270 20th Street, Brooklyn
Three-family · built c. 1899 · Block 891, Lot 23.
Building permits
- New Building — Multi-Family, filed Mar 18, 2026, 10 units, 5 stories, described as “Proposed 5 story residential new building. Formation of new zoning lot with adjacent tax lot 21”
- Alteration, filed May 12, 2026, estimated cost $160, described as “Proposed construction fence. No change to use, egress or occupancy under this application.”
- Demolition, filed Jul 23, 2025, estimated cost $1K, described as “Full demolition to a three story house”
Property taxes
- Assessment
- $123,180
- 2026–27 tax
- $5,545
- Market value (city estimate)
- $2,053,000
- Taxable value
- $27,946
- Assessed land
- $20,940
- Assessed improvements
- $102,240
Zoning
R6B: floor area ratio 0.77 built, 2.00 allowed by base zoning.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Recent sales
- Jun 25, 2019: $1,700,000
Open-market sales since 2016, from the Department of Finance’s sales files.