,3 BATH TUB,3 SINKS,1 KITCHEN SINK,1 STAND PIPE (SFD)THE INSTALLATION WILL COMPLY WITH THE PHILADELPHIA PLUMBING CODE 2004
- PermitSuppression
Permit 634941 · COMPLETED
FOR THE INSTALLATION OF AN AUTOMATIC SPRINKLER SYSTEM W. ONE (1_) INCH COMBINED FIRE & DOMESTIC SERVICE LINE TO SERVE PREVIOUSLY APPROVED THREE (3) STORY ABOVE GRADE PLANE RESIDENTIAL BUILDING (TOWNHOUSE). AUTOMATIC SPRINKLER SYSTEM INSTALLATION IN ACCORDANCE WITH NFPA 13D.
- ViolationEXT A-VACANT LOT CLEAN/MAINTAI
Case 496804 · Violation 3673013 · Code PM-302.2/4 · COMPLIED
City marked this violation complied with; check the resolution date and live case for what was accepted.
- ViolationCLIP VIOLATION NOTICE
Case 496804 · Violation 3673012 · Code CP-01 · COMPLIED
City marked this violation complied with; check the resolution date and live case for what was accepted.
- PermitSuppression
Permit 575211 · EXPIRED
FOR THE INSTALLATION OF A ONE (1) INCH COMBINED SERVICE LINE FOR A FIRE & DOMESTIC SUPPLY LINE FOR A SINGLE FAMILY DWELLING. MULTIPURPOSE RESIDENTIAL FIRE SPRINKLER SYSTEM DESIGNED IN ACCORDANCE WITH NFPA 13D. ALL WORK SHALL BE DONE IN ACCORDANCE WITH APPROVED PLANS.
- PermitNew construction
Permit 556959 · COMPLETED
NEW CONSTRUCTION OF AN ATTACHED 3 STORY SINGLE FAMILY DWELLING WITH FRONT SETBACK, PILOT HOUSE, AND ROOF DECK AS PER THE SEALED SUBMITTED PLAN. ELECTRICAL, PLUMBING, MECHANICAL, AND FIRE SUPPRESSION WORK REQUIRES ADDITIONAL PERMITS. CALL THE INSPECTOR PRIOR TO STARTING WORK.
- PermitZoning/use
Permit 548196 · COMPLETED
NEW CONSTRUCTION OF AN ATTACHED STRUCTURE WITH ROOF ACCESS STAIR ENCLOSURE AND ROOF DECK, SIZE AND LOCATION AS SHOWN IN THE SUBMITTED PLAN/APPLICATION. FOR USE AS SINGLE FAMILY HOUSEHOLD LIVING.
- ViolationCLIP VIOLATION NOTICE
Case 413742 · Violation 3033126 · Code CP-01 · COMPLIED
City marked this violation complied with; check the resolution date and live case for what was accepted.
- ViolationLICENSE-VAC LOT
Case 413742 · Violation 3033127 · Code PM-102.4/1 · COMPLIED
City marked this violation complied with; check the resolution date and live case for what was accepted.
- ViolationCLIP VIOLATION NOTICE
Case 268175 · Violation 1998430 · Code CP-01 · COMPLIED
City marked this violation complied with; check the resolution date and live case for what was accepted.
- ViolationVACANT LOT STANDARD
Case 268175 · Violation 1998431 · Code PM-306.0/2 · COMPLIED
City marked this violation complied with; check the resolution date and live case for what was accepted.
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)