# 639 4th Avenue, Brooklyn

Condominium · 44 units · built 2005 · Block 637, Lot 7501.

On Umarelli: https://umarelli.org/nyc/3006377501/639-4-avenue

More construction in Sunset Park: https://umarelli.org/nyc/brooklyn/sunset-park.md

Every lot on block 637: https://umarelli.org/nyc/brooklyn/637.md

## 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.

## Recent sales

- Nov 24, 2021: $290,000, Apt 5C

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