5621 20 Avenue, Brooklyn
A 1931 warehouse on 20 Avenue with 2 residential units on record, zoned R5.
5621 20 Avenue is a warehouse in Brooklyn, New York City (BBL 3054950337). The property is zoned R5, on a 4,580 sq ft lot, with 3 floors and 2 residential units. It was built in 1931. The lot is not inside a FEMA Special Flood Hazard Area.
Property facts
| BBL | 3054950337 |
|---|---|
| Borough | Brooklyn — Community District 12 |
| Neighborhood | Mapleton-Midwood (West) |
| ZIP code | 11204 |
| Zoning district | R5 |
| Building class | E1 — warehouse (what’s a building class?) |
| Land use | 06 — Industrial & manufacturing |
| Lot area | 4,580 sq ft |
| Floors | 3 |
| Residential units | 2 |
| Year built | 1931 |
| FAR | 3.23 built · 1.5 max residential · 0 max commercial Learn: What is FAR? |
| Flood zone | Not 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.