# 6423 18th Avenue, Brooklyn

Four-family with store · built c. 1927 · Block 5547, Lot 1.

On Umarelli: https://umarelli.org/nyc/3055470001/6423-18-avenue

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

Every lot on block 5547: https://umarelli.org/nyc/brooklyn/5547.md

## Building permits

- Alteration, filed Feb 12, 2026, estimated cost $50K, described as “Application is filed for the installation of a new mechanical system and all other associated work as per plans. No change in use, egress, or occupancy”

## Property taxes

- Assessment: $782,550
- 2026–27 tax: $79,103
- Market value (city estimate): $1,739,000
- Taxable value: $635,929
- Assessed land: $86,400
- Assessed improvements: $696,150

## Zoning

C4-2: floor area ratio 2.80 built, 3.40 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