309 Clarkson Avenue, Brooklyn
A 1910 mixed residential and commercial building on Clarkson Avenue with 3 residential units on record, zoned M1-1.
309 Clarkson Avenue is a mixed residential and commercial building in Brooklyn, New York City (BBL 3048280074). The property is zoned M1-1, on a 1,875 sq ft lot, with 2 floors and 3 residential units. It was built in 1910. The lot is not inside a FEMA Special Flood Hazard Area. NYC municipal records show 1 open building violation for this lot as of 2026-07-05.
Property facts
| BBL | 3048280074 |
|---|---|
| Borough | Brooklyn — Community District 9 |
| Neighborhood | Prospect Lefferts Gardens-Wingate |
| ZIP code | 11226 |
| Zoning district | M1-1 |
| Building class | S2 — mixed residential and commercial building (what’s a building class?) |
| Land use | 04 — Mixed residential & commercial buildings |
| Lot area | 1,875 sq ft |
| Floors | 2 |
| Residential units | 3 |
| Year built | 1910 |
| FAR | 0.96 built · 0 max residential · 1 max commercial Learn: What is FAR? |
| Flood zone | Not in a FEMA Special Flood Hazard Area |
Public records
- 0 open Department of Buildings violations
- 0 open ECB (OATH) violations
- 1 open Housing Preservation & Development violation
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)
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.