684 Dean Street, Brooklyn
Condominium · 5 units · built 2023 · Block 1138, Lot 7503.
Building permits
- Alteration, filed Jun 30, 2025, estimated cost $2K, described as “Application filed for a temporary use permit for 2 model apartments pursuant to section ac 28-111 & buildings bulletin 2010-002. No new construction, change of use, egress, or occupancy is proposed. In conjunction with NB #321598491.”
- Alteration, filed Apr 10, 2024, described as “Installation of temporary pipe scaffold as per plans. No change in use, egress or occupancy.”
- Alteration, filed Nov 30, 2023, estimated cost $3K, described as “Application filed to install overhead protection for 680 Dean Street.”
- Alteration, filed Nov 16, 2021, described as “Installation of temporary pipe scaffold as per plans. No change in use, egress or occupancy.”
- Alteration, filed Nov 16, 2021, described as “Installation of temporary sidewalk shed as per plans. No change in use, egress or occupancy.”
- Alteration, filed Feb 23, 2021, estimated cost $1K, described as “Plumbing work as per plans filed. Filed in conjunction with NB# 321598491”
- Alteration, filed Feb 18, 2021, estimated cost $1K, described as “Mechanical work as per plans filed.”
- Alteration, filed Feb 18, 2021, estimated cost $1K, described as “Sprinkler application as per plans filed”
- Alteration, filed Feb 3, 2021, estimated cost $1K, described as “Structure filed in conjunction with NB job number 321598491. New 7-story masonry building and cellar with epicore composite floor system.”
- Alteration, filed Nov 12, 2020, estimated cost $4K, described as “Filed herewith a temporary 8' construction fence”
Property taxes
- Assessment
- $849,600
- 2026–27 tax
- $103,425
- Market value (city estimate)
- $1,888,000
- Taxable value
- $831,457
- Assessed land
- $90,901
- Assessed improvements
- $758,699
- Condo units with their own tax lots
- 5
Zoning
R6 (part of the lot is R7A): floor area ratio 3.41 built, above the 2.43 base zoning allows, which bonuses, transfers or older rules can permit.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Recent sales
- Dec 30, 2025: $2,990,000, Apt 1
- Dec 29, 2025: $2,999,999, Apt 5
- Dec 2, 2025: $1,800,000, Apt 4
Open-market sales since 2016, from the Department of Finance’s sales files.
In the news
Permits Filed for 684 Dean Street in Prospect Heights, Brooklyn, New York YIMBY, Oct 19, 2020.