421 Hart Street, Brooklyn
Two-family · built c. 1899 · Block 1593, Lot 48.
Building permits
- Alteration, filed Jun 23, 2026, estimated cost $10K, described as “Support of Excavation in conjunction with the ALT-I application in BIS 321253558-06.”
- Alteration, filed Jun 2, 2026, estimated cost $65K, described as “Plumbing \ Sprinkler work filed in conjunction to the ALT-I application in BIS 321253558-06.”
- Alteration, filed May 8, 2020, described as “Installation of sidewalk shed as per plans. No change in use, egress or occupancy.”
- Alteration, filed May 8, 2020, described as “Installation of pipe scaffold as per plans. No change in use, egress or occupancy.”
- Alteration, filed Jan 30, 2019, estimated cost $5K, described as “Proposed installation of heavy duty sidewalk shed for remedial repairs as per plans. No change in use occupancy or egress under this application. Live load 300 per square feet. Sidewalk shed shall comply with chapter # 33 of the 2014 code”
Property taxes
- Assessment
- $65,280
- 2026–27 tax
- $2,550
- Market value (city estimate)
- $1,088,000
- Taxable value
- $12,852
- Assessed land
- $21,000
- Assessed improvements
- $44,280
Zoning
C4-4L: floor area ratio 1.08 built, 4.00 allowed by base zoning.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Recent sales
- Jan 13, 2017: $1,350,000
- Jan 13, 2017: $1,700,000
Open-market sales since 2016, from the Department of Finance’s sales files.