821 54th Street, Brooklyn
Two-family · built c. 1915 · Block 5665, Lot 70.
Building permits
- Alteration, filed Apr 7, 2026, estimated cost $20K, described as “Install new construction wood fence at open space.”
- Demolition, filed Jan 8, 2026, estimated cost $20K, described as “Demilition of existing detached garage at rear yard. No change in use egress or occupancy under this application.”
- Major Renovation — Enlargement, filed Aug 2, 2025, estimated cost $1.4M, 1 unit added, 4 stories, described as “Proposed horizontal and vertical enlargement on a 2 story building. Obtain new c of o.”
Property taxes
- Assessment
- $70,020
- 2026–27 tax
- $5,938
- Market value (city estimate)
- $1,167,000
- Taxable value
- $29,923
- Assessed land
- $20,040
- Assessed improvements
- $49,980
Zoning
R6: floor area ratio 0.67 built, 2.43 allowed by base zoning.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Recent sales
- May 6, 2025: $1,850,000
- Jun 6, 2024: $1,700,000
Open-market sales since 2016, from the Department of Finance’s sales files.