# 420 Classon Avenue, Brooklyn

Condominium · 12 units · built c. 1899 · Block 1972, Lot 7501.

On Umarelli: https://umarelli.org/nyc/3019727501/420-classon-avenue

More construction in Clinton Hill: https://umarelli.org/nyc/brooklyn/clinton-hill.md

Every lot on block 1972: https://umarelli.org/nyc/brooklyn/1972.md

## Building permits

- Alteration, filed May 12, 2022, estimated cost $15K, described as “Proposed installation of a temporary sidewalk shed as per plans submitted. Work shall comply with 2014 building codes, chapter 33.No change i use, egress or occupancy.”
- Alteration, filed Nov 9, 2021, estimated cost $10K, described as “Alt 2 filing for roof and railing repairs at building main roof. Stair/ stoop repairs at front entry. No change in use, egress or occupancy”

## Property taxes

- Assessment: $910,800
- Market value (city estimate): $2,024,001
- Taxable value: $112,811
- Assessed land: $90,001
- Assessed improvements: $820,799
- Condo units with their own tax lots: 12

## Tax breaks

- J-51 exemption, through Jun 30, 2043, about $94,180 a year below the full tax.

## Zoning

R6B: floor area ratio 1.93 built, 2.00 allowed by base zoning.

## Recent sales

- Jan 30, 2026: $1,200,000, Unit A
- Aug 14, 2025: $1,350,000, Unit C
- Aug 28, 2023: $1,150,000, Apt 2B
- Jul 25, 2017: $895,000, Apt 2B
- Jun 9, 2016: $650,000, Apt 1B
- May 2, 2016: $582,000, Apt 2A

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