450 West 23rd Street, Manhattan
Co-op · 5 units · built c. 1856 · Block 720, Lot 72.
Building permits
- Alteration, filed May 8, 2025, estimated cost $8K, described as “Proposed installation of temporary pipe scaffold as per plans. Work shall comply with chapter #33 of the NYC building code. No change in use, occupancy, or egress under this application.”
- Alteration, filed Oct 27, 2023, estimated cost $40K, described as “Rear yard renovation as shown on plans filed herewith. no change to use, egress or occupancy”
- Alteration, filed May 9, 2023, described as “Installation of heavy duty sidewalk shed and pipe scaffolding. No change in use, occupancy or egress. Work shall comply with chapter 33 of nycc.”
Property taxes
- Assessment
- $2,178,450
- 2026–27 tax
- $116,454
- Market value (city estimate)
- $4,841,000
- Taxable value
- $965,362
- Assessed land
- $468,000
- Assessed improvements
- $1,710,450
Tax breaks
- Co-op and condo abatement, with no end date, a $3,627 credit this tax year.
Zoning
R7B: floor area ratio 3.06 built, above the 3.00 base zoning allows, which bonuses, transfers or older rules can permit.
Flood zone
Current FEMA flood map: zone X, moderate risk: a 0.2% chance of flooding each year. FEMA’s preliminary map: zone AE, high risk: a 1% chance of flooding each year, base flood elevation 10 ft (NAVD88).
Recent sales
- Feb 6, 2025: $2,900,000
- Mar 20, 2023: $5,100,000
- Aug 26, 2021: $2,450,000
Open-market sales since 2016, from the Department of Finance’s sales files.
Landmarks
Part of Chelsea Historic District Extension (Historic District). 14 Landmarks Preservation Commission permits are on file.