# 604 Union Street, Brooklyn

Commercial · built 1941 · Block 441, Lot 21.

On Umarelli: https://umarelli.org/nyc/3004410021/604-union-street

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

## Building permits

- New Building — Large Residential, filed May 21, 2026, 85 units, 9 stories, early work permitted while the building plans are in review, described as “(please assign to dev hub) proposed new 9 story and cellar mixed use building”
- Alteration, filed Aug 27, 2026, estimated cost $4K, described as “Installation of overhead protection as per plans. All equipment shall comply with chapter #33 of the NYC building code 2022. No change in use, occupancy, or egress under this application.”
- Demolition, filed Jun 3, 2026, estimated cost $10K, described as “Full demolition of a one (1) story with cellar building.”

## Property taxes

- Assessment: $993,600
- 2026–27 tax: $107,678
- Market value (city estimate): $2,208,000
- Taxable value: $992,610
- Assessed land: $229,500
- Assessed improvements: $764,100

## Zoning

M1-4/R7A: floor area ratio 1.00 built, 4.00 allowed by base zoning.

## Recent sales

- Jul 8, 2026: $11,000,000, 8,550 sq ft ($1,287 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.

## Board and land use applications

- Gowanus Neighborhood Plan (City Planning 2018K0382): Zoning map change, Zoning text change, City map change, Urban development action area, Completed, decided Dec 6, 2021. The Gowanus Neighborhood Plan is a shared, long-term vision for a thriving neighborhood. It looks to identify strategies for an equitable, resilient and sustainable Gowanus, with more local jobs and housing. The Plan supports community…

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