390 Union Avenue, Brooklyn
Three-family · built c. 1899 · Block 2773, Lot 6.
Building permits
- Alteration, filed Jun 24, 2026, estimated cost $5K, described as “Installation of 300 psf sidewalk shed as per plans. All equipment shall comply with chapter #33 of the 2022 code. No change in use, egress or occupancy under this application.”
- Major Renovation — Enlargement, filed May 16, 2025, estimated cost $1.5M, 6 units added, 4 stories, described as “Proposed vertical & horizontal enlargement and interior renovations to existing 3-story and cellar residential building, proposed addition of one story and penthouse, total of 9 units.”
Property taxes
- Assessment
- $125,760
- 2026–27 tax
- $5,689
- Market value (city estimate)
- $2,096,000
- Taxable value
- $28,672
- Assessed land
- $24,960
- Assessed improvements
- $100,800
Zoning
R7A: floor area ratio 1.15 built, 4.00 allowed by base zoning.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Recent sales
- Apr 28, 2025: $2,450,000
- Aug 9, 2017: $2,399,888
Open-market sales since 2016, from the Department of Finance’s sales files.