2026 assessment
$2.7M
OPA value, not a listing price
Property report
817 N 20th St
4 stories15,000 sqftRSA5built 2018
Property at a glanceApartment building
Woods Charter School Development LLC
2027 published assessment
$3.0M
Future roll, not the current tax bill
Location
800 block of N 20th St
ZIP 19130
Neighborhood area
Fairmount · Spring Garden
Approximate · based on ZIP 19130
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 $2,956,400. It is not yet the billed-year tax basis.
- OPA assessment · 2016$508K 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$508K 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$508K 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$3.5M 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$3.5M 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$3.5M 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$3.3M 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$3.3M 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$2.7M 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$2.7M 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$3.0M 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 ↗
- Teardown · 2018DemolishedThis permit category usually covers partial or complete removal work. The approved scope—not the short category—defines what was authorized, and issuance alone does not prove completion.Philadelphia construction and repair permits ↗
- Deed / sale · 2021Deed / sale $5.4MA 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 · 2018-04-11ZoningThis 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 · 2018-04-12PlumbingThis 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 ↗
- Permit · 2018-04-17Zoning/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 · 2018-05-18DemolitionThis permit category usually covers partial or complete removal 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 · 2018-07-06New 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 · 2018-11-02MechanicalThis 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 · 2018-11-15SuppressionThis 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 · 2018-12-06PlumbingThis 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 · 2018-12-28PlumbingThis 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 · 2019-01-08ElectricalThis 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 · 2019-02-22PlumbingThis 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 · 2020-05-02Rough-InThis 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 ↗
- License · 2021-11-22Woods Charter School Development LLC (Stamm Development Group 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 · 2019-06-25SDG 817-821 N 20th Street 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 · 2023-08-23SDG 817-821 N 20th Street 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 ↗
- Certification · 2022-01-24Sprinkler CertificationA filed inspection or certification for a regulated building system or component. Check the result, expiration date, and latest filing before treating it as current.What Philadelphia inspections check ↗
- Certification · 2025-10-26Fire Alarm CertificationA filed inspection or certification for a regulated building system or component. Check the result, expiration date, and latest filing before treating it as current.What Philadelphia inspections check ↗
- Certification · 2025-10-26Emergency and Standby Power Systems CertificationA filed inspection or certification for a regulated building system or component. Check the result, expiration date, and latest filing before treating it as current.What Philadelphia inspections check ↗
- Appeal · 2018-08-01Zoning 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 assessmentAssessmentDeed / saleTeardownAppealPermitLicenseCertification
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
- CertificationFire Alarm Certification
- CertificationEmergency and Standby Power Systems Certification
- LicenseSDG 817-821 N 20th Street LLC: Rental landlord or residential registration marked inactive
- CertificationSprinkler Certification
- LicenseWoods Charter School Development LLC (Stamm Development Group LLC): Rental landlord or residential registration initially issued
- Deed / saleDeed / sale $5.4M
- PermitRough-In
- LicenseSDG 817-821 N 20th Street LLC: Rental landlord or residential registration initially issued
- PermitPlumbing
- PermitElectrical
- PermitPlumbing
- PermitPlumbing
- PermitSuppression
- PermitMechanical
- AppealZoning board appeal
- PermitNew construction
- PermitDemolition
- PermitZoning/use
- PermitPlumbing
- PermitZoning
- TeardownDemolished
Verify the public record
Property tax
$3,786/year estimated property tax
2026 taxable assessment $270,480 × 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 $2,956,400. It is not the 2026 billed-year value.
Payments, credits, interest, and the current amount due are maintained by the City.
OPA 8815511672026 OPA taxes $270,480 of $2,704,800 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.”
Property report
Commercial property
Apartment building, recorded in the City's multi-family category. The public record and owner trail follow.
What it is
Apartment building
Apts 5-50 Units Masonry
Owner
Woods Charter School Development LLC
$ / sq ft
$197
assessed value ÷ interior sqft
Licensed units
14
active rental license
Interior area
15,000 sqft
Lot size
5,166 sqft
Stories
4
Built
2018
Zoning
RSA5
Recorded owner
Who's behind it
Woods Charter School Development LLC · corporate / LLC owner
• Owns 8 properties across Philadelphia under this name, assessed at $15M combined
• Tax bills mail to 10 E Palisade Ave, Englewood NJ, 07631 — outside Philadelphia
• Holds an active rental license for this address
Block context
800 block of N 20th St. Compare parcels, ownership, and public-record history.
See the whole block →Next door: 815 N 20th St · 813 N 20th 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.
Woods Charter School Development LLC (Stamm Development Group LLC)Active
Rental · Initial issue date Nov 22, 2021 · Filed expiration Nov 21, 2026
SDG 817-821 N 20th Street LLCInactive
Rental · Initial issue date Jun 25, 2019 · Terminal license date Aug 23, 2023
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
- CertificationFire Alarm Certification
Certification BC-2025-028782 · Certified
Expires 2026-10-26
- CertificationEmergency and Standby Power Systems Certification
Certification BC-2025-028781 · Certified
Expires 2026-10-26
- License terminal eventSDG 817-821 N 20th Street LLC: Rental landlord or residential registration marked inactive
License 816522 · Inactive
License event. Registration does not prove present operation or storefront occupancy.
- CertificationSprinkler Certification
Certification BC-2022-003375 · Certified
Expires 2023-01-24
- License issue eventWoods Charter School Development LLC (Stamm Development Group LLC): Rental landlord or residential registration initially issued
License 881877 · Active
License event. Registration does not prove present operation or storefront occupancy.
- Recorded transfer$5.4M transfer
2021
- PermitRough-In
Permit 948743-RI · Expired
RUN DRAIN & WATER FROM BASEMENT TO 24-TOILETS, 24-LAVS, 24-TUBS & 14-KITCHEN SINK AND 6-STACKS, 14-HOT WATER HEATERS. HOUSE DRAIN & AREA DRAIN THE INSTALLATION WILL COMPLY WITH THE PHILADELPHIA PLUMBING CODE 2004
- License issue eventSDG 817-821 N 20th Street LLC: Rental landlord or residential registration initially issued
License 816522 · Inactive
License event. Registration does not prove present operation or storefront occupancy.
- PermitPlumbing
Permit 949040 · COMPLETED
NEW CONSTRUCTION: INTERIOR PLUMBING;4) STORY DETACHED STRUCTURE OF TYPE VA CONSTRUCTION FOR FOURTEEN (14) DWELLING UNITS WITH CELLAR, ROOF DECK; DRAIN AND WATER LINES FROM BASEMENT TO 24 TOILETS, 24 SINKS, 24 TUB/SHOWERS, 14 KITCHEN, 14 LAUNDRY. THE INSTALLATION WILL COMPLY WITH THE 2004 PHILA PLUMBING CODE.
- PermitElectrical
Permit 917343 · COMPLETED
INSTALL 600AMP 3P MAIN SERVICE INSTALL 15 GANG METER MODULE INSTALL WIRING THROUGHOUT 14APTS AND COMMON AREA INSTALL FIRE ALARM SYSTEM THROUGHOUT
- PermitPlumbing
Permit 938138 · COMPLETED
REPLACE HOUSE TRAP, FRESH AIR INLET AS PER PHILADELPHIA 2004 PLUMBING CODE.
- PermitPlumbing
Permit 933162 · COMPLETED
WATER SERVICE, HOUSE DRAIN, CURB TRAP & FAI PA20183381876 "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"
- PermitSuppression
Permit 894287 · COMPLETED
FOR THE INSTALLATION OF A FIRE SPRINKLER SYSTEM IN ACCORDANCE WITH NFPA 2007, STANDARD 13R TO INCLUDE A 2-INCH DIAMETER SERVICE LINE AND 2.5-INCH DIAMETER BACKFLOW PREVENTION ASSEMBLY.
- PermitMechanical
Permit 915162 · COMPLETED
FOR THE INSTALLATION OF AN HVAC MECHANICAL SYSTEM TO INCLUDE (14) SPLIT SYSTEM HEAT PUMP SYSTEMS, ASSOCIATED CONDENSING UNITS, EXHAUST FANS, CLOTHES DRYER EXHAUST DUCTWORK, GRILLES/REGISTERS/DIFFUSERS, AND ALL ASSOCIATED DUCTWORK. ALL DUCT WORK WILL BE SELF CONTAINED IN EACH TENANT SPACE.
- AppealZoning board appeal
Appeal 33885 · OPEN · Denied
Related permit 868016 · APPEAL AGAINST L&I PERMIT 868016
- PermitNew construction
Permit 880555 · COMPLETED
FOR THE ERECTION OF A FOUR (4) STORY DETACHED STRUCTURE OF TYPE VA CONSTRUCTION FOR FOURTEEN (14) DWELLING UNITS WITH CELLAR, ROOF DECK AND PILOT HOUSES AS PER PLANS. SEPARATE PERMITS REQUIRED FOR ALL MECHANICAL, ELECTRICAL, PLUMBING AND FIRE SUPPRESSION WORK.
- PermitDemolition
Permit 873734 · COMPLETED
FOR THE COMPLETE DEMOLITION OF EXISTING TWO AND THREE STORY ATTACHED STRUCTURES. STRUCTURE TO BE DEMOLISHED BY HAND AND WITH HAND-HELD TOOLS ONLY. PEDESTRIAN PROTECTION TO BE IN PLACE PRIOR TO START OF WORK AND TO BE MAINTAINED DURING ALL DEMOLITION ACTIVITIES. * A COVERED WALKWAY OR SIDEWALK CLOSURE SHALL BE REQUIRED IN ACCORDANCE WITH SECTION 3306 OF THE IBC. SEPARATE BUILDING AND/OR STREETS DEPARTMENT PERMITS ARE REQUIRED. * 21 DAY POSTING AND NOTICE REQUIRED PER A-303.2 * NEWLY EXPOSED WALLS TO BE TREATED
- PermitZoning/use
Permit 868016 · COMPLETED
FOR THE COMPLETE DEMOLITION OF AN EXISTING STRUCTURE ON LOT; FOR THE ERECTION OF AN ATTACHED STRUCTURE WITH GREEN ROOF AND TWO (2) ROOF DECKS ACCESSED BY FOUR (4) INDIVIDUAL ROOF DECK ACCESS STRUCTURES, FOR USE AS MULTI-FAMILY (TOTAL FOURTEEN (14) DWELLING UNITS) HOUSEHOLD LIVING, SIZE AND LOCATIONS AS SHOWN IN THE PLANS/APPLICATION.
- PermitPlumbing
Permit 866798 · COMPLETED
SEAL 5" SEWER LATERAL, REMOVE TRAP PA ONE CALL #2018-0952448
- PermitZoning
Permit 862888 · COMPLETED
FOR THE LOT ADJUSTMENT TO CONSOLIDATE THREE (3) EXISTING ZONING LOTS (817 N 20TH ST, 819 N 20TH ST, 821 N 20TH ST) INTO ONE (1) LOT (PARCEL 'C'), SIZE AND LOCATION AS SHOWN ON THE SUBMITTED PLANS.
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 26, 2026, 2:38 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)