2433 Knapp Street, Brooklyn

Inside a FEMA-mapped flood zone, this office building on Knapp Street carries 0.12 FAR of unused commercial development rights on record.

2433 Knapp Street is an office building in Brooklyn, New York City (BBL 3088330001). The property is zoned C3, on a 78,000 sq ft lot, with 3 floors and 1 residential units. It was built in 2019. The lot is inside a FEMA Special Flood Hazard Area. NYC municipal records show 3 open building violations for this lot as of 2026-07-05.

Property facts

BBL	3088330001
Borough	Brooklyn — Community District 15
Neighborhood	Sheepshead Bay-Manhattan Beach-Gerritsen Beach
ZIP code	11235
Zoning district	C3
Building class	O2 — office building (what’s a building class?)
Land use	05 — Commercial & office buildings
Lot area	78,000 sq ft
Floors	3
Residential units	1
Year built	2019
FAR	0.38 built · 0.75 max residential · 0.5 max commercial Learn: What is FAR?
Flood zone	In a FEMA Special Flood Hazard Area

Public records

3 open Department of Buildings violations
0 open ECB (OATH) violations
0 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.