309 6th Avenue, Brooklyn
Co-op · 4 units · built 1940 · Block 976, Lot 7.
Building permits
No building permits on file for this lot.
Property taxes
- Assessment
- $1,225,800
- 2026–27 tax
- $19,391
- Market value (city estimate)
- $2,724,000
- Taxable value
- $208,411
- Assessed land
- $13,950
- Assessed improvements
- $1,211,850
Tax breaks
- Co-op and condo abatement, with no end date, a $6,533 credit this tax year.
Zoning
R6B: floor area ratio 2.87 built, above the 2.00 base zoning allows, which bonuses, transfers or older rules can permit.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Recent sales
- Jun 26, 2026: $2,635,000
Open-market sales since 2016, from the Department of Finance’s sales files.