399 Flatbush Avenue, Brooklyn

A 1910 condominium on Flatbush Avenue carrying 4.52 FAR of unused residential development rights on record under its R8X zoning.

399 Flatbush Avenue is a condominium in Brooklyn, New York City (BBL 3011697502). The property is zoned R8X, on a 5,192 sq ft lot, with 4 floors and 5 residential units. It was built in 1910. The lot is not inside a FEMA Special Flood Hazard Area. NYC municipal records show 32 open building violations for this lot as of 2026-07-05.

Property facts

BBL	3011697502
Borough	Brooklyn — Community District 8
Neighborhood	Park Slope
ZIP code	11238
Zoning district	R8X
Building class	RM — condominium (what’s a building class?)
Land use	04 — Mixed residential & commercial buildings
Lot area	5,192 sq ft
Floors	4
Residential units	5
Year built	1910
FAR	1.5 built · 6.02 max residential · 0 max commercial Learn: What is FAR?
Flood zone	Not in a FEMA Special Flood Hazard Area

Public records

11 open Department of Buildings violations
6 open ECB (OATH) violations — $3,971 in penalties due
15 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.