681 4th Avenue, Brooklyn

Mixed use · 1 unit · built c. 1910 · Block 643, Lot 6.

Building permits

Property taxes

Assessment
$226,350
2026–27 tax
$20,844
Market value (city estimate)
$503,000
Taxable value
$192,150
Assessed land
$50,850
Assessed improvements
$175,500

Zoning

R8A: floor area ratio 1.79 built, 6.02 allowed by base zoning.

Flood zone

Current FEMA flood map: zone X, minimal flood hazard.

Recent sales

Open-market sales since 2016, from the Department of Finance’s sales files.

More construction in Sunset Park

Every lot on block 643

Umarelli: construction in New York City and Jersey City