777A Union Street, Brooklyn
Two-family · built c. 1901 · Block 953, Lot 57.
Building permits
- Alteration, filed Jun 8, 2026, estimated cost $2K, described as “Proposed installation of heavy duty sidewalk shed for new building as per plans. No change in use occupancy or egress under this application. Live load 300 per square feet. Sidewalk shed shall comply with chapter # 33 of the 2022 code.”
- Alteration, filed Dec 16, 2025, estimated cost $1.1M, described as “Proposed enlargement of an existing 2-story with basement and cellar building. Convert existing 2-family into a single-family. Work in osp, cellar, basement, 1st through 3rd floor, penthouse and roof. As per plan. Obtain a new certificate…”
Property taxes
- Assessment
- $199,740
- 2026–27 tax
- $9,102
- Market value (city estimate)
- $3,329,000
- Taxable value
- $45,872
- Assessed land
- $36,960
- Assessed improvements
- $162,780
Zoning
R6A: floor area ratio 1.43 built, 3.00 allowed by base zoning.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Recent sales
- Jan 22, 2026: $2,700,000, 2,550 sq ft ($1,059 per sq ft)
Open-market sales since 2016, from the Department of Finance’s sales files.