637 9th Avenue

A 5-story building with 50 apartments, built in 1940, in Manhattan, NY 10036.

Addresses on the lot: 637 9th Avenue, 400 West 45th Street, 402 to 404 West 45th Street.

HPD records as of October 26, 2026

20open HPD violations7 immediately hazardous

10complaints to HPD, past year2 about heat or hot water

15rent-stabilized apartmentsregistered in 2023

Nonehousing court cases in 5 yearson HPD’s record

637 9th Avenue has 20 open HPD violations, 7 of them immediately hazardous. Tenants made 10 complaints to HPD in the past year, 2 about heat or hot water. It is registered to GRANDMA-PA REALTY LTD. 15 apartments were registered as rent stabilized in 2023.

Does 637 9th Avenue have open violations?

Yes: 20 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	7
B, hazardous	30 days	8
A, non-hazardous	About 90 days	5

It has an open class C violation, as 70% of NYC buildings with 50 to 99 apartments do. More on buildings by size

Of the violations HPD wrote here in the past year, 1 has been closed.

Every violation on HPD Online ↗ · How to read HPD violations

What do tenants complain about?

Tenants made 10 complaints to HPD in the 12 months to October 26, 2026, 2 of them about heat or hot water. Complaints reach HPD through 311; an inspector may then write a violation.

Among NYC buildings with 50 to 99 apartments, 77% had at least one complaint to HPD in the past year, and 65% had one about heat or hot water.

Every complaint on HPD Online ↗ · Noise complaints go to 311, not HPD

Who owns 637 9th Avenue?

637 9th Avenue is registered with HPD to GRANDMA-PA REALTY LTD. The registration also names a head officer and a managing agent, the people HPD contacts about the building.

1 other building is registered to the same company name, with 0 open violations between them.

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, 15% of residential buildings in 10036 had a housing court case in the past five years.

Is 637 9th Avenue rent stabilized?

15 apartments were registered as rent stabilized in 2023, the same as in 2018. That’s 15 of the building’s 50 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 building

The 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

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 1-01054-0036.