2026 taxable assessment $0 × 1.3998%. Estimate—not a bill or account balance.
OPA also publishes a 2027 assessment of $331,400; it is not the 2026 billed-year value.
Property report
1720 Diamond St
1 story · 2,364 sqft · RM1 · built 1915
Apartment building · Philadelphia Housing Auth · fully tax-exempt (2026 OPA). On the 1700 block of Diamond St.
Property summary
Assessment$328,2002026 OPA assessment · 2027: $331,400
Last sale—No sale value available
Est. tax bill$0/year2026 OPA · full assessment exemption shown
Tax delinquencyNo 2022 matchNot proof account is current
Permits15Every fetched City permit
Violations0 openNo historical match in fetched records
“Open” reflects records available then historical records keep their source dates estimates are labeled
BlockReport AI · cited public records
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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 3211768012026 OPA shows a zero or de minimis taxable assessment. The open assessment split does not establish the exemption's legal basis, continuing eligibility, or treatment after a transfer.
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 mechanical permit in 2011.
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
- Philadelphia Housing Auth
- Tax mailing address
- 2013 RIDGE AVE, PHILADELPHIA PA, 19121
- L&I district
- NORTH
- Building ID (BIN)
- 1007039
- OPA account
- 321176801
Permits15Every dated permit
Violation cases0No match
Investigations0No match
Building certifications3Latest result: Certified
Business licenses0No match
Appeals0No match
PermitsPermit number, issued date, work and City status15
ElectricalPermit 346881
Jun 14, 2011 COMPLETED Completed Dec 26, 2012
INSTALL INTERCONNECTED 120VOLT SMOKE DETECTORS AS PER 2008 NEC (NORTH DISTRICT)
ElectricalPermit 346882
Jun 14, 2011 COMPLETED Completed Dec 26, 2012
INSTALL INTERCONNECTED 120VOLT SMOKE DETECTORS AS PER 2008 NEC (NORTH DISTRICT)
ElectricalPermit 346883
Jun 14, 2011 COMPLETED
INSTALL INTERCONNECTED 120VOLT SMOKE DETECTORS AS PER 2008 NEC (NORTH DISTRICT)
AlterationPermit 333861
Jul 12, 2011 COMPLETED Completed Apr 2, 2012
RE-COVER EXISTING ROOF WITH GAF RUBBEROID GRANULE MEMBRANE
AlterationPermit 333862
Jul 12, 2011 COMPLETED Completed Apr 2, 2012
RE-COVER EXISTING ROOF WITH GAF RUBBEROID GRANULE MEMBRANE
AlterationPermit 333863
Jul 12, 2011 COMPLETED Completed Apr 2, 2012
RE-COVER EXISTING ROOF WITH GAF RUBBEROID GRANULE MEMBRANE
PlumbingPermit 347396
Jul 13, 2011 COMPLETED Completed Feb 7, 2012
TOILET, LAV FAUCET, K/S, WATER HEATER, DIVERTER/VALVE
PlumbingPermit 347397
Jul 13, 2011 COMPLETED Completed Mar 29, 2012
TOILET, ADA LAV, K/S, WATER HEATER, DIVERTER/VALVE
MechanicalPermit 345056
Jul 27, 2011 COMPLETED Completed Feb 29, 2012
INSTALL ONE GOODMAN GMS090 WARM AIR FURNACE
MechanicalPermit 360298
Aug 26, 2011 COMPLETED Completed Mar 29, 2012
INSTALL ONE GOODMAN GM090 WARM AIR FURNACE NO CHANGES TO EXTERIOR
MechanicalPermit 360359
Aug 26, 2011 COMPLETED Completed Mar 29, 2012
INSTALL ONE GOODMAN GM090 WARM AIR FURNACE NO CHANGF TO EXTERIOR
PlumbingPermit 377400
Dec 6, 2011 COMPLETED Completed Jun 27, 2012
INSTALLATION OF TOILET, LAV FAUCET, KITCHEN SINK, WATER HEATER AND DIVERTER/VALVE
MechanicalPermit 375671
Dec 14, 2011 COMPLETED Completed Apr 10, 2012
REPLACE ONE INDOOR FURNACE LOCATED WITHIN DWELLING UNIT. NO PENETRATION OF ANY FIRE-RATED ASSEMBLIES.
MechanicalPermit 372747
Dec 15, 2011 COMPLETED Completed Jul 29, 2012
REPLACE ONE (1) INDOOR FURNACE LOCATED WITHIN DWELLING UNIT. NO PENETRATION OF ANY FIRE-RATED ASSEMBLIES
MechanicalPermit 375798
Dec 15, 2011 COMPLETED Completed Jan 4, 2012
REPLACE ONE (1) FURNACE LOCATED IN DWELLING UNIT. NO PENERATION OF ANY FIRE-RATED ASSEMBLY.
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 ID3
Fire Alarm CertificationCertification BC-2023-013230
Inspected May 17, 2023 Certified Expires May 17, 2024
Fire Alarm CertificationCertification BC-2024-018464
Inspected Jun 13, 2024 Certified Expires Jun 13, 2025
Fire Alarm CertificationCertification BC-2025-019734
Inspected Jul 24, 2025 Certified Expires Jul 24, 2026
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 resolve before relying
2 verify
1 favorable dated record
Resolve before relyingZoning approval is not the occupancy fileThe record identifies more than one dwelling/use.
Why it mattersPhiladelphia says a zoning approval or Property Sales Certification can identify a use without proving that it was established under the Building Code. A change of use, unit count, exits, or fire rating can require a Building Permit and Certificate of Occupancy.
Verify nextVerify the lawful use, unit count, associated construction permits, and Certificate of Occupancy with L&I.
Open the controlling City guidance ↗VerifyOPA shows a full exemption; its legal basis is unverifiedOPA currently marks the land and building assessment fully tax-exempt; BlockReport does not receive the exemption determination or basis.
Why it mattersFull OPA exemptions can have different legal bases, including government, religious, charitable/institutional, veteran, or other treatment. The current owner/use record is not a buyer’s tax forecast.
Verify nextConfirm the exact exemption basis, buyer eligibility, and next tax-year treatment directly with OPA.
Open the controlling City guidance ↗VerifyA separate Commercial Trash account may applyOPA classifies the parcel as multi-family. BlockReport does not receive a current Commercial Trash account balance.
Why it mattersPhiladelphia charges qualifying small commercial, mixed-use, and multi-unit properties that use City collection; exemptions and private collection can change applicability. A use category alone does not prove a fee is due.
Verify nextCheck the Commercial Trash account inside the date-effective Property Payoff.
Open the controlling City guidance ↗Favorable dated recordFiled system certifications are current in this datasetFire Alarm Certification: Certified through Jul 24, 2026
Why it mattersFire-protection certifications apply to the named system and inspection period only; they are not a whole-building safety certificate. Philadelphia generally requires annual sprinkler, standpipe, fire-alarm, special-hazard, and emergency-power inspections where those systems exist.
Verify nextConfirm the certificate covers every applicable system and remains accepted by L&I.
Open the controlling City guidance ↗Closing file: checks no public-record summary can replace3 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 ↗Informational only—not a legal opinion, title report, code inspection, tax payoff, or substitute for a Pennsylvania lawyer, title company, inspector, or tax professional.
Not a houseProperty report
This is a apartment building, not a home, and OPA shows a full or near-full assessment exemption whose basis must be verified. A $0 assessment-based tax estimate does not prove the live Tax Center account has no prior-period balance or other charges. Homeowner investment tools are hidden; the assembled public-source record remains below.
What it is
Apartment building
Row Conv/Apt 3 Sty Mason
Owner
Philadelphia Housing Auth
Public / institutional
OPA tax treatment
Full assessment exemption shown
2026 OPA taxable assessment $0 · basis and live balance require separate verification
$ / sq ft
$140
assessed value ÷ interior sqft
Assessed value
$328,200
2026 OPA · 2027: $331,400
Interior area
2,364 sqft
Lot size
1,530 sqft
Stories
1
Built
1915
Zoning
RM1
Who's behind it
Philadelphia Housing Auth · corporate / LLC owner
• Owns 4773 properties across Philadelphia under this name, assessed at $1.4B combined
• Tax bills mail to 2013 Ridge Ave, Philadelphia PA, 19121
Block context
1720 Diamond St sits on the 1700 block of Diamond St. Open the block report to compare its parcels, ownership and public-record history.
See the whole block →Next door: 1718 Diamond St · 1722 Diamond 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, 1:38 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)