Is 770 Union St rent stabilized?
770 Union St is a registered NYC rent-stabilized building in Park Slope, Brooklyn (11215). It has about 9 apartments, built in 1920.
Also written as 770 Union Street — or 770 Union St, Brooklyn, NY 11215.
How this building compares
With about 9 apartments it is larger than 67% of the 623 rent-stabilized buildings this site tracks in Park Slope. Its 1920 construction date sits close to the 1920 median for stabilized buildings tracked in the neighborhood. HPD lists 26 open violations here, about 2.9 per apartment — above the one for every 4 apartments median for tracked buildings in the neighborhood. Of the 55 violations on record at the address, 16 are class C — HPD's immediately hazardous grade. Tenants have filed 178 HPD complaints at the address, 5 of them in the last twelve months.
Building details
| Borough | Brooklyn |
| Neighborhood | Park Slope |
| ZIP | 11215 |
| Year built | 1920 |
| Apartments | 9 |
| Rent-stabilized | Yes — DHCR registered |
| Stabilization code | MULTIPLE DWELLING A |
| BBL | 3009570013 |
Owner & management
| Owner | 770 UNION STR LTD PARTNERSHIP 917 8TH AVENUE · Brooklyn, NY 11215 |
| Managing agent | KOTSONIS ORGANIZATION LLC. |
Building conditions
| HPD violations | 26 open / 55 total · 2 in last 12 mo |
| HPD complaints | 0 open / 178 total |
| HPD registration last filed | October 11, 2025 |