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Brooklyn • Hospital

451 Clarkson Ave

Brooklyn, NY 11203Company-ownedBBL 3048290001BIN 3397939
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16 sources

Year Built1930
Floors5
Units1
Building Area1,503,150 sqft
ZoningR5
ClassI1
Market Value$323.7M

451 CLARKSON AVE is a property located at 451 CLARKSON AVE, Brooklyn, NY 11203. It is classified as a hospital - general. The building was constructed in 1930. It has 5 floors and 1 unit. The building area is 1,503,150 square feet on a 891,577 sqft lot. The property is zoned R5. The assessed market value is $323.7M. Public records list the property as company-owned. There are 1774 building permits on record (1311 active). There are 1602 violations on record (314 currently open). 78 docketed judgments carrying $63,760 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

5,150records on file
93Energy Star

Completed in 1930, 451 Clarkson Ave rises 5 stories over Kings. Public records put it at 1 unit and 1,503,150 square feet of floor area, on land zoned R5. It is carried on the public rolls at a market value of $324M, and assessed for tax at $146M. In the 66 years its record reaches back, the lot has drawn 5,150 separate government filings — a paper trail nearly as tall as the building itself.

The documentary life of the address leans hard toward permit: 1,774 of its 5,150 records, fully 34%, fall under that one heading. Violation (1,602) and enforcement (1,057) trail well behind. 314 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 2023.

On the environmental ledger, the building posts an Energy Star score of 93, with a site energy-use intensity of 298.2 kBtu per square foot. Its operations answer for roughly 45,282 metric tons of CO2-equivalent a year.

Read together — 34% permit, 66 years of accumulation, a parcel of Kings — these scattered records compose a portrait of the address that no single page sets out to draw.

$324M of Kings, written across 5,150 government filings.

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Executive summary, compliance history, title chain & existing debt, recorded documents & agreements, owner contacts, tax detail, Use & Development, build envelope, market comps, investment metrics, deal math & stress tests, deal signals, pre-foreclosure signals, neighborhood. Downloadable PDF. One payment, no subscription.

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

Property Details

Address451 CLARKSON AVE, Brooklyn, NY 11203
Building TypeHospital - General
I1
Year Built1930
Floors5
Total Units1
Building Area1,503,150 sqft
Lot Size891,577 sqft
ZoningR5
3048290001
3397939 +14 more
OwnershipCompany-owned

Assessment & Sales

$323.7M
$145.7M
$12.6M

Building Permits

1774 on record · 1311 active
Cats RegistrationOther
CURRENT
Filed Oct 27, 2026Job #506983
View this permit's full record & inspection history →
General ConstructionDOB NOW
PLAN EXAMINER REVIEW
Filed Oct 26, 2026Est. cost $9MJob #B01447250-I1
View this permit's full record & inspection history →
General ConstructionDOB NOW
PLAN EXAMINER REVIEW
Filed Oct 23, 2026Job #B01447250-S4
View this permit's full record & inspection history →
General ConstructionDOB NOW
OBJECTIONS
Filed Oct 20, 2026Est. cost $80KJob #B00621060-S1
View this permit's full record & inspection history →
General ConstructionDOB NOW
PLAN EXAMINER REVIEW
Filed Oct 16, 2026Est. cost $57KJob #B00776157-P1
View this permit's full record & inspection history →

+ 1769 more permits — view full report

Violations

1602 on record · 314 open
Open judgment balance — docketed OATH judgments$63,760
Judgments · 78 docketed
FDNY summons (OATH)JUDGMENT DOCKETED
Docketed Feb 28, 2026Balance $1,000Ticket #014208101H
FIRE PROTECTION SYSTEMS
Sanitation summons (OATH)JUDGMENT DOCKETED
Docketed Dec 31, 2025Balance $370Ticket #049116571Y
FAIL TO CLEAN 18 INCH INTO STREET COMM MAN INDUSTRIAL MIXED USE 1ST
FDNY summons (OATH)JUDGMENT DOCKETED
Docketed Oct 31, 2025Balance $1,000Ticket #014189432L
AFFIDAVITS, DESIGN INSTALLATION DOCUMENTS, AND OTHER DOCUMENTATION
FDNY summons (OATH)JUDGMENT DOCKETED
Docketed Sep 30, 2025Balance $1,000Ticket #014182294K
CERTIFICATES OF FITNESS AND CERTIFICATES OF QUALIFICATION
FDNY summons (OATH)JUDGMENT DOCKETED
Docketed Oct 31, 2024Balance $50Ticket #014120960J
LABELS MARKINGS

+ 73 more docketed judgments — view full report

SafetyElevator
ACTIVE
Issued Oct 2, 2026#VIO-FTF-VT-CAT1-202512-0003153

Violation Issued-Failure To File 2025 Cat1 Test Report

View this violation's full details & status history →
SafetyElevator
ACTIVE
Issued Oct 2, 2026#VIO-FTF-VT-CAT1-202512-0000592

Violation Issued-Failure To File 2025 Cat1 Test Report

View this violation's full details & status history →
SafetyElevator
ACTIVE
Issued Oct 2, 2026#VIO-FTF-VT-PER-202512-0000795

Violation Issued-Failure To File 2025 Periodic Inspection Report

View this violation's full details & status history →
SafetyElevator
ACTIVE
Issued Oct 2, 2026#VIO-FTF-VT-PER-202512-0003698

Violation Issued-Failure To File 2025 Periodic Inspection Report

View this violation's full details & status history →
SafetyElevator
ACTIVE
Issued Oct 2, 2026#VIO-FTF-VT-CAT1-202512-0000593

Violation Issued-Failure To File 2025 Cat1 Test Report

View this violation's full details & status history →

+ 1597 more violations on record — view full report

Get the Complete Report for 451 CLARKSON AVE

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

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Frequently Asked Questions

When was 451 CLARKSON AVE, Brooklyn built?

The building at 451 CLARKSON AVE, Brooklyn, NY 11203 was constructed in 1930. It is classified as a hospital - general with 5 floors and 1 unit. The building area is 1,503,150 sqft.

Are there building permits at 451 CLARKSON AVE, Brooklyn?

Yes. 451 CLARKSON AVE, Brooklyn, NY 11203 has 1774 building permits on record, with 1311 currently active. Permits are sourced from the NYC Department of Buildings (DOB Legacy and DOB NOW systems). The most recent permit is a Cats Registration (CURRENT) filed Oct 27, 2026.

Does 451 CLARKSON AVE, Brooklyn have violations?

Yes. 451 CLARKSON AVE, Brooklyn, NY 11203 has 1602 violations on record, with 314 currently open. Breakdown: 318 DOB Safety, 950 DOB, 334 ECB. Sources: NYC DOB, HPD, and ECB/OATH.

Does 451 CLARKSON AVE, Brooklyn have docketed judgments?

Yes. 451 CLARKSON AVE, Brooklyn, NY 11203 has 78 docketed judgments on record with the NYC Office of Administrative Trials & Hearings (OATH), with an open balance of $63,760. 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 451 CLARKSON AVE?

451 CLARKSON AVE, Brooklyn, NY 11203 has an assessed market value of $323.7M and a total assessed value of $145.7M (land: $12.6M). Assessment data is from the NYC Department of Finance (DOF).

What is the zoning for 451 CLARKSON AVE?

451 CLARKSON AVE, Brooklyn, NY 11203 is zoned R5. 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.

Who owns 451 CLARKSON AVE?

451 CLARKSON AVE, Brooklyn, NY 11203 is company-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 451 CLARKSON AVE?

Search 451 CLARKSON AVE 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 ($15, one-time) adds the complete title history, owner contacts, and a downloadable PDF.

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451 CLARKSON AVE, Brooklyn, NY 11203 — Property Records, Permits, Violations, Tax & Zoning | RegWatch