420 Classon Avenue, Brooklyn
Condominium · 12 units · built c. 1899 · Block 1972, Lot 7501.
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.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
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.