# 435 East 21st Street, Brooklyn

Single family · built c. 1899 · Block 5164, Lot 62.

On Umarelli: https://umarelli.org/nyc/3051640062/435-east-21-street

More construction in Flatbush: https://umarelli.org/nyc/brooklyn/flatbush.md

## Building permits

- New Building — Multi-Family, filed May 9, 2024, 16 units, 6 stories, described as “NB application- 16 family 6 story with cellar residential”
- Alteration, filed Apr 7, 2026, estimated cost $3K, described as “Engineered Enclosure to be installed on supported scaffold as shown on drawings in conjunction with NB# B01043157 .”
- Alteration, filed Aug 24, 2025, estimated cost $5K, described as “Installation of outrigger beams (needle beams) to support scaffold & roof protection as shown on drawings. No change in use, egress or occupancy. We shall comply with chapter 33 of 2022 b.c”
- Alteration, filed Aug 24, 2025, described as “Installation of sidewalk shed and supported scaffold as shown on drawings. No change in use egress or occupancy. We shall comply with chapter 33 of 202 b.c”
- Demolition, filed Apr 23, 2024, estimated cost $20K, described as “Full demolition of existing 2 story frame with cellar”
- Demolition, filed Mar 27, 2024, estimated cost $2K, described as “Full demolition of existing detached 1 story garage.”

## Property taxes

- Assessment: $144,060
- 2026–27 tax: $6,654
- Market value (city estimate): $2,401,000
- Taxable value: $33,535
- Assessed land: $27,660
- Assessed improvements: $116,400

## Zoning

R6A: floor area ratio 0.82 built, 3.00 allowed by base zoning.

## Recent sales

- Apr 18, 2024: $997,000

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 435 East 21st Street in Ditmas Park, Brooklyn](https://newyorkyimby.com/2024/05/permits-filed-for-435-east-21st-street-in-ditmas-park-brooklyn.html), New York YIMBY, May 13, 2024.

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