862 Union Street, Brooklyn
A 1923 elevator apartment building in the Park Slope Historic District historic district, on Union Street, zoned R7B.
862 Union Street is an elevator apartment building in Brooklyn, New York City (BBL 3010650027). The property is zoned R7B, on a 8,680 sq ft lot, with 6 floors and 49 residential units. It was built in 1923. The lot is not inside a FEMA Special Flood Hazard Area. NYC municipal records show 2 open building violations for this lot as of 2026-07-05.
Property facts
| BBL | 3010650027 |
|---|---|
| Borough | Brooklyn — Community District 6 |
| Neighborhood | Park Slope |
| ZIP code | 11215 |
| Zoning district | R7B |
| Building class | D1 — elevator apartment building (what’s a building class?) |
| Land use | 03 — Multi-family elevator buildings |
| Lot area | 8,680 sq ft |
| Floors | 6 |
| Residential units | 49 |
| Year built | 1923 |
| FAR | 4.07 built · 3 max residential · 0 max commercial Learn: What is FAR? |
| Historic district | Park Slope Historic District |
| Flood zone | Not in a FEMA Special Flood Hazard Area |
Public records
- 1 open Department of Buildings violation
- 0 open ECB (OATH) violations
- 1 open Housing Preservation & Development violation
- Façade safety filing status: SWARMP (latest filing 2021-10-04)
Violation counts as of 2026-07-05.
Absence of a record means none on file in NYC municipal records — not a certification of compliance.
The complete dossier also covers:
- Buildable floor area (residential & commercial)
- Recorded ownership & last sale
- Recorded mortgages & open debt stack
- LL97 carbon exposure by compliance period
- Flood coverage percentage & base flood elevation
- Climate projections for this lot
- Open permits & construction pipeline
- Distress signal convergence
- Air rights & transferable development rights
- Comparable sales (Pro)
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Data: NYC municipal records (Departments of City Planning, Buildings, Finance) and FEMA. See our sources and methodology. Data as of 2026-07-11.