309 KOSCIUSZKO ST, Brooklyn, NY 11221 — Property Records, Permits, Violations, Tax & Zoning | RegWatch

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Year Built1931

Floors4

Units43

Building Area30,193 sqft

ZoningR6B

ClassRM

Market Value$4.5M

309 KOSCIUSZKO ST is a property located at 309 KOSCIUSZKO ST, Brooklyn, NY 11221. It is classified as a condo - multi-dwelling. The building was constructed in 1931. It has 4 floors and 43 units. The building area is 30,193 square feet on a 10,000 sqft lot. The property is zoned R6B. The assessed market value is $4.5M. It last sold for $1.4M on Mar 4, 2010. There are 24 building permits on record (15 active). There are 15 violations on record (0 currently open). 7 docketed judgments carrying $2,100 in open balances are on record with OATH. Data sourced from NYC Department of Buildings (DOB), Housing Preservation & Development (HPD), Department of Finance (DOF), and other government agencies.

A RegWatch Dossier

156records on file

91Energy Star

Completed in 1931, 309 Kosciuszko St rises 4 stories over Kings. Public records put it at 43 units and 30,193 square feet of floor area, on land zoned R6B. It is carried on the public rolls at a market value of $4.5M, and assessed for tax at $2.0M. In the 43 years its record reaches back, the lot has drawn 156 separate government filings.

The documentary life of the address leans hard toward enforcement: 36 of its 156 records, fully 23%, fall under that one heading. Inspection (33) and permit (24) trail well behind. No violations stand open against it today.

The pace is anything but even. The early decades pass in near silence; the filings cluster heavily in recent years, peaking in 2014.

On the environmental ledger, the building posts an Energy Star score of 91, with a site energy-use intensity of 33.5 kBtu per square foot. Its operations answer for roughly 102 metric tons of CO2-equivalent a year.

Read together — 23% enforcement, 43 years of accumulation, a parcel of Kings — these scattered records compose a portrait of the address that no single page sets out to draw.

$4.5M of Kings, written across 156 government filings.

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Sources

NYC DOB NYC HPD NYC DOF ACRIS NYC DCP ECB/OATH NYC DEP NYC LPC NYC FDNY NYS DHCR MOCEJ FEMA EPA US Census HUD USGS

updated Aug 1, 2026

Property Details

Address309 KOSCIUSZKO ST, Brooklyn, NY 11221

Building TypeCondo - Multi-Dwelling

Building ClassRM

Year Built1931

Floors4

Total Units43

Building Area30,193 sqft

Lot Size10,000 sqft

ZoningR6B

ConditionAverage

BBL3017821001

BIN3049689

Assessment & Sales

Market Value$4.5M

Assessed Total$2M

Assessed Land$375K

Last Sale Price$1.4M

Last Sale DateMar 4, 2010

Building Permits

24 on record · 15 active

General ConstructionDOB Legacy

COMPLETED

Filed Dec 11, 2014Job #321042894-01

View this permit's full record & inspection history →

Alteration — Type 1DOB Legacy

SIGNED OFF

Filed Dec 8, 2014Est. cost $2.7MJob #320283652-01

GEN. CONSTR

View this permit's full record & inspection history →

Alteration — Type 1DOB Legacy

SIGNED OFF

Filed Dec 8, 2014Job #320283652-03

STRUCTURAL

View this permit's full record & inspection history →

Alteration — Type 1DOB Legacy

SIGNED OFF

Filed Dec 8, 2014Job #320283652-02

GENERAL

View this permit's full record & inspection history →

Alteration — Type 3DOB Legacy

SIGNED OFF

Filed Dec 8, 2014Job #320699847-01

View this permit's full record & inspection history →

+ 19 more permits — view full report

Violations

15 on record · none currently open

Open judgment balance — docketed OATH judgments$2,100

Judgments · 7 docketed

Sanitation summons (OATH)JUDGMENT DOCKETED

Docketed Oct 31, 2021Balance $300Ticket #047183033Y

LOOSE RUBBISH

Sanitation summons (OATH)JUDGMENT DOCKETED

Docketed Jul 31, 2021Balance $300Ticket #046927733H

LOOSE RUBBISH

Sanitation summons (OATH)JUDGMENT DOCKETED

Docketed Nov 30, 2020Balance $300Ticket #0211074041

IMPROPER DISPOSAL BEDDING 1ST OFFENSE

Sanitation summons (OATH)JUDGMENT DOCKETED

Docketed Apr 30, 2020Balance $300Ticket #0210103401

DIRTY SIDEWALK DIRTY AREA

Sanitation summons (OATH)JUDGMENT DOCKETED

Docketed Mar 31, 2016Ticket #041976563N

LOOSE RUBBISH

+ 2 more docketed judgments — view full report

DOB LegacyE

RESOLVED

Issued Sep 14, 2020#2485225

View this violation's full details & status history →

DOB LegacyE

RESOLVED

Issued Jul 26, 2017#2192954

View this violation's full details & status history →

HPDClass I

VIOLATION DISMISSED

Issued Nov 15, 2016#11510880

§27-2107 ADM CODE OWNER FAILED TO FILE A VALID REGISTRATION STATEMENT WITH THE DEPARTMENT AS REQUIRED BY ADM CODE §27-2097 AND IS THEREFORE SUBJECT TO CIVIL PENALTIES, PROHIBITED FROM CERTIFYING VIOLATIONS, AND DENIED THE RIGHT TO RECOVER POSSESSION OF PREMISES FOR NONPAYMENT OF RENT UNTIL A VALID REGISTRATION STATEMENT IS FILED.

View this violation's full details & status history →

HPDClass I

VIOLATION DISMISSED

Issued Feb 25, 2015#10587258

§27-2107 ADM CODE OWNER FAILED TO FILE A VALID REGISTRATION STATEMENT WITH THE DEPARTMENT AS REQUIRED BY ADM CODE §27-2097 AND IS THEREFORE SUBJECT TO CIVIL PENALTIES, PROHIBITED FROM CERTIFYING VIOLATIONS, AND DENIED THE RIGHT TO RECOVER POSSESSION OF PREMISES FOR NONPAYMENT OF RENT UNTIL A VALID REGISTRATION STATEMENT IS FILED.

View this violation's full details & status history →

DOB LegacyElevator

DISMISSED

Issued Oct 31, 2014#1919384

VIOLATION ISSUED TO ELEVATOR-FAILURE TO FILE CATEGORY 1 2013 INSPECTION/TEST

View this violation's full details & status history →

+ 10 more violations on record — view full report

Get the Complete Report for 309 KOSCIUSZKO ST

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Frequently Asked Questions

When was 309 KOSCIUSZKO ST, Brooklyn built?

The building at 309 KOSCIUSZKO ST, Brooklyn, NY 11221 was constructed in 1931. It is classified as a condo - multi-dwelling with 4 floors and 43 units. The building area is 30,193 sqft.

Are there building permits at 309 KOSCIUSZKO ST, Brooklyn?

Yes. 309 KOSCIUSZKO ST, Brooklyn, NY 11221 has 24 building permits on record, with 15 currently active. Permits are sourced from the NYC Department of Buildings (DOB Legacy and DOB NOW systems). The most recent permit is a General Construction (COMPLETED) filed Dec 11, 2014.

Does 309 KOSCIUSZKO ST, Brooklyn have violations?

Yes. 309 KOSCIUSZKO ST, Brooklyn, NY 11221 has 15 violations on record, with 0 currently open. Breakdown: 6 DOB, 7 ECB, 2 HPD. Sources: NYC DOB, HPD, and ECB/OATH.

Does 309 KOSCIUSZKO ST, Brooklyn have docketed judgments?

Yes. 309 KOSCIUSZKO ST, Brooklyn, NY 11221 has 7 docketed judgments on record with the NYC Office of Administrative Trials & Hearings (OATH), with an open balance of $2,100. A docketed judgment is an enforceable money judgment entered by OATH after a hearing on a summons issued at this property; where the respondent is the property owner it can attach to the property as a lien.

What is the property tax assessment for 309 KOSCIUSZKO ST?

309 KOSCIUSZKO ST, Brooklyn, NY 11221 has an assessed market value of $4.5M and a total assessed value of $2M (land: $375K). Assessment data is from the NYC Department of Finance (DOF).

When was 309 KOSCIUSZKO ST last sold?

309 KOSCIUSZKO ST, Brooklyn, NY 11221 last sold for $1.4M on Mar 4, 2010. Sale records are sourced from NYC ACRIS and Department of Finance rolling sales data.

What is the zoning for 309 KOSCIUSZKO ST?

309 KOSCIUSZKO ST, Brooklyn, NY 11221 is zoned R6B. Zoning data is from the NYC Department of City Planning (DCP). For detailed FAR, overlays, and development rights, view the full property report on RegWatch.

How do I get a full property report for 309 KOSCIUSZKO ST?

Search 309 KOSCIUSZKO ST on RegWatch to see its public record free — violations, permits, tax records, zoning, environmental data, and more from 250+ government sources, no credit card required. A Full Analysis report adds the complete title history, owner contacts, and a downloadable PDF.

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309 KOSCIUSZKO ST, Brooklyn, NY 11221 — Property Records, Permits, Violations, Tax & Zoning | RegWatch