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ViolationScout16 new Class C against 1 certification filed in the last 180 days.Is this your building?
Buildings509 Hinsdale Street, BrooklynCurrent through

509 Hinsdale St, Brooklyn

BBL 3-03835-0021

En español: 135 violaciones de Clase C abiertas (peligro inmediato) y 321 abiertas en total. La más antigua del HPD lleva 27 años abierta, desde el 9 de octubre de 1998.

New violations are coming in faster than certifications are filed. 16 new Class C against 1 certification filed in the last 180 days.

The oldest open HPD violation has been open 27 years, since October 9, 1998.

Since September 29, 2023, a certification was filed on 1 Class C violation, by the original certify-by date. How certification works

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135 open Class C. The oldest open HPD violation was filed October 9, 1998.

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HPD takes complaints from tenants through 311.

Alternative Enforcement Program
In HPD's Alternative Enforcement Program since January 31, 2024.
DOB violations
3 active DOB violations. The newest was issued October 2, 2025.
Housing court
1 open housing court case, opened January 15, 2026.
DOB complaints
4 DOB complaints in the 12 months to September 25, 2026. The newest was filed June 17, 2026.
DOB permits
1 DOB work permit in effect, for Sidewalk Shed work, issued January 30, 2026.
Bedbug report
Filed December 16, 2025, 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).
HPD emergency repair orders
4 completed HPD emergency repair orders since September 29, 2023, awarded for $91,481 in total. The most recent of the 4, a general construction order, was opened October 20, 2025.

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 C135 open most often Vermin / Infestation
Notice sent19172441RIVERDALE AVENUE PROPERTIES LLC
Notice sent19172433RIVERDALE AVENUE PROPERTIES LLC
Invalid certification19172424RIVERDALE AVENUE PROPERTIES LLC
Notice sent19097149RIVERDALE AVENUE PROPERTIES LLC
Notice sent19097141RIVERDALE AVENUE PROPERTIES LLC
Notice sent19097128RIVERDALE AVENUE PROPERTIES LLC
Notice sent19097120RIVERDALE AVENUE PROPERTIES LLC
Vermin / InfestationNotice sent to tenant19097096RIVERDALE AVENUE PROPERTIES LLC
Vermin / InfestationNotice sent to tenant19097095RIVERDALE AVENUE PROPERTIES LLC
Notice sent19097094RIVERDALE AVENUE PROPERTIES LLC
The report lists all 135, each with the city's own words and the date on its notice. What the report adds
Class B184 open most often Fire Safety
Fire SafetyNotice sent19172431RIVERDALE AVENUE PROPERTIES LLC
Fire SafetyNotice sent19172430RIVERDALE AVENUE PROPERTIES LLC
Notice sent19097158RIVERDALE AVENUE PROPERTIES LLC
Notice sent19097154RIVERDALE AVENUE PROPERTIES LLC
Notice sent19097136RIVERDALE AVENUE PROPERTIES LLC
Notice sent19097040RIVERDALE AVENUE PROPERTIES LLC
MoldNo access to reinspect (first try)18975055RIVERDALE AVENUE PROPERTIES LLC
Fire SafetyNotice sent18610143RIVERDALE AVENUE PROPERTIES LLC
Fire SafetyNotice sent18610142RIVERDALE AVENUE PROPERTIES LLC
Notice sent18610138RIVERDALE AVENUE PROPERTIES LLC
The report lists all 184, each with the city's own words and the date on its notice. What the report adds
OATH/ECB2 open most often Construction
Construction, Class 1Decided by default39193717YRIVERDALE AVENUE PROPERTIES LLC
Construction, Class 1Decided by default39162292X

The full report on 509 Hinsdale St, Brooklyn

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Questions about this building

Does 509 Hinsdale Street, Brooklyn have open violations?

Yes. 509 Hinsdale Street, Brooklyn had 321 open violations on September 27, 2026: 319 from HPD and 2 from OATH/ECB. 135 are Class C, the class HPD treats as immediately hazardous. The oldest open HPD violation has been open 27 years, since October 9, 1998.

Is 509 Hinsdale Street, Brooklyn getting better or worse?

New violations are coming in faster than certifications are filed. 16 new Class C against 1 certification filed 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 509 Hinsdale Street, Brooklyn?

Since September 29, 2023, a certification was filed on 1 Class C violation, 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.

Is 509 Hinsdale Street, Brooklyn in HPD's Alternative Enforcement Program?

Yes. In HPD's Alternative Enforcement Program since January 31, 2024. HPD puts a group of buildings with serious, long-running violations into the program each year. While a building is in it, HPD can make repairs itself and charge the cost to the property, and the building stays in until HPD discharges it.

Does 509 Hinsdale Street, Brooklyn have active DOB violations?

Yes. 3 active DOB violations. The newest was issued October 2, 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.

Is 509 Hinsdale Street, Brooklyn in housing court?

Yes. 1 open housing court case, opened January 15, 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 509 Hinsdale Street, Brooklyn?

Yes. 4 DOB complaints in the 12 months to September 25, 2026. The newest was filed June 17, 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 509 Hinsdale Street, Brooklyn marked completed?

Yes. 4 completed HPD emergency repair orders since September 29, 2023, awarded for $91,481 in total. The most recent of the 4, a general construction order, was opened October 20, 2025. 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.

Are any DOB work permits in effect at 509 Hinsdale Street, Brooklyn?

Yes. 1 DOB work permit in effect, for Sidewalk Shed work, issued January 30, 2026. A permit in effect allows the work it names. It does not mean the work has started or finished, or that it fixes any violation on this page.

When did 509 Hinsdale Street, Brooklyn last file its bedbug report?

On December 16, 2025, 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 509 Hinsdale 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 509 Hinsdale Street, Brooklyn built?

The city's record gives 1930 as the year 509 Hinsdale Street, 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 509 Hinsdale Street, Brooklyn have?

The Department of City Planning's PLUTO tax-lot file lists 21 residential units at 509 Hinsdale 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 HPD's Alternative Enforcement Program list, DOB violations, HPD's housing court cases, DOB complaints, the Rent Guidelines Board's stabilized-building lists, DOB NOW work permits, HPD emergency repair orders, HPD's annual bedbug reports 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 HPD's Alternative Enforcement Program list, DOB violations, HPD's housing court cases, DOB complaints, the Rent Guidelines Board's stabilized-building lists, DOB NOW work permits, HPD emergency repair orders, HPD's annual bedbug reports 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, 509 Hinsdale St, Brooklyn: 135 open Class C, from New York City's HPD violation and OATH/ECB hearing data. Figures through September 27, 2026. https://violationscout.com/building/509-hinsdale-street-brooklyn

How we count: /method.

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