342 West 21st Street, Manhattan
Co-op · 31 units · built 1940 · Block 744, Lot 63.
Building permits
- Alteration, filed Feb 14, 2024, estimated cost $51K, described as “Proposed renovation to apartments 1A & 6A. All as per plans filed herewith. No change to use, egress or occupancy.”
- Alteration, filed Aug 22, 2023, estimated cost $51K, described as “Proposed renovation to apartments 1E & 6E.”
- Alteration, filed Apr 1, 2020, estimated cost $65K, described as “Installation and relocation of plumbing fixtures as per plans filed. No change in use, occupancy or egress.”
- Alteration, filed Apr 1, 2020, estimated cost $10K, described as “Installation of ventilation systems, condenser unit and associated piping”
- Alteration, filed Aug 23, 2019, estimated cost $63K, described as “Replace bathroom and kitchen fixtures. Relocate gas stoves only in 1C, 2B, 4B, 4D, 6D.”
Property taxes
- Assessment
- $2,602,800
- 2026–27 tax
- $268,034
- Market value (city estimate)
- $5,784,000
- Taxable value
- $2,357,959
- Assessed land
- $275,400
- Assessed improvements
- $2,327,400
Tax breaks
- Co-op and condo abatement, with no end date, a $25,273 credit this tax year.
Zoning
R7B: floor area ratio 4.23 built, above the 3.00 base zoning allows, which bonuses, transfers or older rules can permit.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Recent sales
- Jul 31, 2026: $805,000
- Feb 6, 2026: $810,000
- Oct 22, 2025: $855,000
- Sep 5, 2025: $805,000
- Aug 19, 2025: $815,000
- Nov 18, 2024: $1,790,000
- Aug 29, 2024: $750,000
- Jul 30, 2024: $725,000
- May 9, 2024: $795,000
- Dec 13, 2022: $490,000
The 10 most recent of 24 open-market sales since 2016, from the Department of Finance’s sales files.