459 Union Street, Brooklyn
Two-family · built c. 1899 · Block 430, Lot 55.
Building permits
- Alteration, filed Oct 22, 2026, estimated cost $5K, described as “Filing for temporary sidewalk shed.”
- Alteration, filed Oct 22, 2026, estimated cost $5K, described as “Filing for temporary construction fence”
- Major Renovation — Residential, filed May 18, 2026, estimated cost $769K, 1 unit in all, 4 stories, described as “Proposed rear horizontal enlargement with terrace, Add a new bulkhead & stair to the roof of existing 2 story + Basement & Cellar. Convert existing 2 family to single family Replace & upgrade electrical, plumbing, mechanical & sprinklers.…”
Property taxes
- Assessment
- $136,620
- 2026–27 tax
- $5,119
- Market value (city estimate)
- $2,277,000
- Taxable value
- $25,796
- Assessed land
- $25,200
- Assessed improvements
- $111,420
Zoning
R6B: floor area ratio 0.81 built, 2.00 allowed by base zoning.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Recent sales
- Mar 19, 2026: $2,250,000, 1,696 sq ft ($1,327 per sq ft)
Open-market sales since 2016, from the Department of Finance’s sales files.