# 321 21st Street, Brooklyn

Two-family · built c. 1905 · Block 892, Lot 70.

On Umarelli: https://umarelli.org/nyc/3008920070/321-21-street

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

## Building permits

- New Building — Multi-Family, filed Jun 19, 2026, 7 units, 4 stories, described as “Proposed 7-family 4-story with cellar residential building.”
- Demolition, filed Aug 25, 2026, estimated cost $25K, described as “Full demolition of existing 2-story frame residential building, existing party wall will remain in place.”
- Alteration, filed Oct 9, 2020, estimated cost $1K, described as “Installation of temporary sidewalk shed as per plans. No change in use, egress or occupancy. Sidewalk shed shall comply with chapter #33 of the NYC building code. Live load 150 psf”

## Property taxes

- Assessment: $76,920
- 2026–27 tax: $6,726
- Market value (city estimate): $1,282,000
- Taxable value: $33,895
- Assessed land: $16,500
- Assessed improvements: $60,420

## Zoning

R6B: floor area ratio 0.98 built, 2.00 allowed by base zoning.

## Flood zone

Current FEMA flood map: zone X, minimal flood hazard.

## In the news

[Permits Filed for 321 21st Street in Greenwood Heights, Brooklyn](https://newyorkyimby.com/2026/06/permits-filed-for-321-21st-street-in-greenwood-heights-brooklyn.html), New York YIMBY, Jun 22, 2026.

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