# 291 6th Avenue, Brooklyn

Condominium · built c. 1920 · Block 971, Lot 7501.

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On Umarelli: https://umarelli.org/nyc/3009717501/291-6-avenue

More construction in Park Slope: https://umarelli.org/nyc/brooklyn/park-slope.md

Every lot on block 971: https://umarelli.org/nyc/brooklyn/971.md

## 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.

## 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.

## Flood zone

Current FEMA flood map: zone X, minimal flood hazard.

From New York City and Jersey City public records, refreshed within a day of each release. Sources: https://umarelli.org/sources. Methodology and corrections: https://umarelli.org/methodology