2026 assessment
$776K
OPA value, not a listing price
House report
825 S Darien St
3 bd3 ba1,787 sqftCMX2built 2012
Property at a glanceHouse
Entity-held
ZIP 19147 area
Queen Village · East Passyunk
800 block of S Darien 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$503K 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$503K 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$503K 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$675K 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$732K 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$732K 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$732K 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$713K 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$713K 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$776K 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$776K 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$708K 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 ↗
- Land buy · 2004Land record $1.6MA land-record event associated with this parcel. Review the recorded instrument to determine whether it reflects a conveyance, parcel change, or another filing.How to read the recorded document ↗
- Land buy · 2012Land record $180KA land-record event associated with this parcel. Review the recorded instrument to determine whether it reflects a conveyance, parcel change, or another filing.How to read the recorded document ↗
- Deed / sale · 2016Deed / sale $666KA 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 · 2012-01-25New 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 · 2012-03-21MechanicalThis 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 · 2012-03-21PlumbingThis 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 · 2012-04-17PlumbingThis 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 · 2012-05-09SuppressionThis 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 · 2012-05-23ElectricalThis 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 ↗
- License · 2012-03-07WILLIAM & MAUREEN DIEHL: 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 · 2016-04-29WILLIAM & MAUREEN DIEHL: 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 ↗
- License · 2006-12-16807 MILDRED STREET LP: 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 · 2012-12-22807 MILDRED STREET LP: 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 ↗
Property assessmentBlock median & rangeZIP 19147 (Queen Village · East Passyunk) medianAssessmentDeed / saleLand buyPermitLicense
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 record13 events · exact dates, newest first
- LicenseWILLIAM & MAUREEN DIEHL: Rental landlord or residential registration marked inactive
- Deed / saleDeed / sale $666K
- License807 MILDRED STREET LP: Vacant Residential Property / Lot landlord or residential registration marked inactive
- PermitElectrical
- PermitSuppression
- PermitPlumbing
- PermitMechanical
- PermitPlumbing
- LicenseWILLIAM & MAUREEN DIEHL: Rental landlord or residential registration initially issued
- PermitNew construction
- Land buyLand record $180K
- License807 MILDRED STREET LP: Vacant Residential Property / Lot landlord or residential registration initially issued
- Land buyLand record $1.6M
Informational only. Not investment advice or a consumer report (FCRA).
Verify the public record
Property tax
$9,464/year estimated property tax
2026 taxable assessment $676,100 × 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 $708,300. It is not the 2026 billed-year value.
Payments, credits, interest, and the current amount due are maintained by the City.
OPA 0222732802026 OPA taxes $676,100 of $776,100 assessed. The assessment fields alone do not identify a program, approval date, expiration, or buyer eligibility.
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.
Assessment and sale price disagree hard
Assessed at $708K, but it traded for $25,000 in 2026 — a 28.3× gap. Could be a non-market deed the record doesn't label, or an assessment that hasn't caught up.
The property, on paper
OPA physical field record.
Bedrooms
3
Bathrooms
3
Interior
1,787 sqft
livable area
Lot
871 sqft
Basement
Full, finished
city code A
Heat
Forced hot air
city code A
Central air
Yes
Garage
1 space
Exterior condition
Above average
city code 3
Above averageBelow average
Interior condition
Above average
city code 3
Above averageBelow average
Quality grade
A
assessor's grade
ABCDE
Zoning
CMX2
city zoning code
OPA field-assessment attributes. Condition and grade are the assessor's codes, not an inspection.
Recorded owner
Who's behind it
Mild Mustard LLC · corporate / LLC owner
• Owns 2 properties across Philadelphia under this name, assessed at $1.1M combined
• Tax bills mail to 1312 Spruce St, Philadelphia PA, 19107
Block context
800 block of S Darien St. Compare parcels, ownership, and public-record history.
See the whole block →Next door: 823 S Darien St · 821 S Darien 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.
WILLIAM & MAUREEN DIEHLInactive
Rental · Initial issue date Mar 7, 2012 · Terminal license date Apr 29, 2016
807 MILDRED STREET LPInactive
Vacant Residential Property / Lot · Initial issue date Dec 16, 2006 · 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 13 dated rows
- License terminal eventWILLIAM & MAUREEN DIEHL: Rental landlord or residential registration marked inactive
License 556926 · Inactive
License event. Registration does not prove present operation or storefront occupancy.
- Recorded transfer$666K transfer
2016
- License terminal event807 MILDRED STREET LP: Vacant Residential Property / Lot landlord or residential registration marked inactive
License 394620 · Inactive
License event. Registration does not prove present operation or storefront occupancy.
- PermitElectrical
Permit 406861 · COMPLETED
INSTALL 200A SERV,40 CIR MB PANL,GROUNDING,CIRC,REFRIG,DISPOSAL,MICRO,2 COUNTER GFCI,3 LIGHT,3 BEDRM & LIV RM RECPTS,BATH GFCI,HEATER,240V AC CIRC,120V SMOKE/CO DET THROUGHOUT,ALL DEVS TAMP RES,ALL BREAKER ARC FAULT AS PER 2008 NEC(SOUTH DIST)(SFD)
- PermitSuppression
Permit 402655 · COMPLETED
INSTALL FIRE SPRINKLER SYSTEM, 13R, 2"
- PermitPlumbing
Permit 399673 · COMPLETED
SEWER LATERAL AND WATER DISTIBUTION OUTSIDE .PA1#20121073010. ST OPENING,FERRULE,FTWY,METER
- PermitMechanical
Permit 394706 · COMPLETED
INSTALL 1 HVAC UNIT (SFD)
- PermitPlumbing
Permit 394756 · COMPLETED
SFD-INSTALL 2WC,2 TUB,2 LAV,1 KS
- License issue eventWILLIAM & MAUREEN DIEHL: Rental landlord or residential registration initially issued
License 556926 · Inactive
License event. Registration does not prove present operation or storefront occupancy.
- PermitNew construction
Permit 380324 · COMPLETED
NEW CONSTRUCTION OF A SFD AS PER PLANS.THIS BUILDING SHALL BE FULLY SPREINLERED IN ACCORDANCE WITH NFPA 13.
- Land recordLand record
2012
- License issue event807 MILDRED STREET LP: Vacant Residential Property / Lot landlord or residential registration initially issued
License 394620 · Inactive
License event. Registration does not prove present operation or storefront occupancy.
- Land recordLand record
2004
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 25, 2026, 11:42 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)