345 Montgomery Street, Brooklyn
Co-op · 102 units · built c. 1928 · Block 1296, Lot 64.
Building permits
- Alteration, filed May 26, 2026, described as “Installation of a suspended scaffold for Facade Inspection and repair as per plan submitted. No change to egress or occupancy.”
- Alteration, filed May 13, 2026, estimated cost $10K, described as “Installation of 300 psf sidewalk shed 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 Feb 3, 2026, estimated cost $11K, described as “Facade repair”
- Alteration, filed Aug 4, 2025, estimated cost $82K, described as “Renovation of the kitchen and bathroom. Adding one closet and modifying one closet. No change of use, egress or occupancy.”
- Alteration, filed Dec 26, 2024, estimated cost $74K, described as “Interior renovation of apartment 3C. Removal and construction of non-load bearing interior partitions,cabinetry, and finishes. No change to use, egress or occupancy. Plumbing work filed under subsequent application.”
- Alteration, filed Nov 15, 2024, estimated cost $20K, described as “Interior renovation of an apartment”
- Alteration, filed Oct 21, 2024, estimated cost $72K, described as “Interior renovation as indicated on the drawings.”
- Alteration, filed Apr 17, 2024, estimated cost $15K, described as “Interior renovation of Apt. 4J on the 4th floor. No change in use, egress or occupancy”
- Alteration, filed Sep 21, 2023, estimated cost $106K, described as “Replace existing wood sub-flooring and finish flooring on floors 2-5. Replace existing concrete slab on 1st floor and cellar ceiling.”
- Alteration, filed Jul 14, 2023, estimated cost $38K, described as “Interior renovation of apt. #4n on the 4th floor. No change in use, egress or occupancy”
- Alteration, filed Jun 14, 2023, estimated cost $356K, described as “Roof repair”
- Alteration, filed Feb 15, 2022, estimated cost $9K, described as “Proposed installation of heavy duty sidewalk shed as per plans. Live load 300 per square feet. Sidewalk shed shall comply with chapter # 33 of the 2014 code. No change in use occupancy or egress under this application.”
- Alteration, filed Aug 30, 2021, estimated cost $681K, described as “Facade Repair”
- Alteration, filed Sep 24, 2020, estimated cost $45K, described as “Structural Repairs of Bathrooms in apartments 1K,2K,2H,3H,4F,5F”
- Alteration, filed Jan 30, 2020, estimated cost $6K, described as “Filing herewith drawings to propose plumbing work inconjunction to interior renovation of existing apartment #2J. This application do not require a new or amended certificate of occupancy as there is no change in use, exists or occupancy.”
Property taxes
- Assessment
- $3,964,050
- 2026–27 tax
- $268,637
- Market value (city estimate)
- $8,809,000
- Taxable value
- $3,434,212
- Assessed land
- $373,950
- Assessed improvements
- $3,590,100
Tax breaks
- J-51 abatement, through Mar 31, 2046, a $88,357 credit this tax year.
- Co-op and condo abatement, with no end date, a $71,440 credit this tax year.
Zoning
R7-1: floor area ratio 4.45 built, above the 3.44 base zoning allows, which bonuses, transfers or older rules can permit.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Recent sales
- Jun 2, 2026: $515,000
- Jun 1, 2026: $400,000
- May 7, 2026: $575,000
- Apr 16, 2026: $425,000
- Mar 17, 2026: $80,689
- Feb 9, 2026: $460,000
- Feb 4, 2026: $450,000
- Jan 27, 2026: $680,000
- Sep 3, 2025: $645,000
- Aug 28, 2025: $692,410
The 10 most recent of 68 open-market sales since 2016, from the Department of Finance’s sales files.