538 Union Avenue, Brooklyn
Inside a FEMA-mapped flood zone, this condominium on Union Avenue carries 0.68 FAR of unused commercial development rights on record.
538 Union Avenue is a condominium in Brooklyn, New York City (BBL 3027417501). The property is zoned M1-2/R6A, on a 5,000 sq ft lot, with 6 floors and 20 residential units. It was built in 2013. The lot is inside a FEMA Special Flood Hazard Area.
Property facts
| BBL | 3027417501 |
|---|---|
| Borough | Brooklyn — Community District 1 |
| Neighborhood | Williamsburg |
| ZIP code | 11211 |
| Zoning district | M1-2/R6A |
| Building class | R4 — condominium (what’s a building class?) |
| Land use | 03 — Multi-family elevator buildings |
| Lot area | 5,000 sq ft |
| Floors | 6 |
| Residential units | 20 |
| Year built | 2013 |
| FAR | 1.32 built · 3 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)
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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.