305 Clarkson Avenue, Brooklyn

A 1931 walk-up apartment building on Clarkson Avenue with 23 open violations on record across city enforcement files.

305 Clarkson Avenue is a walk-up apartment building in Brooklyn, New York City (BBL 3048280075). The property is zoned M1-1, on a 3,750 sq ft lot, with 3 floors and 10 residential units. It was built in 1931. The lot is not inside a FEMA Special Flood Hazard Area. NYC municipal records show 23 open building violations for this lot as of 2026-07-05.

Property facts

BBL	3048280075
Borough	Brooklyn — Community District 9
Neighborhood	Prospect Lefferts Gardens-Wingate
ZIP code	11226
Zoning district	M1-1
Building class	C7 — walk-up apartment building (what’s a building class?)
Land use	04 — Mixed residential & commercial buildings
Lot area	3,750 sq ft
Floors	3
Residential units	10
Year built	1931
FAR	2.21 built · 0 max residential · 1 max commercial Learn: What is FAR?
Flood zone	Not in a FEMA Special Flood Hazard Area

Public records

7 open Department of Buildings violations
10 open ECB (OATH) violations
6 open Housing Preservation & Development violations

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.