511 9th Avenue
A 12-story building with 108 apartments, built in 2008, in Manhattan, NY 10018.
Addresses on the lot: 511 to 521 9th Avenue.
HPD records as of November 1, 2026
511 9th Avenue has 9 open HPD violations, 1 of them immediately hazardous. Tenants made 18 complaints to HPD in the past year, 3 about heat or hot water. It is registered to 515 NINTH HOLDINGS LLC. 28 apartments were registered as rent stabilized in 2023.
Does 511 9th Avenue have open violations?
Yes: 9 open violations as of November 1, 2026. HPD sorts them by how soon the owner must fix them:
| Class | Deadline | Open |
|---|---|---|
| C, immediately hazardous | 24 hours for most | 1 |
| B, hazardous | 30 days | 5 |
| A, non-hazardous | About 90 days | 3 |
It has an open class C violation, as 56% of NYC buildings with 100 or more apartments do. More on buildings by size
Every violation on HPD Online ↗ · How to read HPD violations
What do tenants complain about?
Tenants made 18 complaints to HPD in the 12 months to November 1, 2026, 3 of them about heat or hot water. Complaints reach HPD through 311; an inspector may then write a violation.
Among NYC buildings with 100 or more apartments, 72% had at least one complaint to HPD in the past year, and 57% had one about heat or hot water.
Every complaint on HPD Online ↗ · Noise complaints go to 311, not HPD
Who owns 511 9th Avenue?
511 9th Avenue is registered with HPD to 515 NINTH HOLDINGS LLC. The registration also names a head officer and a managing agent, the people HPD contacts about the building.
The registration on HPD Online ↗ · The owner’s other buildings, on Who Owns What ↗ · Deeds and mortgages (ACRIS) ↗ · How to find who owns a building
Housing court and evictions
HPD’s record shows no housing court cases over conditions or harassment at this building.
City marshals carried out 3 evictions here in the five years to May 30, 2026.
For comparison, 18% of residential buildings in 10018 had a housing court case in the past five years.
Is 511 9th Avenue rent stabilized?
28 apartments were registered as rent stabilized in 2023, down from 108 in 2018. That’s 28 of the building’s 108 apartments. Whether one apartment is stabilized is in its rent history, which the tenant can ask the state for.
How to check if an apartment is rent stabilized
Scores out of ten, from today’s records
Score this buildingThe address check reads the latest complaints and violations and scores the building, the landlord, the noise on the block and the walk to the subway. On a StreetEasy listing, the Chrome extension adds light for the floor and value for the rent.
Buildings nearby
- 510 9th Avenue22 apartments, built 1920
- 407 West 39th Street30 apartments, built 1900
- 506 9th Avenue44 apartments, built 1920
- 502 9th Avenue36 apartments, built 2005
- 351 West 38th Street374 apartments, built 2017
- 344 West 38th Street23 apartments, built 1915
HPD violations, complaints, registrations and housing court cases as of November 1, 2026; evictions and rent-stabilized counts as of May 30, 2026; size and age from the city’s PLUTO. All from NYC Open Data. Public records, not legal advice. Tax lot 1-00736-7501.