# 100 South 9th Street, Brooklyn

Apartment building · 48 units · built c. 1920 · Block 2146, Lot 15.

On Umarelli: https://umarelli.org/nyc/3021460015/100-south-9-street

More construction in Williamsburg: https://umarelli.org/nyc/brooklyn/williamsburg.md

## Building permits

- Demolition, filed May 28, 2025, estimated cost $10K, described as “Full demolition of the existing two story building.”
- Alteration, filed Oct 17, 2023, estimated cost $8K, described as “Proposed installation of pipe scaffold for remedial repairs as per plans. No change in use occupancy or egress under this application.”
- Alteration, filed Oct 11, 2023, estimated cost $5K, described as “Proposed installation of heavy duty sidewalk shed for remedial repairs as per plans. No change in use occupancy or egress under this application. Live load 300 per square feet. Sidewalk shed shall comply with chapter # 33 of the 2014 code.”
- Alteration, filed Mar 30, 2023, estimated cost $74K, described as “Interior renovation on cellar first and second floor only as per plans. No change of use egress or bulk”
- Alteration, filed Feb 15, 2023, estimated cost $2K, described as “GC / ST application hereby filed in conjunction with Alt-CO NB, job number: B00755164-I1.”
- Major Renovation — Conversion, filed Jan 24, 2023, estimated cost $9.7M, 48 units added, 6 stories, described as “Proposed vertical and horizontal enlargement of an existing community facility building, converting to a six (6) story + cellar mixed-use building.”
- Alteration, filed Jun 14, 2022, estimated cost $2K, described as “Filling of construction fence as per plan, no change in use, egress or occupancy”
- Alteration, filed Jun 10, 2022, estimated cost $1K, described as “Foundation application filed in conjunction with Alt-CO NB, job number: B00755164-I1.”

## Property taxes

- Assessment: $4,558,050
- 2026–27 tax: $566,976
- Market value (city estimate): $10,129,000
- Taxable value: $4,558,050
- Assessed land: $131,850
- Assessed improvements: $4,426,200

## Zoning

R6: floor area ratio 5.14 built, above the 2.43 base zoning allows, which bonuses, transfers or older rules can permit.

## Recent sales

- Jul 25, 2022: $14,100,000, sold with other lots

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

[Housing Lottery Launches for 100 South 9th Street in South Williamsburg, Brooklyn](https://newyorkyimby.com/2026/04/housing-lottery-launches-for-100-south-9th-street-in-south-williamsburg-brooklyn.html), New York YIMBY, Apr 22, 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