# 5806 21st Avenue, Brooklyn

Four-family · built c. 1931 · Block 5507, Lot 38.

On Umarelli: https://umarelli.org/nyc/3055070038/5806-21-avenue

More construction in Borough Park: https://umarelli.org/nyc/brooklyn/borough-park.md

Every lot on block 5507: https://umarelli.org/nyc/brooklyn/5507.md

## Building permits

- Alteration, filed Aug 15, 2025, estimated cost $9K, described as “Plumbing work as per plan.”
- Alteration, filed May 27, 2025, estimated cost $12K, described as “Proposed installation of temporary pipe scaffold as per plans. Work shall comply with chapter #33 of the NYC building code. No change in use, occupancy, or egress under this application.”
- Alteration, filed May 27, 2025, estimated cost $5K, described as “Proposed installation of heavy duty sidewalk shed as per plans. Live load 300 lbs per square feet. Sidewalk shed shall comply with chapter #33 of the NYC building code. No change in use, occupancy, or egress under this application.”
- Alteration, filed Jun 17, 2024, estimated cost $808K, described as “Adding a new story to an existing 2 story, 4 family dwelling. Work as per plan.”
- Alteration, filed May 29, 2024, estimated cost $242K, described as “Interior removal, work only. No change of bulk, egress or use.”

## Property taxes

- Assessment: $398,250
- 2026–27 tax: $14,712
- Market value (city estimate): $885,000
- Taxable value: $118,275
- Assessed land: $95,400
- Assessed improvements: $302,850

## Zoning

R5: floor area ratio 1.32 built, 1.50 allowed by base zoning.

## Flood zone

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

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