# 642 Classon Avenue, Brooklyn

Three-family · built c. 1920 · Block 1141, Lot 48.

On Umarelli: https://umarelli.org/nyc/3011410048/642-classon-avenue

More construction in Crown Heights: https://umarelli.org/nyc/brooklyn/crown-heights.md

## Building permits

- Alteration, filed Sep 30, 2025, described as “Filing to install temporary sidewalk shed as per plans filed.”
- Alteration, filed Aug 13, 2025, estimated cost $2K, described as “Herewith filed for an 8 ft plywood construction fence”
- Major Renovation — Conversion, filed Sep 23, 2024, estimated cost $1.6M, 2 units added, 6 stories, described as “Proposed alt-1 for enlargement of existing 3 story 3 dwelling units and convert to a 6 story 5 dwelling units. Obtain new c of o. Proposed alt-1 required to meet new building requirements per 28-101.4.5.”

## Property taxes

- Assessment: $71,160
- 2026–27 tax: $3,375
- Market value (city estimate): $1,186,000
- Taxable value: $17,008
- Assessed land: $24,300
- Assessed improvements: $46,860

## Zoning

R6A: floor area ratio 0.93 built, 3.00 allowed by base zoning.

## Recent sales

- Apr 7, 2025: $1,550,000, sold with other lots
- Nov 9, 2021: $1,550,000

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

## Flood zone

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

## Board and land use applications

- Atlantic Avenue Mixed-Use Plan (City Planning 2022K0436): Zoning map change, Zoning text change, City property acquisition, Urban development action area, Completed, filed Oct 10, 2024, decided May 28, 2025. The Atlantic Avenue Mixed-Use Plan is an area-wide plan to support housing and job growth along Atlantic Avenue between Vanderbilt Avenue and Nostrand Avenue in Community Districts 3 and 8 within the neighborhoods of Crown Heights, Bedford…

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