1647 Union St

Walls, floors and stairsApt 4G class B · HPD violation

Walls, floors and stairsApt 4G class B · HPD violation

Walls, floors and stairsApt 4G class B · HPD violation

Walls, floors and stairsApt 4G class C · HPD violation

2026 Jun

Walls, floors and stairsApt 2B class B · closed · HPD violation

2026 Jun

Walls, floors and stairsApt 2B class A · closed · HPD violation

Show 7 more

Walls, floors and stairsApt 4C class B · closed · HPD violation

Doors and windowsApt 3G class C · closed · HPD violation

2025 Dec

Walls, floors and stairsApt 4A class B · closed · HPD violation

Walls, floors and stairs class B · closed · HPD violation

2020 Jul

General construction permit

2019 Apr

Walls, floors and stairsApt 2E class A · HPD violation

2019 Apr

Doors and windowsApt 2E class C · HPD violation

Facade ratingnot requiredNot required: facade inspections apply only to buildings taller than 6 stories
Sidewalk shed and scaffoldingno recordNo sidewalk shed permits on record
Landmark statusno recordNot in a historic district on record

Heat and hot water

Issues on record (2023) · 21 complaints, 2024–2026 · 10 in the past year

What has happened here

2026 Mar

Heat or hot waterApt 4G class C · closed · HPD violation

Heat or hot water class C · closed · HPD violation

Heat or hot waterApt 3G class C · closed · HPD violation

Show 40 more

Heat or hot waterApt 4B complaint

Heat or hot water class C · closed · HPD violation

Heat or hot waterApt 4B class C · closed · HPD violation

Heat or hot waterApt 4B class C · closed · HPD violation

Heat or hot waterApt 4B complaint

2025 Dec

2025 Nov

Heat or hot waterApt 4E complaint

2025 Nov

2025 Jun

2025 Jun

Heat or hot water class C · closed · HPD violation

Heat or hot waterApt 3G class C · closed · HPD violation

Heat or hot water class B · closed · HPD violation

2025 Jan

2024 Oct

2024 Oct

2024 Jul

2024 Jul

Heat or hot waterApt 4B complaint

Heat or hot waterApt 3B complaint

BE-EXT-LP Boiler DOB violation

2023 Nov

2023 Nov

Low Pressure Boiler DOB violation

2023 Jun

2019 Nov

Low Pressure Boiler DOB violation

Heat source

Boiler burning No. 2 oil (Federal FST-50), registration expired since Aug 2021

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 Feb 2024, 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

Heat and hot water complaints

12 heat or hot water complaints

Housing Maintenance Code Complaints and Problems, as of 2026-10-20 · See the complaints at HPD Online →

What this counts

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

Boiler work permitsno recordNo boiler work permits on record

Water and pipes

Issues on record · 3 complaints, 2024–2026 · 1 in the past year

What has happened here

LeaksApt 4G class B · HPD violation

LeaksApt 4G class B · HPD violation

LeaksApt 4A class B · closed · HPD violation

LeaksApt 4D complaint

2025 Dec

PlumbingApt 2F complaint

Plumbing class B · closed · HPD violation

Show 6 more

2024 Dec

PlumbingApt 2E complaint

PlumbingApt 3E complaint

Plumbing, leaksApt 4E complaint

Plumbing complaint

2024 Feb

LeaksApt 4A complaint

2021 Mar

Plumbing permit

Water service line

Unknown - Lead Status Unknown (not verified)

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

Pests and cleanliness

1 complaint, 2024

What has happened here

PestsApt 4C class C · closed · HPD violation

Pests class A · paperwork · closed · HPD violation

2025 Jun

Pests class A · paperwork · closed · HPD violation

2024 Dec

MoldApt 2E complaint

2019 Apr

PestsApt 2E class C · HPD violation

Fire and safety

Issues on record, most recently 2024

What has happened here

Fire safetyApt 3E class C · HPD violation

Electrical

1 complaint, 2026

What has happened here

ElectricalApt 4D complaint

Electrical class B · closed · HPD violation

2024 Aug

ElectricalApt 4G complaint

ElectricalApt 3E complaint

ElectricalApt 4E complaint

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

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 STAR score 54 (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

10 open: 10 about building conditions — walls, floors and stairs (5), leaks (2), doors and windows (1), fire safety (1); 4 immediately hazardous (class C). 25 further violations from 2025–2026 were closed. 241 violations on record in all, 1999–2026 — the 78 most recent are listed here

Walls, floors and stairsApt 4G class B

LeaksApt 4G class B

Walls, floors and stairsApt 4G class B

LeaksApt 4G class B

Walls, floors and stairsApt 4G class B