# 308 23rd Street, Brooklyn

Two-family · built c. 1901 · Block 900, Lot 60.

On Umarelli: https://umarelli.org/nyc/3009000060/308-23-street

More construction in Sunset Park: https://umarelli.org/nyc/brooklyn/sunset-park.md

## Building permits

- New Building — Multi-Family, filed Nov 26, 2025, 5 units, 5 stories, described as “Propose new 5-story plus cellar residential building as per plan. Obtain new c of o.”
- Alteration, filed Dec 4, 2025, estimated cost $160, described as “Proposed 8FT construction fence. No change to use, egress or occupancy under this application.”
- Demolition, filed Sep 9, 2025, estimated cost $30K, described as “Full demolition to a two story house”

## Property taxes

- Assessment: $109,920
- 2026–27 tax: $3,190
- Market value (city estimate): $1,832,000
- Taxable value: $16,076
- Assessed land: $25,620
- Assessed improvements: $84,300

## Zoning

R6B: floor area ratio 0.49 built, 2.00 allowed by base zoning.

## Recent sales

- Sep 16, 2025: $1,570,000

Open-market sales since 2016, from the Department of Finance’s sales files.

## Flood zone

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

## In the news

[Permits Filed for 308 23rd Street in South Slope, Brooklyn](https://newyorkyimby.com/2026/03/permits-filed-for-308-23rd-street-in-south-park-slope-brooklyn.html), New York YIMBY, Mar 28, 2026.

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