417 Adelphi Street, Brooklyn
Single family · built 2025 · Block 1958, Lot 1.
Building permits
- New Building — Residential, filed Sep 11, 2024, 1 unit, 4 stories, described as “Proposed four (4) story, one (1) family dwelling as per plans filed herewith.”
- Alteration, filed Dec 5, 2025, estimated cost $1K, described as “Installation of temporary heavy duty sidewalk shed as per plans. No change in use, egress or occupancy. Sidewalk shed shall comply with chapter #33 of 2022 the NYC building code. Live load 300PSF.”
- Alteration, filed Jan 22, 2025, estimated cost $8K, described as “Installation of temporary construction fence filed in conjunction with GC #B01100540-I1”
Property taxes
- Assessment
- $16,800
- 2026–27 tax
- $3,334
- Market value (city estimate)
- $280,000
- Taxable value
- $16,800
- Assessed land
- $16,800
Zoning
R6B: floor area ratio 2.19 built, above the 2.00 base zoning allows, which bonuses, transfers or older rules can permit.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Recent sales
- Aug 16, 2024: $1,300,000
- Feb 8, 2024: $400,000
- Apr 11, 2022: $28,125
- Jan 25, 2021: $142,000
- Oct 17, 2018: $46,000
Open-market sales since 2016, from the Department of Finance’s sales files.