# 459 Union Street, Brooklyn

Two-family · built c. 1899 · Block 430, Lot 55.

On Umarelli: https://umarelli.org/nyc/3004300055/459-union-street

More construction in Gowanus: https://umarelli.org/nyc/brooklyn/gowanus.md

## Building permits

- Alteration, filed Oct 22, 2026, estimated cost $5K, described as “Filing for temporary sidewalk shed.”
- Alteration, filed Oct 22, 2026, estimated cost $5K, described as “Filing for temporary construction fence”
- Major Renovation — Residential, filed May 18, 2026, estimated cost $769K, 1 unit in all, 4 stories, described as “Proposed rear horizontal enlargement with terrace, Add a new bulkhead & stair to the roof of existing 2 story + Basement & Cellar. Convert existing 2 family to single family Replace & upgrade electrical, plumbing, mechanical & sprinklers.…”

## Property taxes

- Assessment: $136,620
- 2026–27 tax: $5,119
- Market value (city estimate): $2,277,000
- Taxable value: $25,796
- Assessed land: $25,200
- Assessed improvements: $111,420

## Zoning

R6B: floor area ratio 0.81 built, 2.00 allowed by base zoning.

## Recent sales

- Mar 19, 2026: $2,250,000, 1,696 sq ft ($1,327 per sq ft)

Open-market sales since 2016, from the Department of Finance’s sales files.

## 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