630 Union Street, Brooklyn
Condominium · 30 units · built c. 1909 · Block 955, Lot 7502.
Building permits
- Alteration, filed Mar 1, 2024, estimated cost $500, described as “Non-illuminated non-advertising accessory awning - 630 madeline house. No change of use, egress or occupancy.”
- Alteration, filed Jul 19, 2022, estimated cost $2K, described as “Installation of temporary overhead protection at adjacent property during bldg alteration, filed sep. Overhead protection shall comply with ch #33 of the NYC bc. No change in use, occupancy or egress under this application.”
- Alteration, filed Jun 3, 2022, estimated cost $40K, described as “Installation of temporary scaffold as per drawings. Scaffold shall comply with ch #33 of the NYC bc. No change in use, occupancy or egress under this application.”
- Alteration, filed Apr 2, 2022, estimated cost $1.7M, described as “Facade Repair and Roof Recovery Installation. Work includes exterior brickwork, pointing, terracotta, stucco and masonry coating of building main facades, and installation of roof recovery system and masonry parapet extension at roof.”
- Alteration, filed Feb 14, 2022, estimated cost $6K, described as “Installation of heavy duty sidewalk shed during bldg alteration, filed sep. Sidewalk shed shall comply with ch #33 of the NYC bc. No change in use, occupancy or egress under this application.”
Property taxes
- Assessment
- $2,074,044
- 2026–27 tax
- $210,358
- Market value (city estimate)
- $4,608,996
- Taxable value
- $1,684,518
- Assessed land
- $154,800
- Assessed improvements
- $1,919,244
- Condo units with their own tax lots
- 30
Zoning
C4-4D (part of the lot is R6A): floor area ratio 2.71 built, 6.02 allowed by base zoning.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Recent sales
- Sep 5, 2025: $534,581, Apt 1C
- Aug 5, 2025: $810,000, Apt 5B
- Oct 2, 2024: $662,500, Apt 1B
- Sep 7, 2023: $660,000, Apt 3E
- Apr 27, 2022: $550,000, Apt 2A
- Aug 20, 2018: $825,000, Apt 4B
- Apr 20, 2018: $300,000, Apt 4A
- Jan 25, 2018: $615,000, Apt 4B
- Dec 5, 2016: $560,000, Apt 1E
- Aug 15, 2016: $550,000, Apt 3D
Open-market sales since 2016, from the Department of Finance’s sales files.
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…