Building record from city data · MANHATTAN, NY

503 W 121 St

Printed 2026-10-20 from blueflo.tech/b/503-west-121-street-manhattan, where it is kept current. These are city records, not an inspection by Blueflo. Every item shows its source and the date it was last checked. Not a warranty. May not be used for tenant screening (terms of use).

built 1910 · 6 stories · 3 apartments · BIN 1059656 · BBL 1019760026

Checked in city records
Checked in city records: non-lead water line, boiler filing with no defects (Aug 2026), facade filed as safe
Source: DOB NOW: Safety Boiler, DOB NOW: Safety – Facades Compliance Filings, Lead Service Line Location Coordinates · as of 2026-01-30
Clean in the records
Registered with the city

TRUSTEES OF COLUMBIA UNIVERSITY

Checked in city records
Checked in city records: non-lead water line, boiler filing with no defects (Aug 2026), facade filed as safe
Source: DOB NOW: Safety Boiler, DOB NOW: Safety – Facades Compliance Filings, Lead Service Line Location Coordinates · as of 2026-01-30

Apartments named in these records

1 of this building’s 3 apartments is named in a city record. The rest have no record naming them, which is the usual case.

These are city records about an apartment, not about anyone who lives or lived there. They may not be used to screen a tenant.

Heat and hot water

Older records on file
Heat source

Boiler burning No. 2 oil (Federal FST-125), registration current since Oct 2025

Clean Air Tracking System (boiler registrations), as of 2026-10-20 · See this building's boiler registrations on NYC Open Data →
Boiler inspection filings

Latest accepted inspection Aug 2026, defects reported: no

DOB NOW: Safety Boiler, as of 2026-10-19 · See the boiler filings at DOB →
What this counts

Accepted annual boiler inspection filings, any date

Boiler work permits

Latest boiler work permit 2024 (2 on record)

DOB Permit Issuance (BIS), as of 2026-10-19
What this counts

DOB boiler permits (BIS and DOB NOW); a permit dates work, not the boiler's age

  • Heat and hot water complaintsfound0 heat or hot water complaints

Water and pipes

No issues on record
Water service line

Non-Lead (records)

Lead Service Line Location Coordinates, as of 2026-01-30

Pests and cleanliness

1 resolved in 2024

Fire and safety

No issues on record
What has happened here

Structure and facade

Issues on record, most recently 2022
Facade rating

Safe (cycle 10, filed Aug 2026)

DOB NOW: Safety – Facades Compliance Filings, as of 2026-10-19 · See the facade filings at DOB →
What this counts

Most recent facade (FISP) filing in the latest 5-year cycle

  • Sidewalk shed and scaffoldingfoundNo active shed permit; permits since Dec 2025, last expired Sep 2026
  • Landmark statusno recordNot in a historic district on record

Flooding

No issues on record
FEMA flood zone

Outside FEMA's 1% annual-chance flood zone: X

FEMA National Flood Hazard Layer, as of 2026-10-20
What this counts

Effective FIRM zones touching the building footprint

Stormwater flooding

Extreme storm, 2080 sea levels: Not in mapped flooding; Moderate storm, 2050 sea levels: Not in mapped flooding; Moderate storm, today's sea levels: Not in mapped flooding; Limited storm, today's sea levels: Not loaded (file format unreadable)

NYC Stormwater Flood Maps, as of 2024-07-03
What this counts

Mapped ponding touching the building footprint

BasementWhole tax lot

Below grade

PLUTO (tax lot data), as of 2026-08-24

Elevators

No issues on record
Elevators

1 active elevator; latest periodic inspection Jan 2026

DOB NOW Elevator Safety Compliance, as of 2026-10-19 · See this building's elevators on NYC Open Data →
What this counts

Active elevator devices registered to this building ID

Energy

Energy

ENERGY STAR score 16 (2024 report)

Energy and Water Data Disclosure (Local Law 84), as of 2025-11-25
What this counts

Letter grades are issued by the city under Local Law 33 and posted near the building entrance; Blueflo shows the reported score only

General condition and all records

Permit history

16 permits since 1990

DOB NOW: Build – Approved Permits, as of 2026-10-19 · See every permit at DOB →
What this counts

DOB permits issued (DOB NOW and legacy BIS), one per job and work type; excludes sheds

  • HPD violationsfound0 open. Also 2 older records from 2013 never closed. 2 further violations from 2023–2024 were closed. 9 violations on record in all, 1987–2024 — the 4 most recent are listed here
  • Resident complaints to the cityfoundno complaints. None in the last 2 years, but 1 earlier complaint on record from 2024

Nothing on record

Gasno record
  • Gas pipingno recordNo open gas piping filing violations. Inspection results themselves are not published
Rent and tenancyNot applicable
  • Rent stabilizationnot requiredNot on the state's list. Rent stabilization generally applies to buildings with 6 or more apartments

Sources

23 datasets

Each date is when we last checked that dataset, not when the record itself was created.