1678 Union Street, Brooklyn
Apartment building · 20 units · built c. 1916 · Block 1402, Lot 21.
Building permits
- Alteration, filed Aug 23, 2018, estimated cost $5K, described as “Installation of a heavy duty sidewalk shed approximately 78'LONG as per plans in conjunction with facade repairs. No change in use, egress or occupancy. Sidewalk shed shall comply with 2014 NYC building code, chapter 33.”
Property taxes
- Assessment
- $1,606,950
- 2026–27 tax
- $176,782
- Market value (city estimate)
- $3,571,000
- Taxable value
- $1,421,190
- Assessed land
- $37,800
- Assessed improvements
- $1,569,150
Zoning
R4: floor area ratio 2.70 built, above the 1.00 base zoning allows, which bonuses, transfers or older rules can permit.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Recent sales
- Jun 23, 2026: $57,000,000, 18,720 sq ft, sold with other lots
Open-market sales since 2016, from the Department of Finance’s sales files.