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ViolationScout23 certifications filed against 6 new Class C in the last 180 days.Is this your building?
Buildings4123 9 Avenue, BrooklynCurrent through

4123 9th Ave, Brooklyn

BBL 3-05590-0001

En español: 17 violaciones de Clase C abiertas (peligro inmediato) y 70 abiertas en total.

Certifications are being filed faster than new violations come in. 23 certifications filed against 6 new Class C in the last 180 days.

Since September 28, 2023, certifications were filed on 16 Class C violations: 14 by the original certify-by date, 2 after it. How certification works

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17 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.

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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
1 active DOB violation, issued December 1, 2024.
DOB complaints
2 DOB complaints in the last 12 months. The newest was filed July 6, 2026.
Energy benchmarking
ENERGY STAR score 15 for 2024, against a median of 67 for Multifamily Housing that year.
Local Law 97
Covered under Article 321, the path for certain affordable housing and houses of worship (DOB's list, March 1, 2026).
Rent stabilization
Has rent-stabilized apartments (2024 registration).
HPD emergency repair orders
2 completed HPD emergency repair orders since September 28, 2023, awarded for $1,627 in total. The most recent of the 2, a general construction order, was opened January 8, 2026.

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 C17 open most often Vermin / Infestation
Vermin / InfestationNotice sent19236068
Vermin / InfestationNotice sent19233384
Certified on time19217321
Fire SafetyNotice sent19026718CONGREGATION YEHUDA AND MEIR TZVI
Vermin / InfestationNotice sent to tenant18761275
Vermin / InfestationNotice sent to tenant18761272
Lead PaintNotice sent18733401
Vermin / InfestationInvalid certification18727359
Vermin / InfestationNotice sent to tenant18468957
Heat / Hot WaterNotice sent18445042
Notice sent17871664
Notice sent17871659
Notice sent17861443
Notice sent17861439
Lead PaintNotice sent17963397
Lead PaintNotice sent17963396
Vermin / InfestationNotice sent17335611
Class B52 open most often Fire Safety
Notice sent19236067
Notice sent19236066
Notice sent19233383
Fire SafetyNot complied with19026717CONGREGATION YEHUDA AND MEIR TZVI
Fire SafetyNot complied with19026716CONGREGATION YEHUDA AND MEIR TZVI
Not complied with19026715CONGREGATION YEHUDA AND MEIR TZVI
Not complied with19026714CONGREGATION YEHUDA AND MEIR TZVI
Fire SafetyInvalid certification18761277
Fire SafetyInvalid certification18761276
Notice sent18761274
Invalid certification18761273
Fire SafetyNotice sent18727361
Fire SafetyNotice sent18727360
Notice sent18727357
Notice sent18727355
Notice sent18727354
Notice sent18727353
Notice sent18727352
Notice sent18727351
Notice sent18727349
Notice sent18649834
Notice sent18649833
Notice sent18649831
Notice sent18649830
Notice sent18649829
Fire SafetyInvalid certification18639055
Fire SafetyInvalid certification18639054
Fire SafetyNotice sent18468955
Fire SafetyNotice sent18468954
Invalid certification18445045
Fire SafetyNotice sent18445044
Fire SafetyNotice sent18445043
Invalid certification18370717
Invalid certification18370716
Invalid certification18370715
Notice sent18177586
Notice sent18177585
Notice sent18167964
Notice sent18167963
Notice sent18167962
Notice sent18167961
Notice sent18160376
Notice sent18160375
Lead PaintNotice sent17989674
Lead PaintNotice sent17989673
Lead PaintNotice sent17989671
MoldNotice sent18201245
Notice sent17335610
Notice sent17005758
Notice sent16923873
Notice sent16592568
Notice sent16592567
OATH/ECB1 open
Construction, Class 1Decided by default39187442N

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Questions about this building

Does 4123 9 Avenue, Brooklyn have open violations?

Yes. 4123 9 Avenue, Brooklyn had 70 open violations on September 26, 2026: 69 from HPD and 1 from OATH/ECB. 17 are Class C, the class HPD treats as immediately hazardous.

Is 4123 9 Avenue, Brooklyn getting better or worse?

Certifications are being filed faster than new violations come in. 23 certifications filed against 6 new Class C in the last 180 days. 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 4123 9 Avenue, Brooklyn?

Since September 28, 2023, certifications were filed on 16 Class C violations: 14 by the original certify-by date, 2 after it. 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 4123 9 Avenue, Brooklyn have active DOB violations?

Yes. 1 active DOB violation, issued December 1, 2024. 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.

Has DOB received complaints about 4123 9 Avenue, Brooklyn?

Yes. 2 DOB complaints in the last 12 months. The newest was filed July 6, 2026. Anyone can complain to DOB about a building or the work going on in it, and DOB then inspects and decides whether there is a violation. A conversion complaint says an apartment may have been added or changed without approval. It is a complaint, not a finding.

Are any HPD emergency repair orders at 4123 9 Avenue, Brooklyn marked completed?

Yes. 2 completed HPD emergency repair orders since September 28, 2023, awarded for $1,627 in total. The most recent of the 2, a general construction order, was opened January 8, 2026. 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.

What is the ENERGY STAR score for 4123 9 Avenue, Brooklyn?

ENERGY STAR score 15 for 2024, against a median of 67 for Multifamily Housing that year. Buildings over 25,000 square feet report their energy use to the city every year under Local Law 84. The ENERGY STAR score runs from 1 to 100 and compares a building with similar ones nationwide; 50 is the national median. The score is the one the city publishes, and this page never estimates a Local Law 97 emissions penalty. A lot that reported several properties in one year is not scored here.

Is 4123 9 Avenue, Brooklyn covered by Local Law 97?

Yes. It is on DOB's Local Law 97 covered buildings list. Covered under Article 321, the path for certain affordable housing and houses of worship (DOB's list, March 1, 2026). Local Law 97 sets greenhouse gas limits for most New York City buildings over 25,000 square feet, and DOB's covered buildings list says which path each building is on. The list reflects DOB's records, which owners can ask DOB to correct. This page never estimates a penalty or says whether a building complies.

Is 4123 9 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 4123 9 Avenue, Brooklyn built?

The city's record gives 1916 as the year 4123 9 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 4123 9 Avenue, Brooklyn have?

The Department of City Planning's PLUTO tax-lot file lists 38 residential units at 4123 9 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, DOB complaints, the Rent Guidelines Board's stabilized-building lists, HPD emergency repair orders, Local Law 84 energy reports, DOB's Local Law 97 covered buildings list 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, DOB complaints, the Rent Guidelines Board's stabilized-building lists, HPD emergency repair orders, Local Law 84 energy reports, DOB's Local Law 97 covered buildings list 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, 4123 9th Ave, Brooklyn: 17 open Class C, from New York City's HPD violation and OATH/ECB hearing data. Figures through September 26, 2026. https://violationscout.com/building/4123-9-avenue-brooklyn

How we count: /method.

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