4 Agate Court, Brooklyn
Two-family · built c. 1889 · Block 1871, Lot 65.
Building permits
- Alteration, filed Jul 6, 2026, estimated cost $50K, described as “Project involves changing the certificate of occupancy of an existing single-family to a 2-family. Scope of work includes interior partitions, finishes, fixtures, and rear deck and stair.”
- Alteration, filed May 21, 2021, estimated cost $132K, described as “Exisitng one family house interior renovation with new flooring, no-bearing partition wall, new painting with minor plumbing work. No mchangeof use, egres or occupancy.”
Property taxes
- Assessment
- $79,680
- 2026–27 tax
- $4,309
- Market value (city estimate)
- $1,328,000
- Taxable value
- $21,713
- Assessed land
- $16,380
- Assessed improvements
- $63,300
Zoning
R6B: floor area ratio 1.55 built, 2.00 allowed by base zoning.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Recent sales
- Mar 11, 2026: $1,740,000, 1,920 sq ft ($906 per sq ft)
- May 6, 2021: $1,051,000
Open-market sales since 2016, from the Department of Finance’s sales files.
Landmarks
Part of Alice and Agate Courts Historic District (Historic District). 3 Landmarks Preservation Commission permits are on file.