# 347 Warren Street, Brooklyn

Three-family · built c. 1899 · Block 391, Lot 54.

On Umarelli: https://umarelli.org/nyc/3003910054/347-warren-street

More construction in Boerum Hill: https://umarelli.org/nyc/brooklyn/boerum-hill.md

## Building permits

- Alteration, filed Aug 31, 2026, estimated cost $1K, described as “Proposed horizontal and vertical enlargement of existing three-story & basement, three-family building, with renovation throughout as per plans. No change in use, egress, or occupancy.”
- Major Renovation — Conversion, filed Mar 10, 2025, 1 unit added, 4 stories, described as “Application is filed for a conversion from 3 family to 4 family with a vertical and horizontal extension. Obtain new certificate of occupancy.”

## Property taxes

- Assessment: $211,260
- 2026–27 tax: $8,190
- Market value (city estimate): $3,521,000
- Taxable value: $41,275
- Assessed land: $29,700
- Assessed improvements: $181,560

## Zoning

R6B: floor area ratio 1.21 built, 2.00 allowed by base zoning.

## Recent sales

- Dec 30, 2024: $2,500,026
- Dec 5, 2023: $1,965,000

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