291 6th Avenue, Brooklyn
Condominium · built c. 1920 · Block 971, Lot 7501.
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Building permits
- Alteration, filed Mar 2, 2023, estimated cost $7K, described as “Install construction fence in conjunction w/ alt-co B00763748”
- Alteration, filed Nov 7, 2022, estimated cost $58K, described as “Installation of sprinkler system for entire building in conjunction alt application B00763748. No change in use, egress or occupancy.”
- Alteration, filed Nov 7, 2022, estimated cost $116K, described as “Installation of mechanical system for entire building in conjunction with alt application# B00763748. No change in use, egress or occupancy.”
- Alteration, filed Nov 7, 2022, estimated cost $54K, described as “Installation of plumbing fixture for entire building in conjunction with alt application # B00763748. No change in use, egress or occupancy.”
- Alteration, filed Jul 5, 2022, estimated cost $415K, described as “Renovation of 4 family buildingincluding rear horizontal enlargement and stair bulkhead to roof”
Zoning
R6B: floor area ratio 1.78 built, 2.00 allowed by base zoning.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Recent sales
- Sep 23, 2026: $1,450,000, Apt 3
- Aug 27, 2026: $2,300,000, Apt 1
- Jul 16, 2026: $1,700,000, Apt 2
- Apr 27, 2026: $1,496,828, Apt 4
Open-market sales since 2016, from the Department of Finance’s sales files.