645 Carroll Street, Brooklyn
Three-family · built c. 1899 · Block 959, Lot 69.
Building permits
- Alteration, filed Nov 5, 2026, estimated cost $806K, described as “Conversion of an existing 3-story with basement and cellar 3 family dwelling into a 2 family dwelling.new layout as shown on plans.obtain new c. Of o.”
- Alteration, filed Apr 2, 2025, estimated cost $11K, described as “Repair/replace wood deck boards on existing foundation”
- Alteration, filed May 8, 2024, estimated cost $73K, described as “New laundry room at basement level and replace gypsum throughout.”
Property taxes
- Assessment
- $253,380
- 2026–27 tax
- $9,919
- Market value (city estimate)
- $4,223,000
- Taxable value
- $49,985
- Assessed land
- $32,880
- Assessed improvements
- $220,500
Zoning
R6B: floor area ratio 1.77 built, 2.00 allowed by base zoning.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Recent sales
- Aug 3, 2026: $4,250,000, 3,060 sq ft ($1,389 per sq ft)
- Aug 31, 2023: $2,900,000
- May 17, 2022: $2,600,000
Open-market sales since 2016, from the Department of Finance’s sales files.