423 15th Street, Brooklyn
Co-op · 16 units · built c. 1909 · Block 1103, Lot 69.
Building permits
No building permits on file for this lot.
Property taxes
- Assessment
- $990,000
- 2026–27 tax
- $95,787
- Market value (city estimate)
- $2,200,000
- Taxable value
- $905,795
- Assessed land
- $62,550
- Assessed improvements
- $927,450
Tax breaks
- Co-op and condo abatement, with no end date, a $17,247 credit this tax year.
Zoning
R6B: floor area ratio 2.81 built, above the 2.00 base zoning allows, which bonuses, transfers or older rules can permit.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Recent sales
- Jul 9, 2026: $900,000
- Apr 28, 2026: $613,000
- Jan 29, 2026: $780,000
- May 8, 2025: $925,000
- Dec 19, 2024: $825,000
- Jul 25, 2024: $765,000
- Jul 20, 2023: $740,000
- Jul 21, 2022: $615,000
- Apr 29, 2021: $895,000
- Jan 20, 2021: $545,000
The 10 most recent of 16 open-market sales since 2016, from the Department of Finance’s sales files.
Landmarks
Part of Park Slope Historic District Extension (Historic District). 2 Landmarks Preservation Commission permits are on file.