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Brooklyn

421 Adelphi St

Brooklyn, NY 11238Individually ownedBBL 3019581107BIN 3329555
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Updated Aug 1, 2026 · 16 sources

Floors4
ClassR2
Market Value$279K

421 ADELPHI ST is a property located at 421 ADELPHI ST, Brooklyn, NY 11238. The building has 4 floors. The assessed market value is $279K. It last sold for $900K on Aug 1, 2022. Public records list the property as individually owned. There are 5 building permits on record (3 active). There are 66 violations on record (57 currently open). 14 docketed judgments carrying $11,000 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

249records on file
100Energy Star

The lot at 421 Adelphi St rises 4 stories over Kings. It is carried on the public rolls at a market value of $279K, and assessed for tax at $125K. In the 37 years its record reaches back, the lot has drawn 249 separate government filings.

The documentary life of the address leans hard toward violation: 66 of its 249 records, fully 27%, fall under that one heading. Complaint (36) and release (29) trail well behind. 57 violations stand open against it today.

The pace is anything but even. Activity is spread across the decades, with 1989 the busiest year on file.

On the environmental ledger, the building posts an Energy Star score of 100, with a site energy-use intensity of 20.4 kBtu per square foot. Its operations answer for roughly 154 metric tons of CO2-equivalent a year.

Read together — 27% violation, 37 years of accumulation, a parcel of Kings — these scattered records compose a portrait of the address that no single page sets out to draw.

$279K of Kings, written across 249 government filings.

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Sources
NYC DOBNYC HPDNYC DOFACRISNYC DCPECB/OATHNYC DEPNYC LPCNYC FDNYNYS DHCRMOCEJFEMAEPAUS CensusHUDUSGS
updated

Property Details

Address421 ADELPHI ST, Brooklyn, NY 11238
R2
Year BuiltN/A
Floors4
Total UnitsN/A
Building AreaN/A
Lot SizeN/A
3019581107
3329555
OwnershipIndividually owned

Assessment & Sales

$279K
$125K
$10K
$900K
Last Sale DateAug 1, 2022

Building Permits

5 on record · 3 active
ElectricalDOB NOW
COMPLETE
Filed Apr 24, 2025Job #B01215974-I1-EL

Replacing outlets and swicthes.

View this permit's full record & inspection history →
AlterationDOB Legacy
ISSUED
Filed Oct 11, 2013Job #320878430-01-01

OT

View this permit's full record & inspection history →
Alteration — Type 3DOB Legacy
PERMIT ISSUED - ENTIRE JOB/WORK
Filed Oct 11, 2013Est. cost $16KJob #320878430-01

GEN. CONSTR.

View this permit's full record & inspection history →
AlterationDOB Legacy
ISSUED
Filed Apr 2, 1993Job #300237214-01-01
View this permit's full record & inspection history →
Limited AlterationDOB NOW
SIGNED OFF
Filed N/AJob #B01229909-I1
View this permit's full record & inspection history →

Violations

66 on record · 57 open
Open judgment balance — docketed OATH judgments$11,000
Judgments · 14 docketed
Sanitation summons (OATH)JUDGMENT DOCKETED
Docketed Dec 31, 2025Ticket #049042284M
FAILURE TO CLEAN 18 INCHES INTO STREET
FDNY summons (OATH)JUDGMENT DOCKETED
Docketed Aug 31, 2025Balance $5,000Ticket #014179993M
INSPECTION AND TESTING
Sanitation summons (OATH)JUDGMENT DOCKETED
Docketed Aug 31, 2025Ticket #048908455X
LOOSE RUBBISH 1ST OCCURRENCE
FDNY summons (OATH)JUDGMENT DOCKETED
Docketed Dec 31, 2024Balance $5,000Ticket #014135878M
INSPECTION AND TESTING
FDNY summons (OATH)JUDGMENT DOCKETED
Docketed Jan 31, 2024Balance $1,000Ticket #014078659Y
INSPECTION AND TESTING

+ 9 more docketed judgments — view full report

HPDClass A
NOV SENT OUT
Issued May 1, 2026#18862799

(A) § HMC:FILE ANNUAL BEDBUG REPORT IN ACCORDANCE WITH HPD RULE AS DESCRIBED ON THE BACK OF THIS NOTICE OF VIOLATION OR AS DESCRIBED ON HPDS WEBSITE, WWW.NYC.GOV\HPD, SEARCH BED BUGS.

View this violation's full details & status history →
HPDClass A
NOV SENT OUT
Issued Apr 12, 2026#18782436

§ 26-1103 ADMIN. CODE: POST AND MAINTAIN A PROPER NOTICE ON WALL OF THE ENTRANCE STORY IN ENGLISH AND SPANISH ON THE AVAILABILITY OF THE AGENCYS HOUSING INFORMATION GUIDE. A SAMPLE NOTICE CAN BE FOUND AT WWW.NYC.GOV/HPD. AT PUBLIC HALL, 1st STORY

View this violation's full details & status history →
HPDClass A
NOV SENT OUT
Issued Apr 12, 2026#18782437

§ 27-2104 ADM CODE POST AND MAINTAIN A PROPER SIGN ON WALL OF ENTRANCE STORY SHOWING THE REGISTRATION NUMBER ASSIGNED BY THE DEPARTMENT AND THE ADDRESS OF THE BUILDING. AT PUBLIC HALL, 1st STORY

View this violation's full details & status history →
HPDClass I
INFO NOV SENT OUT
Issued Nov 20, 2025#18423341

§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 LegacyLBLVIO
ACTIVE
Issued Nov 14, 2025#2810433

VIOLATION ISSUED-FAILURE TO FILE 2024 EXTERNAL LOW PRESSURE INSPECTION

View this violation's full details & status history →

+ 61 more violations on record — view full report

Get the Complete Report for 421 ADELPHI ST

Title history, detailed tax records, environmental data, zoning analysis, and more from 250+ government sources.

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Frequently Asked Questions

Are there building permits at 421 ADELPHI ST, Brooklyn?

Yes. 421 ADELPHI ST, Brooklyn, NY 11238 has 5 building permits on record, with 3 currently active. Permits are sourced from the NYC Department of Buildings (DOB Legacy and DOB NOW systems). The most recent permit is a Electrical (COMPLETE) filed Apr 24, 2025.

Does 421 ADELPHI ST, Brooklyn have violations?

Yes. 421 ADELPHI ST, Brooklyn, NY 11238 has 66 violations on record, with 57 currently open. Breakdown: 30 DOB, 36 HPD. Sources: NYC DOB, HPD, and ECB/OATH.

Does 421 ADELPHI ST, Brooklyn have docketed judgments?

Yes. 421 ADELPHI ST, Brooklyn, NY 11238 has 14 docketed judgments on record with the NYC Office of Administrative Trials & Hearings (OATH), with an open balance of $11,000. 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 421 ADELPHI ST?

421 ADELPHI ST, Brooklyn, NY 11238 has an assessed market value of $279K and a total assessed value of $125K (land: $10K). Assessment data is from the NYC Department of Finance (DOF).

When was 421 ADELPHI ST last sold?

421 ADELPHI ST, Brooklyn, NY 11238 last sold for $900K on Aug 1, 2022. Sale records are sourced from NYC ACRIS and Department of Finance rolling sales data.

Who owns 421 ADELPHI ST?

421 ADELPHI ST, Brooklyn, NY 11238 is individually owned according to public records. Ownership data is from NYC Department of Finance assessment rolls. View the current owner of record and registered contacts in the full property report on RegWatch.

How do I get a full property report for 421 ADELPHI ST?

Search 421 ADELPHI 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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421 ADELPHI ST, Brooklyn, NY 11238 — Property Records, Permits, Violations, Tax & Zoning | RegWatch