421 Autumn Avenue, Brooklyn
Two-family · built c. 1910 · Block 4180, Lot 18.
Building permits
- New Building — Multi-Family, filed Jul 22, 2026, 5 units, 3 stories, described as “New three (3) story five family semi-attached dwelling.”
- Major Renovation — Residential, filed Jan 19, 2026, 2 units in all, 2 stories, described as “Alteration 01, to modify lot size only”
Property taxes
- Assessment
- $71,280
- 2026–27 tax
- $8,520
- Market value (city estimate)
- $1,188,000
- Taxable value
- $42,938
- Assessed land
- $28,920
- Assessed improvements
- $42,360
Zoning
R5: floor area ratio 0.34 built, 1.50 allowed by base zoning.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.