452 Union Street, Brooklyn
An elevator apartment building on Union Street inside a FEMA-mapped flood zone, built in 2025, zoned M1-4/R7-2.
452 Union Street is an elevator apartment building in Brooklyn, New York City (BBL 3004380007). The property is zoned M1-4/R7-2, on a 28,500 sq ft lot, with 21 floors and 160 residential units. It was built in 2025. The lot is inside a FEMA Special Flood Hazard Area.
Property facts
| BBL | 3004380007 |
|---|---|
| Borough | Brooklyn — Community District 6 |
| Neighborhood | Carroll Gardens-Cobble Hill-Gowanus-Red Hook |
| Zoning district | M1-4/R7-2 |
| Building class | D7 — elevator apartment building (what’s a building class?) |
| Land use | 04 — Mixed residential & commercial buildings |
| Lot area | 28,500 sq ft |
| Floors | 21 |
| Residential units | 160 |
| Year built | 2025 |
| FAR | 7.51 built · 3.44 max residential · 2 max commercial Learn: What is FAR? |
| Flood zone | In a FEMA Special Flood Hazard Area |
Public records
No open violations on record for this lot.
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)
Run a free lookupFree account — no card required
See plans & the one-time dossierWatch this propertyAlerts on new permits, violations & sales
Nearby on this block
Data: NYC municipal records (Departments of City Planning, Buildings, Finance) and FEMA. See our sources and methodology. Data as of 2026-07-11.