2100 Union Street, Brooklyn
Industrial · built c. 1930 · Block 3531, Lot 32.
Building permits
- Alteration, filed Jan 27, 2026, described as “Installation of temporary supported scaffold per plan submitted. Work shall comply with 2022 building codes chapter 33. No change in use, egress and/or occupancy with this application.”
- Alteration, filed Jan 27, 2026, estimated cost $5K, described as “Installation of temporary overhead protection per plan submitted. Work shall comply with 2022 building codes chapter 33. No change in use, egress and/or occupancy with this application.”
- Alteration, filed Jan 27, 2026, described as “Installation of temporary sidewalk shed per plan submitted. Work shall comply with 2022 building codes chapter 33. No change in use, egress and/or occupancy with this application.”
- Alteration, filed Jan 27, 2026, estimated cost $6K, described as “Installation of temporary personnel hoist as per plans. No change in use, egress or occupancy.”
- Major Renovation — Enlargement, filed Aug 11, 2025, estimated cost $13.9M, 96 units added, 11 stories, described as “Proposed vertical enlargment of existing commercial building to a total of 11 story mixed use building”
- Alteration, filed Feb 19, 2020, estimated cost $1K, described as “Subsequent structural application filed in conjunction with the alt 1 application 322017562”
- Alteration, filed Sep 30, 2019, estimated cost $8K, described as “Alteration type 3 - construction equipment - sidewalk-shedinstallation of temporary sidewalk shed as per plans. No change in use, egressor occupancy. Sidewalk shed shall comply with chapter #33 of the NYC buildingcode.”
Property taxes
- Assessment
- $387,450
- 2026–27 tax
- $39,600
- Market value (city estimate)
- $861,000
- Taxable value
- $365,040
- Assessed land
- $90,000
- Assessed improvements
- $297,450
Zoning
R6: floor area ratio 1.00 built, 2.43 allowed by base zoning.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Recent sales
- May 13, 2026: $600,000, 10,000 sq ft ($60 per sq ft)
- Jan 28, 2020: $2,580,000, 10,000 sq ft ($258 per sq ft)
Open-market sales since 2016, from the Department of Finance’s sales files.
In the news
Housing Lottery Launches for 2102 Union Street in Brownsville, Brooklyn, New York YIMBY, Oct 29, 2026.