498 Union Street, Brooklyn

An elevator apartment building on Union Street inside a FEMA-mapped flood zone, built in 2024, zoned M1-4/R7-2.

498 Union Street is an elevator apartment building in Brooklyn, New York City (BBL 3004390001). The property is zoned M1-4/R7-2, on a 50,625 sq ft lot, with 22 floors and 657 residential units. It was built in 2024. The lot is inside a FEMA Special Flood Hazard Area. NYC municipal records show 4 open building violations for this lot as of 2026-07-05.

Property facts

BBL	3004390001
Borough	Brooklyn — Community District 6
Neighborhood	Carroll Gardens-Cobble Hill-Gowanus-Red Hook
Zoning district	M1-4/R7-2
Building class	D7 — elevator apartment building (what’s a building class?)
Land use	04 — Mixed residential & commercial buildings
Lot area	50,625 sq ft
Floors	22
Residential units	657
Year built	2024
FAR	6.04 built · 3.44 max residential · 2 max commercial Learn: What is FAR?
Flood zone	In a FEMA Special Flood Hazard Area

Public records

3 open Department of Buildings violations
1 open ECB (OATH) violation — $10,000 in penalties due
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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Nearby on this block

Nevins Street

Data: NYC municipal records (Departments of City Planning, Buildings, Finance) and FEMA. See our sources and methodology. Data as of 2026-07-11.