647 4th Avenue, Brooklyn

Apartment building · 20 units · built c. 1921 · Block 637, Lot 3.

Building permits

Property taxes

Assessment
$1,125,450
2026–27 tax
$113,720
Market value (city estimate)
$2,501,000
Taxable value
$914,220
Assessed land
$101,250
Assessed improvements
$1,024,200

Zoning

R8A: floor area ratio 3.56 built, 6.02 allowed by base zoning.

Flood zone

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

More construction in Sunset Park

Every lot on block 637

Umarelli: construction in New York City and Jersey City