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Manhattan • Elevator Apartment

503 West 121 St

Manhattan, NY 10027Company-ownedBBL 1019760026BIN 1059656
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Updated Aug 1, 2026 · 16 sources

Year Built1910
Floors6
Units30
Building Area30,498 sqft
ZoningR8
ClassD1
Market Value$5.7M

503 WEST 121 ST is a property located at 503 WEST 121 ST, Manhattan, NY 10027. It is classified as a elevator apartment - semi-fireproof. The building was constructed in 1910. It has 6 floors and 30 units. The building area is 30,498 square feet on a 7,194 sqft lot. The property is zoned R8. The assessed market value is $5.7M. Public records list the property as company-owned. There are 44 building permits on record (31 active). There are 37 violations on record (15 currently open). 11 docketed judgments 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

204records on file
16Energy Star

Completed in 1910, 503 West 121 St rises 6 stories over New York. Public records put it at 30 units and 30,498 square feet of floor area, on land zoned R8. It is carried on the public rolls at a market value of $5.7M, and assessed for tax at $2.6M. In the 46 years its record reaches back, the lot has drawn 204 separate government filings.

The documentary life of the address leans hard toward inspection: 50 of its 204 records, fully 25%, fall under that one heading. Permit (44) and violation (37) trail well behind. 15 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 2013.

On the environmental ledger, the building posts an Energy Star score of 16, with a site energy-use intensity of 186.4 kBtu per square foot. Its operations answer for roughly 338 metric tons of CO2-equivalent a year.

Read together — 25% inspection, 46 years of accumulation, a parcel of New York — these scattered records compose a portrait of the address that no single page sets out to draw.

$5.7M of New York, written across 204 government filings.

Open the live report — daily-updated data, AI chat & alerts
Sources
NYC DOBNYC HPDNYC DOFACRISNYC DCPECB/OATHNYC DEPNYC LPCNYC FDNYNYS DHCRMOCEJFEMAEPAUS CensusHUDUSGS
updated

Property Details

Address503 WEST 121 ST, Manhattan, NY 10027
Building TypeElevator Apartment - Semi-Fireproof
D1
Year Built1910
Floors6
Total Units30
Building Area30,498 sqft
Lot Size7,194 sqft
ZoningR8
ConditionAverage
1019760026
1059656
OwnershipCompany-owned

Assessment & Sales

$5.7M
$2.6M
$135K

Building Permits

44 on record · 31 active
General ConstructionDOB NOW
LOC ISSUED
Filed Feb 17, 2026Est. cost $1KJob #M01148771-I1
View this permit's full record & inspection history →
General ConstructionDOB NOW
PERMIT ISSUED
Filed Dec 5, 2025Est. cost $599KJob #M01117811-I1

Renewal Permit Without Changes

View this permit's full record & inspection history →
Suspended ScaffoldDOB NOW
PERMIT ISSUED
Filed Dec 5, 2025Job #M01143805-I1

Renewal Permit Without Changes

View this permit's full record & inspection history →
General ConstructionDOB NOW
PERMIT ENTIRE
Filed Dec 5, 2025Job #M01143805-I1
View this permit's full record & inspection history →
General ConstructionDOB NOW
PERMIT ENTIRE
Filed Dec 5, 2025Est. cost $599KJob #M01117811-I1
View this permit's full record & inspection history →

+ 39 more permits — view full report

Violations

37 on record · 15 open
Judgments · 11 docketed
DOB summons (OATH)JUDGMENT DOCKETED
Docketed Jun 30, 2023Ticket #037025162Y
FAIL SUBMIT REQUIRED REPORT OF CRIT EXAM DOCUMENTING EXTERIOR WALL
FDNY summons (OATH)JUDGMENT DOCKETED
Docketed Mar 31, 2017Ticket #011469587N
PORTABLE FIRE EXTINGUISHERS AND FIRE HOSES
DOB summons (OATH)JUDGMENT DOCKETED
Docketed Apr 30, 2017Ticket #032077374Z
FAIL MAINTAIN BLDG IN COMPLIANT MANNER: SERVICE EQUIPMENT - BOILER
DEP summons (OATH)JUDGMENT DOCKETED
Docketed Aug 31, 2017Ticket #0189363983
FAILED TO INSTALL A BACKFLOW PREVENTER
Sanitation summons (OATH)JUDGMENT DOCKETED
Docketed Jun 30, 2016Ticket #040209945P
NON-RECYCLABLES IN RECYC. CONTAINER FOR COLLECTION 9+ DWELLING UNITS

+ 6 more docketed judgments — view full report

ECBLocal Law
ACTIVE
Issued Dec 9, 2022#37025162Y

FAILURE TO SUBMIT AN ACCEPTABLE REQUIRED CYCLE 9A REPORT OF CRITICAL EXAMINATION DOCUMENTING CONDITION OF EXTERIOR WALL AND APPURTENANCES REQUIRED BY 28-302.4 FOR CONTROL#906798.REMEDY:SUBMIT ACCEPTABLE REQUIRE

View this violation's full details & status history →
DOB LegacyFacade Safety (FISP)
ACTIVE
Issued Feb 22, 2022#2580118

FAILED TO FILE FISP CYCLE 9A TECHNICAL REPORT BY 02/21/2022

View this violation's full details & status history →
DOB LegacyEnergy Benchmarking
ACTIVE
Issued Aug 2, 2019#2379146

FAILURE TO FILE BENCHMARKING REPORT OF ENERGY USE AS PER AD. CODE SEC. 28-309.4

View this violation's full details & status history →
DOB LegacyEnergy Benchmarking
ACTIVE
Issued May 2, 2019#2358987

FAILURE TO FILE BENCHMARKING REPORT OF ENERGY USE AS PER AD. CODE SEC. 28-309.4

View this violation's full details & status history →
ECBBoiler
ACTIVE
Issued Aug 29, 2016#32077374Z

B254, 36 FOUND 1 AO SMITH HW 670 BOILER NOT REGISTERED. REGISTER BOILER AND CORRECT ALL VIOLATING CONDITIONS AND SUBMIT CERTIFICATE OF CORRECTION.

View this violation's full details & status history →

+ 32 more violations on record — view full report

Get the Complete Report for 503 WEST 121 ST

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

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Frequently Asked Questions

When was 503 WEST 121 ST, Manhattan built?

The building at 503 WEST 121 ST, Manhattan, NY 10027 was constructed in 1910. It is classified as a elevator apartment - semi-fireproof with 6 floors and 30 units. The building area is 30,498 sqft.

Are there building permits at 503 WEST 121 ST, Manhattan?

Yes. 503 WEST 121 ST, Manhattan, NY 10027 has 44 building permits on record, with 31 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 (LOC ISSUED) filed Feb 17, 2026.

Does 503 WEST 121 ST, Manhattan have violations?

Yes. 503 WEST 121 ST, Manhattan, NY 10027 has 37 violations on record, with 15 currently open. Breakdown: 21 DOB, 7 ECB, 9 HPD. Sources: NYC DOB, HPD, and ECB/OATH.

Does 503 WEST 121 ST, Manhattan have docketed judgments?

Yes. 503 WEST 121 ST, Manhattan, NY 10027 has 11 docketed judgments on record with the NYC Office of Administrative Trials & Hearings (OATH). 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 503 WEST 121 ST?

503 WEST 121 ST, Manhattan, NY 10027 has an assessed market value of $5.7M and a total assessed value of $2.6M (land: $135K). Assessment data is from the NYC Department of Finance (DOF).

What is the zoning for 503 WEST 121 ST?

503 WEST 121 ST, Manhattan, NY 10027 is zoned R8. 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 503 WEST 121 ST?

503 WEST 121 ST, Manhattan, NY 10027 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 503 WEST 121 ST?

Search 503 WEST 121 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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503 WEST 121 ST, Manhattan, NY 10027 — Property Records, Permits, Violations, Tax & Zoning | RegWatch