Building health · MANHATTAN, NY

21 Convent Ave

built 1920 · 5 stories · 24 apartments
Also known as 423 W 128 St — one building, several doors.

Apartments named in these records

8 of this building’s 24 apartments are 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

3 complaints, 2025–2026 · 1 in the past year
Heat source

Boiler burning natural gas (Rudd RCB-825), registration current since May 2024

Clean Air Tracking System (boiler registrations), as of 2026-10-19 · See this building's boiler registrations on NYC Open Data →
Boiler inspection filings

Latest accepted inspection Mar 2026, defects reported: no

DOB NOW: Safety Boiler, as of 2026-10-17 · See the boiler filings at DOB →
What this counts

Accepted annual boiler inspection filings, any date

Boiler work permits

Latest boiler work permit 1998

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 complaints

2 heat or hot water complaints

Housing Maintenance Code Complaints and Problems, as of 2026-10-19 · See the complaints at HPD Online →
What this counts

HPD complaints, heat season 2025–26 (Oct 1–May 31)

Water and pipes

2 complaints, 2025 · 1 in the past year

Pests and cleanliness

1 complaint, 2025

Fire and safety

Issues on record, most recently 2024

Electrical

Older records on file
What has happened here

Structure and facade

Issues on record, most recently 2022

Flooding

No issues on record
FEMA flood zone

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

FEMA National Flood Hazard Layer, as of 2026-10-19
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

Rent and tenancy

On the state list
Rent stabilization

On the state's list of buildings with at least one rent-stabilized apartment (2024 registrations)

Rent Stabilized Building Lists (2024 HCR registrations), as of 2025-11-30
What this counts

The list doesn't say which apartments are stabilized, and being listed isn't proof of current status. For a specific apartment, request its rent history from HCR

Energy

Energy

ENERGY STAR score 1 (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

HPD violations

15 open: 15 about building conditions — walls, floors and stairs (6), leaks (3), fire safety (2), doors and windows (1); 2 immediately hazardous (class C). Also 26 older records from 2000–2016 never closed. 12 further violations from 2024–2025 were closed. 125 violations on record in all, 1999–2025 — the 53 most recent are listed here

2025 Oct
MoldApt 5 class B · closed
2025 Oct
PestsApt 5 class C · closed
2025 Oct
MoldApt 5 class A · closed
2025 Oct
Other conditionsApt 5 class A · closed
2025 Aug
Walls, floors and stairsApt 23 class B · closed
2025 Aug
Smoke or CO detectorsApt 23 class B · closed
2025 Aug
Smoke or CO detectorsApt 23 class B · closed
2025 Aug
Fire safetyApt 23 class C · closed
Show 29 more
2025 Aug
PestsApt 23 class C · closed
2025 Aug
PestsApt 23 class C · closed
2024 Oct
Fire safety class B
2024 May
Fire safety class C
2024 May
Fire safety class B · closed
2024 May
Fire safety class C · closed
2022 May
Doors and windowsApt 9 class A
2020 Jul
Smoke or CO detectors class A
2020 Jan
Walls, floors and stairsApt 9 class A
2020 Jan
Walls, floors and stairsApt 9 class B
2020 Jan
MoldApt 9 class B
2020 Jan
PestsApt 9 class C
2018 Dec
Walls, floors and stairsApt 20 class B
2018 Dec
LeaksApt 20 class B
2018 Dec
Walls, floors and stairsApt 20 class B
2018 Dec
Walls, floors and stairsApt 20 class B
2018 Dec
LeaksApt 20 class B
2018 Dec
Walls, floors and stairsApt 20 class B
2018 Dec
LeaksApt 20 class B
2016 Mar
Fire safety class B · never closed
2015 Dec
Walls, floors and stairsApt 3 class B · never closed
2015 Feb
Fire safety class B · never closed
2015 Feb
Walls, floors and stairsApt 3 class B · never closed
2015 Feb
Fire safetyApt 3 class B · never closed
2015 Feb
PlumbingApt 3 class B · never closed
2015 Feb
Fire safetyApt 3 class B · never closed
2013 Dec
Doors and windowsApt 20 class B · never closed
2013 Apr
Smoke or CO detectorsApt 3 class B · never closed
2011 Mar
Walls, floors and stairsApt 23 class B · never closed
and 4 more at the source
Housing Maintenance Code Violations, as of 2026-10-19 · Read these violations in full at HPD Online →
What this counts

Open HPD violations inspected in the last 10 years; class C = immediately hazardous. Paperwork = failure to file, notify or certify

DOB violations

2 open: 2 about filings or paperwork

DOB Violations, as of 2026-10-18 · Read these violations in full at DOB →
What this counts

Open DOB, ECB and DOB NOW Safety violations, any date, one per violation. ECB class 1 = hazardous, class 2 = major

Resident complaints to the city

3 heat or hot water, 2 plumbing, 1 mold, 1 paint or plaster

Housing Maintenance Code Complaints and Problems, as of 2026-10-19 · See the complaints at HPD Online →
What this counts

HPD complaints received in the last 2 years; the list below is every complaint on record for the last three years

Permit history

14 permits since 1990

DOB NOW: Build – Approved Permits, as of 2026-10-17 · See every permit at DOB →
What this counts

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

Nothing on record

Gasno record
  • Gas pipingno recordNo open gas piping filing violations. Inspection results themselves are not published
ElevatorsNot applicable
  • Elevatorsnot requiredNo elevators registered to this building

Sources

23 datasets

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

Every row shows the record it came from and the date it was last checked.
These are city records, not an inspection by Blueflo. Every item shows its source and the date it was last checked.
Report an error · Talk to us · Look up another building
Not an inspection and not a warranty. May not be used for tenant screening — terms of use · privacy.
For AI and developers: llms.txt · API · MCP server · this card as markdown