Is 423 Lenox Ave rent stabilized?
423 Lenox Ave is a registered NYC rent-stabilized building in Harlem (North), Manhattan (10037). It has about 9 apartments, built in 1910.
Also written as 423 Lenox Avenue — or 423 Lenox Ave, Manhattan, NY 10037.
How this building compares
With about 9 apartments it is smaller than 75% of the 734 rent-stabilized buildings this site tracks in Harlem (North). HPD lists 1 open violation here, about one for every 9 apartments — below the 0.9 per apartment median for tracked buildings in the neighborhood. Of the 20 violations on record at the address, 4 are class C — HPD's immediately hazardous grade, and none of them are still open. HPD issued 5 new violations at the address in the last twelve months. Tenants have filed 64 HPD complaints at the address, none of them in the last twelve months.
Building details
| Borough | Manhattan |
| Neighborhood | Harlem (North) |
| ZIP | 10037 |
| Year built | 1910 |
| Apartments | 9 |
| Rent-stabilized | Yes — DHCR registered |
| Stabilization code | MULTIPLE DWELLING A |
| BBL | 1019160030 |
Owner & management
| Owner | ABJ SIERRA LLC 11 GRACE AVENUE #405 · Great Neck, NY 11021 |
| Managing agent | ABJ SIERRA LLC |
Building conditions
| HPD violations | 1 open / 20 total · 5 in last 12 mo |
| HPD complaints | 1 open / 64 total |
| HPD registration last filed | October 15, 2025 |
Full building report — $9
Frequently asked questions
Is 423 Lenox Ave rent stabilized?
423 Lenox Ave in Harlem (North), Manhattan is registered as rent stabilized in the New York State DHCR 2024 rent-stabilized building files, where its stabilization code is MULTIPLE DWELLING A. Registration is recorded for the building, not for each apartment in it, so an individual unit here can still have been deregulated — ask the landlord or DHCR for that apartment's rent history before relying on it.
How many apartments are at 423 Lenox Ave?
423 Lenox Ave (BBL 1019160030) has about 9 residential apartments and was built in 1910, from NYC PLUTO. PLUTO counts the building's units; it does not say how many of them are rent stabilized.