80 21st Street, Brooklyn
Industrial · built c. 1920 · Block 635, Lot 100.
Building permits
- Alteration, filed Jan 15, 2026, estimated cost $150K, described as “Mechanical modifications to include HVAC replacement and replacement of associated ductwork. No change of use, occupancy or egress”
- Alteration, filed Jan 28, 2020, estimated cost $23K, described as “Modifications to existing dry standpipe/sprinkler system.”
Property taxes
- Assessment
- $2,969,100
- 2026–27 tax
- $273,994
- Market value (city estimate)
- $6,598,000
- Taxable value
- $2,525,760
- Assessed land
- $807,750
- Assessed improvements
- $2,161,350
Zoning
M3-1: floor area ratio 0.71 built, 2.00 allowed by base zoning.
Flood zone
Current FEMA flood map: zone AE, high risk: a 1% chance of flooding each year, base flood elevation 10 ft (NGVD29). FEMA’s preliminary map: zone AE, high risk: a 1% chance of flooding each year, base flood elevation 13 ft (NAVD88).