# 245 21st Street, Brooklyn

Four-family · built 2025 · Block 891, Lot 75.

On Umarelli: https://umarelli.org/nyc/3008910075/245-21-street

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

## Building permits

- New Building — Multi-Family, filed Oct 20, 2021, estimated cost $214K, 4 units, 4 stories, described as “Erect a new 4 story w/ cellar residential building.”
- Alteration, filed Aug 20, 2025, estimated cost $20K, described as “Installation of 300 psf sidewalk shed and pipe scaffold as per plans. All equipment shall comply with chapter #33 of the 2022 code. No change in use, egress or occupancy under this application.”
- Alteration, filed Nov 21, 2023, estimated cost $5K, described as “Install a temporary construction fence at open space as per plan. No change in use, egress or occupancy.”
- Alteration, filed Sep 21, 2022, estimated cost $122K, described as “Structural work on cellar through roof.no change in egress, use or occupancy.”
- Alteration, filed Sep 21, 2022, estimated cost $1K, described as “Soe / exavation design to facilitate the construction of foundation.”
- Alteration, filed Aug 8, 2022, estimated cost $31K, described as “Filing for sprinkler work in conjunction with NB application #B00612705.”
- Alteration, filed Nov 11, 2021, estimated cost $30K, described as “Submit mechanical plan in conjunction with NB application #B00612705.”
- Alteration, filed Nov 11, 2021, estimated cost $5K, described as “Install a temporary construction fence at open space as plan. No change in use, egress or occupancy.”
- Alteration, filed Nov 11, 2021, estimated cost $134K, described as “Submit plumbing plan in conjunction with NB application #B00612705-I1.”

## Property taxes

- Assessment: $35,100
- 2026–27 tax: $4,366
- Market value (city estimate): $78,000
- Taxable value: $35,100
- Assessed land: $35,100

## Zoning

R6A: floor area ratio 2.80 built, 3.00 allowed by base zoning.

## Recent sales

- Nov 19, 2020: $999,999, 1,700 sq ft ($588 per sq ft)

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