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ViolationScout27 certifications filed against 6 new Class C in the last 180 days.Is this your building?
Buildings312 East 21 Street, BrooklynCurrent through

312 East 21st St, Brooklyn

BBL 3-05124-0012

En español: 23 violaciones de Clase C abiertas (peligro inmediato) y 50 abiertas en total. La más antigua del HPD lleva 37 años abierta, desde el 31 de mayo de 1989.

Certifications are being filed faster than new violations come in. 27 certifications filed against 6 new Class C in the last 180 days.

The oldest open HPD violation has been open 37 years, since May 31, 1989.

Since September 29, 2023, certifications were filed on 36 Class C violations: 33 by the original certify-by date, 3 after it. How certification works

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23 open Class C. The oldest open HPD violation was filed May 31, 1989.

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The building report reads this record for you: every open violation in the city's own words, what each status means, and how the building compares with others its size. Usually ready within 15 minutes of payment.

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HPD takes complaints from tenants through 311.

DOB violations
2 active DOB violations. The newest was issued October 4, 2023.
Housing court
2 open housing court cases, most of them tenant actions. The newest opened June 4, 2026.
DOB complaints
2 DOB complaints, 1 of them conversion complaint, in the 12 months to September 25, 2026. The newest was filed May 15, 2026.
Energy benchmarking
ENERGY STAR score 65 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).
Boiler inspection
Inspected April 28, 2026. Boilers in buildings with 6 or more apartments are inspected every calendar year.
Bedbug report
Filed May 25, 2026, for the year to October 31, 2025. Buildings with 3 or more apartments file one with HPD every year.
Rent stabilization
Has rent-stabilized apartments (2024 registration).

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 C23 open most often Vermin / Infestation
Notice sent19232013
Vermin / InfestationNotice sent to tenant19184511
Vermin / InfestationNotice sent to tenant19184510
Notice sent19009354312 East 21 Holding LLC
Vermin / InfestationNot complied with18994631312 East 21 Holding LLC
Vermin / InfestationNot complied with18994626312 East 21 Holding LLC
Vermin / InfestationNotice sent to tenant18357210312 East 21 Holding LLC
Vermin / InfestationNotice sent to tenant18357209312 East 21 Holding LLC
Vermin / InfestationNot complied with18057985
Vermin / InfestationNot complied with18057984
The report lists all 23, each with the city's own words and the date on its notice. What the report adds
Class B27 open most often Fire Safety
Notice sent19232016
Notice sent19232015
Notice sent19232014
Fire SafetyNotice sent19190774
Fire SafetyNotice sent19190773
Notice sent19190772
Notice sent19165782312 East 21 Holding LLC
Notice sent19165781312 East 21 Holding LLC
Certified on time19130142312 East 21 Holding LLC
Certified on time19130141312 East 21 Holding LLC
The report lists all 27, each with the city's own words and the date on its notice. What the report adds

The full report on 312 East 21st St, Brooklyn

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

Vermin and pests in Brooklyn

Other buildings on this tax block

Nearby buildings

Questions about this building

Does 312 East 21 Street, Brooklyn have open violations?

Yes. 312 East 21 Street, Brooklyn had 50 open violations on September 27, 2026: 50 from HPD. 23 are Class C, the class HPD treats as immediately hazardous. The oldest open HPD violation has been open 37 years, since May 31, 1989.

Is 312 East 21 Street, Brooklyn getting better or worse?

Certifications are being filed faster than new violations come in. 27 certifications filed against 6 new Class C in the last 180 days. That window ends September 27, 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 312 East 21 Street, Brooklyn?

Since September 29, 2023, certifications were filed on 36 Class C violations: 33 by the original certify-by date, 3 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 312 East 21 Street, Brooklyn have active DOB violations?

Yes. 2 active DOB violations. The newest was issued October 4, 2023. 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.

Is 312 East 21 Street, Brooklyn in housing court?

Yes. 2 open housing court cases, most of them tenant actions. The newest opened June 4, 2026. HPD takes buildings to housing court to get violations fixed and heat and hot water restored, and it joins tenants' own repair cases, called tenant actions. A case stays open until the court closes it.

Has DOB received complaints about 312 East 21 Street, Brooklyn?

Yes. 2 DOB complaints, 1 of them conversion complaint, in the 12 months to September 25, 2026. The newest was filed May 15, 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.

What is the ENERGY STAR score for 312 East 21 Street, Brooklyn?

ENERGY STAR score 65 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.

When was the boiler at 312 East 21 Street, Brooklyn last inspected?

On April 28, 2026. DOB requires a boiler in a building with 6 or more apartments to be inspected once every calendar year, with the report filed within 14 days of the inspection. Low-pressure boilers in residential buildings with 5 or fewer apartments are exempt.

When did 312 East 21 Street, Brooklyn last file its bedbug report?

On May 25, 2026, for the year to October 31, 2025. HPD asks the owner of every building with 3 or more apartments for this report once a year, covering November 1 to October 31, including buildings that had no bedbugs.

Is 312 East 21 Street, 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 312 East 21 Street, 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 312 East 21 Street, Brooklyn built?

The city's record gives 1940 as the year 312 East 21 Street, Brooklyn was built, in the Department of City Planning's PLUTO tax-lot file. The same file classes it as an elevator apartment building with 6 floors.

How many apartments does 312 East 21 Street, Brooklyn have?

The Department of City Planning's PLUTO tax-lot file lists 54 residential units at 312 East 21 Street, 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, HPD's housing court cases, DOB complaints, the Rent Guidelines Board's stabilized-building lists, Local Law 84 energy reports, DOB boiler inspection reports, HPD's annual bedbug reports, DOB's Local Law 97 covered buildings list and the city's PLUTO tax-lot file. This page is current through September 27, 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, HPD's housing court cases, DOB complaints, the Rent Guidelines Board's stabilized-building lists, Local Law 84 energy reports, DOB boiler inspection reports, HPD's annual bedbug 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, 312 East 21st St, Brooklyn: 23 open Class C, from New York City's HPD violation and OATH/ECB hearing data. Figures through September 27, 2026. https://violationscout.com/building/312-east-21-street-brooklyn

How we count: /method.

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