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ViolationScout13 open Class C, with 4 certifications filed and 1 new Class C in the last 180 days, too few to call a direction.Is this your building?
Buildings4307 12 Avenue, BrooklynCurrent through

4307 12th Ave, Brooklyn

BBL 3-05604-0006

En español: 13 violaciones de Clase C abiertas (peligro inmediato) y 20 abiertas en total.

Open violations are sitting, with little movement either way. 13 open Class C, with 4 certifications filed and 1 new Class C in the last 180 days, too few to call a direction.

Since September 28, 2023, certifications were filed on 35 Class C violations, all 35 by the original certify-by date. How certification works

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13 open Class C.

We read every request ourselves. When a compliance firm we work with can take the building, we introduce you to that one firm. One firm, not a list.

Your details stay with us, and go only to the one firm you are introduced to. No lists, no resale.

¿Es su edificio? Déjenos un correo o un teléfono. Leemos cada solicitud.

Or file it yourself: what it can hold up, and how correction is filed

The case file on a building like this names who is responsible on HPD's registration and how to reach them. We prepare them for firms on our pilot, ranked by how much hazardous work is open.

Request a sample file

The building report reads this record for you: which violations matter, and how long this kind usually takes to clear. It is not on sale yet.

See what the report covers

HPD takes complaints from tenants through 311.

DOB violations
11 active DOB violations, most of them for low-pressure boilers. The newest was issued November 14, 2025.
Rent stabilization
Has rent-stabilized apartments (2024 registration).
HPD emergency repair orders
2 completed HPD emergency repair orders since September 28, 2023, awarded for $985 in total. The most recent of the 2, a general construction order, was opened May 15, 2024.

Open violations by class. A party is named only where the building's HPD registration covers the date a violation was filed.

FiledCategoryStatusNumberRegistered party when filed
Class C13 open most often Vermin / Infestation
No access to reinspect (first try)19095628
Vermin / InfestationNot complied with18445005
Vermin / InfestationNot complied with18441286
Vermin / InfestationDefect letter sent16526590
Vermin / InfestationNot complied with16526589
Vermin / InfestationDefect letter sent16498167
Vermin / InfestationNot complied with16498166
Vermin / InfestationDefect letter sent16440154
Vermin / InfestationNot complied with16440153
Vermin / InfestationNot complied with16418477
MoldDefect letter sent16623773
Lead PaintNo access to reinspect (first try)16310393
Vermin / InfestationNot complied with16302287
Class B6 open
Notice sent19105737MAZEL 12AV LLC
Notice sent19105731MAZEL 12AV LLC
Notice sent19095635
Notice sent19095631
MoldDefect letter sent17219569
Not complied with16920404
OATH/ECB1 open
Boilers, Class 2Found in violation39097215Y

The most common category among the open records here is vermin and pests.

Vermin and pests in Brooklyn

Nearby buildings

Questions about this building

Does 4307 12 Avenue, Brooklyn have open violations?

Yes. 4307 12 Avenue, Brooklyn had 20 open violations on September 26, 2026: 19 from HPD and 1 from OATH/ECB. 13 are Class C, the class HPD treats as immediately hazardous.

Is 4307 12 Avenue, Brooklyn getting better or worse?

Open violations are sitting, with little movement either way. 13 open Class C, with 4 certifications filed and 1 new Class C in the last 180 days, too few to call a direction. That window ends September 26, 2026. It compares certifications filed with new Class C violations, and it describes what happened, not what anyone intends.

When were certifications filed on Class C violations at 4307 12 Avenue, Brooklyn?

Since September 28, 2023, certifications were filed on 35 Class C violations, all 35 by the original certify-by date. A certification is the filing, dated when it was made, not HPD's acceptance of it. It is compared with the original certify-by date on the notice. A granted postponement moves that date and the city's data keeps only the first, so a certification counted after it may still have met a postponed date.

Does 4307 12 Avenue, Brooklyn have active DOB violations?

Yes. 11 active DOB violations, most of them for low-pressure boilers. The newest was issued November 14, 2025. The Department of Buildings writes these separately from HPD's housing violations, for things like boilers, elevators, facades, construction and energy filings. Each one stays active until DOB resolves or dismisses it.

Are any HPD emergency repair orders at 4307 12 Avenue, Brooklyn marked completed?

Yes. 2 completed HPD emergency repair orders since September 28, 2023, awarded for $985 in total. The most recent of the 2, a general construction order, was opened May 15, 2024. HPD orders an emergency repair when a hazardous condition cited in a violation, or in another agency's emergency order, is not corrected, and does the work itself or through a contractor. The amounts are what the orders were awarded for, not a bill: this page does not show what was charged to the property or whether it was paid. Orders for lab tests, such as dust-wipe and asbestos samples, are not counted.

Is 4307 12 Avenue, Brooklyn rent stabilized?

The building has rent-stabilized apartments on its 2024 registration. That comes from the Rent Guidelines Board's list of buildings with at least one stabilized apartment registered that year. Buildings that registered late are left off, and a 421-a or J-51 building can leave stabilization when its tax benefit ends. A particular apartment's status is for NYS HCR to say.

When was 4307 12 Avenue, Brooklyn built?

The city's record gives 1916 as the year 4307 12 Avenue, Brooklyn was built, in the Department of City Planning's PLUTO tax-lot file. The same file classes it as a walk-up apartment building with 4 floors.

How many apartments does 4307 12 Avenue, Brooklyn have?

The Department of City Planning's PLUTO tax-lot file lists 16 residential units at 4307 12 Avenue, Brooklyn. The count is for the whole tax lot.

Where do these numbers come from?

From New York City's own data: HPD housing violations and OATH/ECB hearing results, read whole rather than sampled. It also draws on DOB violations, the Rent Guidelines Board's stabilized-building lists, HPD emergency repair orders and the city's PLUTO tax-lot file. This page is current through September 26, 2026. The city's data changes daily, so a violation certified after that can still show as open here; the city's own page for this building is linked above.

Sources. HPD housing violations and OATH/ECB hearing results, plus DOB violations, the Rent Guidelines Board's stabilized-building lists, HPD emergency repair orders and the city's PLUTO tax-lot file. Counts cover HPD Class B and C violations from the last 3 years that HPD still shows open, and OATH/ECB summonses from the same 3 years that the city still shows active. The city's own pages can show more, never fewer.

Cite this page

ViolationScout, 4307 12th Ave, Brooklyn: 13 open Class C, from New York City's HPD violation and OATH/ECB hearing data. Figures through September 26, 2026. https://violationscout.com/building/4307-12-avenue-brooklyn

How we count: /method.

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