2026 taxable assessment $299,200 × 1.3998%. Estimate—not a bill or account balance.
OPA also publishes a 2027 assessment of $397,200; it is not the 2026 billed-year value.
Multi-family report
521 Diamond St
6 bd · 3 ba · 3 stories · 2,064 sqft · RM1 · built 1915
Investor / LLC · assessed $299K (2026) · 2027 OPA assessment $397K · sold 1×. On the 500 block of Diamond St.
Property summary
Assessment$299,2002026 OPA assessment · 2027: $397,200
Last sale$48KRecorded 2018
Est. tax bill$4,188/year2026 taxable assessment × 1.3998%
Tax delinquency$13KCity snapshot · Jun 2022
Permits0Dated events in report
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
Ask the questions this record raises.
Every choice opens the research chat with this property already in context. Curated questions are free.
Question or correct this record
BlockReport can explain a discrepancy, but it cannot rewrite an official City record. Use the agency that owns the underlying fact:
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 1913851002026 taxable assessment equals the full assessed value.
Historical delinquency sources Record found
$12,800.74 was recorded for this parcel in Philadelphia's June 2022 delinquency snapshot. That amount may have been paid, reduced, or increased since; it is not a current payoff figure.
A separate historical parcel ledger ending in 2016 records $4,456.48 and a lien entry. It is shown as historical context only.
2015$2,094.37 total · $1,438.29 principal · $152.81 interest · $100.67 penalty2016$2,362.11 total · $2,089.48 principal · $31.34 interest · $20.89 penalty
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 recordHistory
Why it matters17 L&I violations (2017); Inspection failed ×4 (2017); sold $48K (2018).
View supporting records →Records to verify together
Rule-based groupings across this property's dated public records. Each flag shows the records that belong in the same verification step and where the inference stops.
Records to verify together
More than one separately dated public record deserves a current-status check.
Evidence: $12,801 appeared in the City's June 2022 delinquency snapshot · a lien number appears in the historical tax ledger through 2016
Limit: A screening signal, not a foreclosure prediction. Tax entries are historical and must be verified with Philadelphia Revenue.
Assessment/permit mismatch
The assessment jumped 33% in 2027, but no matching permit appears in the property timeline.
Evidence: assessment moved from $299,200 to $397,200 · no permit shown in 2026-2028
Limit: Not proof of unpermitted work; reassessment, corrected data, or a permit under another parcel can also explain it.
Transparent record rules, not a score or forecast. Each flag is a prompt to verify the cited records, not a prediction or allegation.
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 own it
$4,456 in the historical tax ledger through 2016
Historical context only, not a current payoff figure; that ledger also contains a lien entry. Verify today's balance and lien status directly with Philadelphia Revenue before relying on it.
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.
Who's behind it
Lmb Real Estate LLC · corporate / LLC owner
• Tax bills mail to 518 S 3rd St, Philadelphia PA, 19147
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
$299,200
2026 billed-year assessment · 2027: $397,200 · built 1915
Price / sq ft
$192
block $116 · above block
Appreciation
+206%
+11%/yr, city 6.5%
In 5 years (~2031)
~$399K
+11%/yr own pace held 5 yrs — extrapolation, not a forecast
Est. tax bill / yr
$4,188
1.05% effective
Jun 2022 tax snapshot
$13K
recorded then · verify current
Gross yield
2.1%
≈$705/mo rent
Times sold
1
Value vs. the block, over time — sales, permits & L&I events marked on the line
This houseBlock median & rangeSaleL&I violation
Highlight
The paper trail
History17 L&I violations (2017); Inspection failed ×4 (2017); sold $48K (2018).
- 2017 17 L&I violationsL&IInspection failed ×4L&I visit
- 2018 $48KSold
City record timeline
Every dated deed, permit, inspection, license, violation, certification, and appeal—together.
The timeline combines the report’s transfer history with every successfully fetched L&I and zoning row. A date or status is the City’s filed record, not a statement that the condition remains current; use the official file for live detail.
- Recorded owner
- Lmb Real Estate LLC
- L&I district
- —
- OPA account
- 191385100
What this record suggests
The dated deed and City-record sequence is assembled below. Read timing as a research lead, not proof of renovation, condition, or motive.
- Recorded transfer$48K transfer
2018
Free record guide
How Philadelphia’s property system works
These explainers are free because the record only helps if you know what it can—and cannot—prove. Use the linked City guidance for the controlling rule.
Permits and inspections
A permit is the City’s authorization and review pathway for construction or repair work. No fetched permit is not proof that no work ever happened.
L&I inspections are scheduled at defined stages; final inspection and required certifications are separate steps in closing out applicable work.
How construction and repair permits work ↗See City inspection stages by permit type ↗Assessments and taxes
The OPA assessment is the City’s value on the tax roll—not an asking price, appraisal, or live account balance. The taxable assessment can differ from the full assessment because the City roll records exemptions or other treatment; the report keeps those fields separate.
Your annual estimate uses the taxable assessment. Payments, credits, interest, and the amount due are maintained separately in Tax Center.
How the Office of Property Assessment works ↗Philadelphia property-tax guidance ↗Violations, cases, and status
L&I enforcement records can include warnings, notices, orders, inspections, and later resolution activity. A closed visit is still a historical record; it is not a missing event.
How L&I code enforcement works ↗City violation and order types ↗Flags: $13K recorded in the June 2022 delinquency snapshot — verify current balance · historical tax ledger through 2016 recorded $4K with a lien entry. 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
6
Bathrooms
3
Stories
3
Interior
2,064 sqft
livable area
Lot
1,008 sqft
Basement
Full
city code D
Heat
Undetermined
city code H
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 521 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 (2018) a 30-year mortgage ran about 4.54% — 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
521 Diamond St sits on the 500 block of Diamond St. Open the block report to compare its parcels, ownership and public-record history.
See the whole block →Next door: 519 Diamond St · 523 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 9, 2026, 5:52 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. “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)