2026 taxable assessment $413,600 × 1.3998%. Estimate—not a bill or account balance.
OPA also publishes a 2027 assessment of $431,700; it is not the 2026 billed-year value.
Multi-family report
1834 Diamond St
7 bd · 4 ba · 3 stories · 2,457 sqft · RM1 · built 1915
Absentee individual · assessed $414K (2026) · 2027 OPA assessment $432K · sold 3×. On the 1800 block of Diamond St.
Property summary
Assessment$413,6002026 OPA assessment · 2027: $431,700
Last sale$380KRecorded 2017
Est. tax bill$5,790/year2026 taxable assessment × 1.3998%
Tax delinquencyNo 2022 matchNot proof account is current
Permits2Every fetched City permit
Violations0 open12 historical across 4 cases
“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 3211798002026 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.”
What stands out
From the public recordRenovated & sold on
Why it mattersBought for $77K in 2005, electrical permit in 2007, sold for $380K in 2017 (+394%).
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
- Blumenthal Robert David
- Tax mailing address
- 2431 CHRISTIAN ST, PHILADELPHIA PA, 19146
- L&I district
- NORTH
- Building ID (BIN)
- —
- OPA account
- 321179800
Permits2Every dated permit
Violation cases412 violation records · 0 open
Investigations157 failed · 4 passed · 4 closed
Building certifications0No match
Business licenses50 active
Appeals0No match
PermitsPermit number, issued date, work and City status2
ElectricalPermit 50692
Jan 25, 2007 COMPLETED Completed Aug 6, 2007
TOTAL REWIRE 3 STORY 3 APARTMENT BUILDING AS PER 2005 NEC, 150AMP PER APT., AND 200AMP HOUSE LOAD, 400AMP MAIN, INSTALL WIRING AND EQUIPMENT FOR 3 ELECTRIC HOT WATER HEATERS, ALL NEW FIXTURES AND DEVICES
AlterationPermit 336758
Apr 20, 2011 EXPIRED
EXTERIOR ALTERATIONS TO DOORS AND WINDOWS PER SUBMITTED PLAN AND HISTORICAL COMMISSION APPROVAL.
Violation cases12 individual violation records; resolved history remains visible4
Case 209154CLOSED
CONSTRUCTION SERVICES · Opened Aug 4, 2009 · completed Jun 15, 2016
- HIST DIST-WINDOWS, DOORS ETCViolation 1549075Jul 31, 2009 COMPLIED
- DA-HIST DIST-INAPPROP FACADESViolation 1549074Jul 31, 2009 COMPLIED
- PERMB- ALTER REP'R EXT PORTIONViolation 1549076Jul 31, 2009 COMPLIED
Case 223284CLOSED
CONSTRUCTION SERVICES · Opened Dec 24, 2009 · completed Oct 14, 2015
- BLDG PERMIT REQUIREDViolation 3699660Sep 2, 2015 COMPLIED
- DA-HIST DIST-INAPPROP FACADESViolation 3699661Sep 2, 2015 COMPLIED
- HIST DIST-WINDOWS, DOORS ETCViolation 3699663Sep 2, 2015 COMPLIED
Case 234883CLOSED
CONSTRUCTION SERVICES · Opened May 12, 2010 · completed Apr 12, 2012
- PERMB- ALTER REP'R EXT PORTIONViolation 1954107May 7, 2010 COMPLIED
- HIST DIST-WINDOWS, DOORS ETCViolation 1954106May 7, 2010 COMPLIED
- DA-HIST DIST-INAPPROP FACADESViolation 1954105May 7, 2010 COMPLIED
Case 323166CLOSED
CONSTRUCTION SERVICES · Opened Apr 12, 2012 · completed Oct 14, 2015
- DA-HIST DIST-INAPPROP FACADESViolation 3699677Sep 2, 2015 COMPLIED
- BLDG PERMIT REQUIREDViolation 3699676Sep 2, 2015 COMPLIED
- HIST DIST-WINDOWS, DOORS ETCViolation 3699678Sep 2, 2015 COMPLIED
InvestigationsEvery inspector visit, including CLOSED outcomes15
L_INITIALCase 1824
Aug 16, 2002 CLOSED
BP_BLDGCase 209154
Jul 31, 2009 FAILED
BP_BLDGCase 209154
Sep 4, 2009 FAILED
BP_BLDGCase 209154
Oct 9, 2009 CLOSED
PRECOURTCase 209154
Dec 11, 2009 FAILED
PRECOURTCase 209154
Dec 24, 2009 CLOSED
BP_BLDGCase 234883
May 7, 2010 FAILED
BP_BLDGCase 234883
Dec 15, 2010 FAILED
BP_BLDGCase 234883
Jan 19, 2011 CLOSED
PRECOURTCase 234883
May 18, 2011 PASSED
PRECOURTCase 234883
Oct 31, 2011 PASSED
BP_BLDGCase 223284
Sep 2, 2015 FAILED
BP_BLDGCase 323166
Sep 2, 2015 FAILED
BP_BLDGCase 323166
Oct 14, 2015 PASSED
BP_BLDGCase 223284
Oct 14, 2015 PASSED
Building certificationsInspection result and filed expiration date by L&I building ID0
No building certifications matched this parcel in the fetched City dataset.
Business licensesHistorical and active licenses are both retained5
Vacant Residential Property / LotLicense 277883
LYNN STROMAN
Revenue code 3219 · First issued Jun 30, 2004 Inactive Expiration Feb 28, 2005 Inactive Dec 22, 2012
Vacant Residential Property / LotLicense 390218
FOCUS ONE
Revenue code 3219 · First issued Nov 3, 2006 Inactive Expiration Feb 28, 2007 Inactive Dec 22, 2012
RentalLicense 428574
ALPHONZO R MEBANE (ANTHONY LLOYD AGT)
Revenue code 3202 · First issued Nov 9, 2007 Inactive Expiration Feb 28, 2010 Inactive Dec 22, 2012
RentalLicense 508805
1834 W DIAMOND ST LLC
Revenue code 3202 · First issued Jul 15, 2010 Inactive Expiration Feb 28, 2018 Inactive Apr 29, 2018
RentalLicense 794979
Robert Blumenthal
Revenue code 3202 · First issued Nov 20, 2018 Inactive Expiration Nov 19, 2025 Inactive Jan 18, 2026
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.
2 resolve before relying
4 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 ↗Resolve before relyingA permit row needs file-level verification1 permit not marked completed: 336758 (EXPIRED).
Why it mattersIssued work is not the same as approved final work. L&I uses final inspections and required certifications to close construction permits; expired, withdrawn, and completed are different City statuses.
Verify nextOpen the permit file and confirm final inspections, holds, and any resulting occupancy certificate.
Open the controlling City guidance ↗VerifyResidential form does not establish rental useOPA classifies the parcel as multi-family; no active Rental License row matched.
Why it mattersA multi-unit or mixed-use classification does not prove that space is currently rented. If dwelling space is rented, Philadelphia generally requires a current Rental License and related occupancy, tax, violation, and lead compliance.
Verify nextConfirm actual occupancy first; if any unit is rented, verify the license and legal unit count with L&I.
Open the controlling City guidance ↗VerifyFailed inspections are dated events—not the current condition7 failed, 4 passed, and 4 CLOSED investigation outcomes are in the fetched history; the latest dated visit was PASSED on Oct 14, 2015.
Why it mattersA PASSED or FAILED value applies to that inspection visit. CLOSED is a separate source status; none of the three alone proves the parent permit or violation case closed—or describes today’s condition.
Verify nextOpen the parent case/permit for each material failure and confirm its later disposition.
Open the controlling City guidance ↗VerifyA historical business license is not current operating authorityVacant Residential Property / Lot #277883: Inactive since Dec 22, 2012; Vacant Residential Property / Lot #390218: Inactive since Dec 22, 2012
Why it mattersA license record proves the licensed activity existed at that time. An inactive or expired license does not establish that the business still operates—or that it may legally reopen under the same use.
Verify nextIf business income matters, verify the current tenant, use registration, and active license in eCLIPSE.
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 recordNo open violation; closed history remains relevantThe fetched record shows 0 open and 12 historical violations across 4 cases.
Why it mattersA closed case is materially better than an open one, but it does not by itself prove that every altered use, unit, or concealed condition matches today’s approvals.
Verify nextUse the closed cases to target the inspection and occupancy-file review.
Open the controlling City guidance ↗Closing file: checks no public-record summary can replace5 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 ↗Seller-specific tax relief is not the buyer’s bill
LOOP and low-income or senior Real Estate Tax freezes depend on the qualifying owner and continued program eligibility; a buyer cannot assume the seller’s capped or frozen bill continues. A separately verified property abatement often remains with the property for its remaining term, but program-specific new-owner filing, use, and tax-compliance conditions still must be confirmed—not inferred from the reduced assessment alone.
Next: Have Revenue or OPA identify every current benefit, model the buyer’s bill without seller-specific relief, and confirm any verified abatement in writing.
Official guidance ↗Separate water-lien guidance ↗Seller disclosure and independent inspections
For a covered Pennsylvania residential transfer, obtain the statutory seller disclosure. It reports the seller’s knowledge; it is not a warranty, title search, code review, or substitute for inspections. Because OPA dates this building before 1978, separately obtain the required federal/City lead disclosures and any test results.
Next: Have the agreement and disclosure reviewed for this transaction’s coverage and exceptions.
Official 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.
What to do with this
The record, translated into moves — what a buyer, the owner, and a landlord would each want to check next under Philadelphia's actual rules.
If you’re buying
Built 1915: lead rules apply
Federal law requires a lead-paint disclosure at sale for any pre-1978 home. If it will be rented, Philadelphia also requires a lead-safe or lead-free certificate before a rental license can issue.
If you’re the landlord
If it is rented, verify the Rental License
The fetched license records do not show an active Rental License. Ownership type or a tax mailing address does not prove that tenants occupy the property; if it is rented, verify the current license and legal occupancy in eCLIPSE.
Derived from the fetched property records and linked City guidance as of 2026. Assessment treatment is not a substitute for an exemption approval, live balance, title report, license, occupancy certificate, or inspection. Informational only — not legal, tax, or investment advice.
The investment read
How this building has moved and where it's pointed: the city's assessed value (not a listing price) over 12 years, charted against its block; appreciation is that history's pace, and the 5-year figure simply extends it. Yield estimates rent-vs-price from area rents. Ask the record to dig into any number.
Assessed value
$413,600
2026 billed-year assessment · 2027: $431,700 · built 1915
Price / sq ft
$176
block $128 · above block
Appreciation
+24%
+2%/yr, city 6.5%
In 5 years (~2031)
~$432K
+2%/yr own pace held 5 yrs — extrapolation, not a forecast
Est. tax bill / yr
$5,790
1.34% effective
Jun 2022 tax snapshot
No match
not proof the account is current
Gross yield
—
Times sold
3
Value vs. the block, over time — sales, permits & L&I events marked on the line
This houseBlock median & rangeSalePermit
The paper trail
Renovated & sold onBought for $77K in 2005, electrical permit in 2007, sold for $380K in 2017 (+394%).
- 2005 $77KSold
- 2007 ElectricalPermit
- 2009 3 L&I violationsL&IInspection failed ×3L&I visit
- 2010 $273KSold3 L&I violationsL&IInspection failed ×2L&I visit
- 2011 AlterationPermitInspection passed ×2L&I visit
- 2015 6 L&I violationsL&IL&I: 2 failed, 2 passedL&I visit
- 2017 $380KSold
Informational only — not investment advice or a consumer report (FCRA).
The property, on paper
The city assessor's field record — the physical spec sheet behind the assessed number.
Bedrooms
7
Bathrooms
4
Stories
3
Interior
2,457 sqft
livable area
Lot
2,058 sqft
Basement
Full, finished
city code A
Heat
Hot water / radiators
city code B
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
RM1
city zoning code
OPA field-assessment attributes. Condition and grade are the assessor's codes, not an inspection.
Run the numbers
What owning 1834 Diamond St takes, at your price and your rate. Taxes start with an annual estimate from the City’s taxable assessment, not a current bill or balance; rent starts at the area median. Assessed value is not an asking price — set the price slider to the real one.
When this house last sold (2017) a 30-year mortgage ran about 3.99% — Freddie Mac's average that year.
Mortgage
—
P&I · 30-yr fixed
All-in monthly
—
+ taxes & insurance
Cash to close
—
down + ~4% costs
Cash flow
—
rent − all costs · /mo
Cap rate
—
NOI ÷ price
Cash-on-cash
—
year-1 return on cash in
Estimates for orientation, not advice. Assumes a 30-year fixed loan, $1,400/yr insurance, 1% of price/yr maintenance; taxes use this parcel's taxable assessment, not a live Tax Center balance.
Block context
1834 Diamond St sits on the 1800 block of Diamond St. Open the block report to compare its parcels, ownership and public-record history.
See the whole block →Next door: 1832 Diamond St · 1836 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, 1:41 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)