# 80 21st Street, Brooklyn

Industrial · built c. 1920 · Block 635, Lot 100.

On Umarelli: https://umarelli.org/nyc/3006350100/80-21-street

More construction in Sunset Park: https://umarelli.org/nyc/brooklyn/sunset-park.md

Every lot on block 635: https://umarelli.org/nyc/brooklyn/635.md

## 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).

From New York City and Jersey City public records, refreshed within a day of each release. Sources: https://umarelli.org/sources. Methodology and corrections: https://umarelli.org/methodology