639 4th Avenue, Brooklyn
Condominium · 44 units · built 2005 · Block 637, Lot 7501.
Building permits
- Alteration, filed Oct 5, 2026, estimated cost $18K, described as “Direct replacement of Package Rooftop Unit to connect to the existing ductwork. Replacement Unit to be mounted on existing roof curb. No change in use, egress, or occupancy.”
- Alteration, filed Sep 12, 2022, estimated cost $5K, described as “Install panels on lower portion of facade”
- Alteration, filed May 23, 2021, estimated cost $3K, described as “Replacement of Gas Boiler with a new Gas Boiler in Apt. 3D on Floor 3”
- Alteration, filed Nov 22, 2020, estimated cost $6K, described as “Add new air conditioning units”
Property taxes
- Assessment
- $3,860,547
- 2026–27 tax
- $52,802
- Market value (city estimate)
- $8,579,009
- Taxable value
- $479,332
- Assessed land
- $165,599
- Assessed improvements
- $3,694,948
- Condo units with their own tax lots
- 68
Tax breaks
- 421-a exemption, through Jun 30, 2034, about $382,044 a year below the full tax.
- ICAP/ICIP exemption, through Jun 30, 2032, about $26,708 a year below the full tax.
Zoning
R8A: floor area ratio 6.20 built, above the 6.02 base zoning allows, which bonuses, transfers or older rules can permit.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Recent sales
- Nov 24, 2021: $290,000, Apt 5C
Open-market sales since 2016, from the Department of Finance’s sales files.