42 Adelphi Street, Brooklyn
Mixed use · 1 unit · built c. 1899 · Block 2031, Lot 50.
Building permits
- New Building — Residential, filed Oct 28, 2022, estimated cost $1.1M, 1 unit, 2 stories, described as “New 3-story office building”
- Alteration, filed Jul 29, 2025, estimated cost $5K, described as “Installation of 300 psf sidewalk shed and pipe scaffolding as per plans. All equipment shall comply with chapter #33 of the 2022 code. No change in use, egress or occupancy under this application.”
- Alteration, filed May 1, 2025, estimated cost $64K, described as “Install solar PV system on the existing rooftop. No changes to use, egress or occupancy.”
- Alteration, filed Jul 25, 2024, estimated cost $9K, described as “Installation of 300PSF sidewalk shed as per plans. All equipment shall comply with ch #33 of the NYC code 2022. No change in use, occupancy or egress under this application.”
- Alteration, filed Aug 10, 2022, estimated cost $25K, described as “Filing for the removal of the carport and chain link fence at the 1st floor. No change to use, egress, or occupancy.”
Property taxes
- Assessment
- $136,800
- 2026–27 tax
- $10,392
- Market value (city estimate)
- $304,000
- Taxable value
- $95,793
- Assessed land
- $136,800
Zoning
M1-2: floor area ratio 1.41 built, 2.00 allowed by base zoning.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.