5800 20th Avenue, Brooklyn
Public school · built 1965 · Block 5506, Lot 6.
Building permits
- Alteration, filed Oct 21, 2026, estimated cost $100K, described as “Mechanical work related to refrigerator and freezer. for K505. No change to occupancy, use, or egress.”
- Alteration, filed Apr 28, 2026, estimated cost $5K, described as “Installation of new sidewalk shed for hs 505K at 5800 20 avenue, brookyn in conjunction with alt# B00782651, B08003972 as indicated on plans. There will be no change in the use, egress, or occupancy under this application.”
- Alteration, filed May 12, 2025, estimated cost $455K, described as “The scope of work includes all labor, materials, and equipment necessary to complete installation of the supplemental cooling system in 1st floor auditorium.”
- Alteration, filed May 31, 2024, estimated cost $640K, described as “Installation of various heat-pump system for the cafeteria and gymnasium areas. No change in use, egress or occupancy.”
- Alteration, filed Jan 19, 2024, estimated cost $10K, described as “Ps 505K, installation of a chain link fence (+/- 213 linear feet) in conjunction with DOB # B08003972 on behalf of the contractor. No change in use, egress, or occupancy.”
- Alteration, filed Oct 26, 2023, estimated cost $198K, described as “The scope of the work includes the installation of the supplemental cooling systems for the first floor auditorium.”
- Alteration, filed Sep 20, 2023, estimated cost $25.5M, described as “Window replacement, Roof repair, Roof replacement, Face brick replacement, Partial parapet replacement and Interior finishes repair”
- Alteration, filed Jul 17, 2023, estimated cost $320K, described as “Installation of New 1000 gallons boiler feed tank station in boiler room pit in Basement”
- Alteration, filed Sep 21, 2022, estimated cost $19.5M, described as “Mechanical work related to Covid Ventilation and Climate Control upgrades”
- Alteration, filed Jul 29, 2022, estimated cost $850K, described as “K505_ New School Based Health Clinic (SBHC)_ work to include: removal of interior non-loadbearing partitions, finishes millwork, doors & finishes as required for new layouts. Provide new non-loadbearing interior partitions, doors and…”
- Alteration, filed Jun 2, 2021, described as “Installation of temporary supported scaffold per plan submitted. Work shall comply with 2014 building codes chapter 33. No change in use, egress and/or occupancy with this application.”
Property taxes
- Assessment
- $99,256,500
- Market value (city estimate)
- $220,570,000
- Taxable value
- $0
- Assessed land
- $5,534,550
- Assessed improvements
- $93,721,950
Zoning
R5: floor area ratio 3.33 built, above the 1.50 base zoning allows, which bonuses, transfers or older rules can permit.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.