2026 assessment
$430K
OPA value, not a listing price
Mixed-use property report
520 N 12th St
2,268 sqftCMX3built 1900
Property at a glanceApartment building
Dai Zheng & Huang LLP
2027 published assessment
$429K
Future roll, not the current tax bill
Location
500 block of N 12th St
ZIP 19123
Neighborhood area
Northern Liberties · Callowhill
Approximate · based on ZIP 19123
Assessment and City record timeline
The line tracks this property’s published City assessment. Markers show deeds, permits, inspections, licenses, violations, certifications, and appeals on their recorded dates. Select one to read the filing.
Assessments are tax-roll values, not sale prices or appraisals. OPA has published a 2027 assessment of $428,600. It is not yet the billed-year tax basis.
- OPA assessment · 2016$227K 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$227K 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$368K 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$379K 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$383K 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$383K 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$383K 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$487K 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$487K 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$430K 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$430K 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$429K 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 · 2008-03-06PlumbingThis 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 · 2008-03-13PlumbingThis 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 · 2009-10-15ZoningThis 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 · 2012-11-06PlumbingThis 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 · 2021-06-04Addition and/or AlterationThis 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 · 2023-12-29Addition and/or AlterationThis 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 · 2023-08-17UNSAFE STRUCTUREA 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 · 2023-08-17EXTERIOR WALLSA 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 · 2023-08-17L&I investigationA 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 · 2023-09-22L&I investigationA 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 · 2023-10-27L&I investigationA 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 · 2024-01-29L&I investigationA 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 ↗
- License · 2005-08-02DAI HUANG LLP ZHENG: Vacant Residential Property / Lot 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 · 2012-12-22DAI HUANG LLP ZHENG: Vacant Residential Property / Lot 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 ↗
- Appeal · 2009-09-08Zoning board appealA challenge or request reviewed through a City appeals process. Filing an appeal does not show who prevailed; read the decision, conditions, and related permit or violation.How Philadelphia L&I appeals work ↗
- Appeal · 2019-12-18Zoning board appealA challenge or request reviewed through a City appeals process. Filing an appeal does not show who prevailed; read the decision, conditions, and related permit or violation.How Philadelphia L&I appeals work ↗
Property assessmentAssessmentL&I violationAppealPermitInspectionLicense
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 record16 events · exact dates, newest first
- InspectionL&I investigation
- PermitAddition and/or Alteration
- InspectionL&I investigation
- InspectionL&I investigation
- L&I violationUNSAFE STRUCTURE
- L&I violationEXTERIOR WALLS
- InspectionL&I investigation
- PermitAddition and/or Alteration
- AppealZoning board appeal
- LicenseDAI HUANG LLP ZHENG: Vacant Residential Property / Lot landlord or residential registration marked inactive
- PermitPlumbing
- PermitZoning
- AppealZoning board appeal
- PermitPlumbing
- PermitPlumbing
- LicenseDAI HUANG LLP ZHENG: Vacant Residential Property / Lot landlord or residential registration initially issued
Verify the public record
Property tax
$6,015/year estimated property tax
2026 taxable assessment $429,700 × 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 $428,600. It is not the 2026 billed-year value.
Payments, credits, interest, and the current amount due are maintained by the City.
OPA 8710851002026 taxable assessment equals the full assessed value.
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.”
Where the record looks off
Conflicts in City paperwork. Flags on the data, not the property.
"Built 1900" is usually a placeholder
Philadelphia records use 1900 as a stand-in when the real construction year was never documented. Treat the age as unknown, not as 120+ years.
Property report
Mixed-use property
Apartment building, recorded in the City's mixed-use category. The public record and owner trail follow.
What it is
Apartment building
Str/Off+Apt 3 Sty Masonry
Owner
Dai Zheng & Huang LLP
$ / sq ft
$189
assessed value ÷ interior sqft
Corridor
Spring Garden/9th-13th
city commercial corridor
Interior area
2,268 sqft
Lot size
695 sqft
Built
1900
Zoning
CMX3
Recorded owner
Who's behind it
Dai Zheng & Huang LLP · corporate / LLC owner
• Owns 2 properties across Philadelphia under this name, assessed at $750K combined
• Tax bills mail to 1318 S 10th St, Philadelphia PA, 19147
Block context
500 block of N 12th St. Compare parcels, ownership, and public-record history.
See the whole block →Next door: 524 N 12th St · 526 N 12th St
L&I license dates · data through Jul 21, 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 21, 2026.
Landlord and residential filings
These are property registrations or landlord filings, not businesses operating at this address.
DAI HUANG LLP ZHENGInactive
Vacant Residential Property / Lot · Initial issue date Aug 2, 2005 · Terminal license date Dec 22, 2012
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 16 dated rows
- InvestigationL&I investigation
Case CF-2023-082987 · PASSED
The cited inspection visit was marked passed.
- PermitAddition and/or Alteration
Permit CP-2023-006823 · Completed
MAKE SAFE PERMIT- For (MAKE SAFE - TO RESOLVE CASE CF-2023-082987. REPAIR EXTERIOR WALL DUE TO VEHICLE IMPACT.) to resolve case #CF-2023-082987. Abutting sidewalk must be closed with fencing a minimum of 6’ in height. Separate Streets Department permit required for sidewalk closure. A separate permit is required for any additional alterations that are not specifically addressed on case #CF-2023-082987. “In accordance with Code Bulletin PM-1801, a PA professional engineer is required to monitor repairs made under this permit. The engineer must submit a sealed statement to the Department confirming that the structure is in sound condition at completion.”
- InvestigationL&I investigation
Case CF-2023-082987 · FAILED
The cited inspection visit was marked failed; later rows may show follow-up or resolution.
- InvestigationL&I investigation
Case CF-2023-082987 · FAILED
The cited inspection visit was marked failed; later rows may show follow-up or resolution.
- ViolationUNSAFE STRUCTURE
Case CF-2023-082987 · Violation VI-2023-061220 · Code PM15-108.1 · COMPLIED
Resolution: COMPLIED - PERMIT OBTAINED City marked this violation complied with; check the resolution date and live case for what was accepted.
- ViolationEXTERIOR WALLS
Case CF-2023-082987 · Violation VI-2023-061221 · Code PM15-304.1(G) · COMPLIED
Resolution: COMPLIED - PERMIT OBTAINED City marked this violation complied with; check the resolution date and live case for what was accepted.
- InvestigationL&I investigation
Case CF-2023-082987 · FAILED
The cited inspection visit was marked failed; later rows may show follow-up or resolution.
- PermitAddition and/or Alteration
Permit CP-2021-002923 · Completed
For prescriptive alterations to shore the first floor and install three (3) new reinforced concrete columns within the basement of an existing three (3) story attached structure, as per plans; no other work on this permit.
- AppealZoning board appeal
Appeal 38514 · OPEN · Withdrawn
Related permit 997601 · PERMIT FOR THE RELOCATION OF LOT LINES TO CREATE THREE(3) LOTS FROM TWO(2) EXISTING LOTS (520 N 12TH STREET, 524 N 12TH STREET).(SIZE AND LOCATION AS SHOWN ON THE APPLICATION)
- License terminal eventDAI HUANG LLP ZHENG: Vacant Residential Property / Lot landlord or residential registration marked inactive
License 330606 · Inactive
License event. Registration does not prove present operation or storefront occupancy.
- PermitPlumbing
Permit 436329 · COMPLETED
LATERAL,HOUSE TRAP
- PermitZoning
Permit 214070 · COMPLETED
SUB-DIVISION OF 1 PARCEL INTO 3 SEPERATE PARCELS. PLOT B IS LOT AT 520-522 N. 12TH ST THIS IS AN EXISTING 4 STORY BLDG. TO BE USED AS COMMERCIAL ON GROUND FL. AND SFD'S ON 2ND FL. AND COMBINED SFD ON 3RD AND 4TH FL. PLOT C IS THREE STORY BLDG. WITH USE AS A COMMERCIAL SPACE ON GROUND FL. WITH 1 SFD ON 2ND FL. AND 1 SFD ON 3RD FL. PARKING FOR 3 CARS WITH CURB CUT ONTO RIDGE AVE. PLOT D TO BE A SFD
- AppealZoning board appeal
Appeal 9331 · CLOSED · Granted with conditions
Related permit 214070 · PERMIT FOR THE RELOCATION OF LOT LINES TO CREATE THREE(3) LOTS FROM ONE(1) LOT. LOT B: FOR AN EXISTING 4 STORY STRUCTURE FOR USE AS PERMITTED IN C2 COMMERCIAL DISTRICT ON THE FIRST FLOOR (USE REGISTRATION REQUIRED PRIOR TO OCCUPANCY) AND A
- PermitPlumbing
Permit 138250 · COMPLETED
REPLACE A SECTION OF 4" X 8" SEWER LINE AND INSTALL 1 FL DR
- PermitPlumbing
Permit 136516 · COMPLETED
REPLACE SEWER LINE FROM 5" CURB TRAP TO BASEMENT WALL.
- License issue eventDAI HUANG LLP ZHENG: Vacant Residential Property / Lot landlord or residential registration initially issued
License 330606 · Inactive
License event. Registration does not prove present operation or storefront occupancy.
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
- Imagery: Street photo © Google · Aerial © Esri, Maxar
Methodology & freshness
This report was assembled Jul 22, 2026, 11:00 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)