831 9th Avenue
An 18-story building with 149 apartments, built in 2004, in Manhattan, NY 10019.
Addresses on the lot: 400 to 420 West 55th Street.
HPD records as of October 26, 2026
831 9th Avenue has 17 open HPD violations, 1 of them immediately hazardous. Tenants made 11 complaints to HPD in the past year. It is registered to 55TH & 9TH LLC. 149 apartments were registered as rent stabilized in 2023.
Does 831 9th Avenue have open violations?
Yes: 17 open violations as of October 26, 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 | 7 |
| A, non-hazardous | About 90 days | 9 |
It has an open class C violation, as 56% of NYC buildings with 100 or more apartments do. More on buildings by size
Of the violations HPD wrote here in the past year, 3 have been closed.
Every violation on HPD Online ↗ · How to read HPD violations
What do tenants complain about?
Tenants made 11 complaints to HPD in the 12 months to October 26, 2026, none 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 831 9th Avenue?
831 9th Avenue is registered with HPD to 55TH & 9TH 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 no evictions here in the five years to May 30, 2026.
For comparison, 21% of residential buildings in 10019 had a housing court case in the past five years.
Is 831 9th Avenue rent stabilized?
149 apartments were registered as rent stabilized in 2023, the same as in 2018. That’s 149 of the building’s 149 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
- 411 West 54th Street72 apartments, built 1910
- 415 West 55th Street22 apartments, built 1911
- 419 West 55th Street24 apartments, built 1911
- 857 9th Avenue22 apartments, built 1901
- 404 West 56th Street24 apartments, built 1901
- 421 West 54th Street27 apartments, built 1928
HPD violations, complaints, registrations and housing court cases as of October 26, 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 1-01064-0036.