# 4307 12 Avenue, Brooklyn, NY

Public-record building report from Know Your Building (https://knowyourbuilding.nyc/building/3056040006/4307-12-avenue-brooklyn).
BBL 3056040006 · BIN 3136133 · Generated 2026-10-24

## Concern level: severe

- 17 open class-C HPD violations (immediately hazardous) across 16 apartments
- 15 of those issued in the last 3 years
- 2 open rent-impairing violation(s)
- 11 active DOB violation(s)

Scale: low, moderate, high, severe. Set from open hazardous violations relative to building size, raised by distress signals (HPD's Alternative Enforcement Program, court harassment findings, evictions, unpaid OATH/ECB fines, open housing-court cases, a sold tax lien). It describes the public record, not any one apartment.

## Rent stabilization

Likely rent-stabilized. The owner registered 16 stabilized units for 2023, of about 16 apartments.
Registered units by year: 2018: 16, 2019: 16, 2020: 16, 2021: 16, 2022: 16, 2023: 16.
No public data says which specific apartment is stabilized; tenants can request their rent history from NYS Homes and Community Renewal.

## The building

built 1916, 4 floors, 16 residential units.

## HPD housing-maintenance violations

28 open (class C immediately hazardous: 17, class B hazardous: 10, class A non-hazardous: 1); 317 on record.
15 open class-C violations were issued in the last 3 years.
2 open violations are rent-impairing.

## DOB building violations

11 active (2 issued in the last 3 years); 11 on record.

## OATH/ECB violations and fines

7 active of 13 on record; 0 decided by default; $625 balance due.

## 311 housing complaints

14 in the last 12 months; 43 on record.
Most common: HEAT/HOT WATER (25), PAINT/PLASTER (4), UNSANITARY CONDITION (4), PLUMBING (4), APPLIANCE (2).

## Bedbugs

7 annual bedbug filings by the owner; latest reports 0 infested units.

## Evictions

0 executed in the last 3 years; 0 on record.

## Housing court (HPD litigation)

12 cases on record, 0 open, 8 tenant-initiated, 0 with a court finding of harassment.

## Landlord

- CorporateOwner: MAZEL 12AV LLC
- Agent: MAZEL 12AV LLC
- HeadOfficer: ARON GUMBU
- Officer: ARON GUMBU
- SiteManager: Reuven Gumbu

The same owner is linked to 2 other buildings (ARON GUMBU at 1274 49ST #153).

## Sources and limits

NYC Open Data (HPD, DOB, OATH/ECB, 311, DOF, PLUTO) and NYS DHCR building lists. This is a screening signal from public records, not legal advice; records lag and contain errors. Full interactive report with violation details and maps: https://knowyourbuilding.nyc/building/3056040006/4307-12-avenue-brooklyn