# 420 West 23rd Street, Manhattan

Condominium · 38 units · built 1985 · Block 720, Lot 7501.

On Umarelli: https://umarelli.org/nyc/1007207501/420-west-23-street

More construction in Chelsea: https://umarelli.org/nyc/manhattan/chelsea.md

Every lot on block 720: https://umarelli.org/nyc/manhattan/720.md

## Building permits

- Alteration, filed May 23, 2026, described as “Material hoist. For materials only. No work from hoist.”
- Alteration, filed Sep 14, 2022, estimated cost $43K, described as “Modification to existing Verizon site. Replace 10 antennas & 8 RRHs and install 4 antennas & 4 GPS units on the roof. Replace 2 cabinets and install 1 cabinet on an existing platform on the roof.”
- Alteration, filed Sep 14, 2022, estimated cost $40K, described as “Remove existing non-emergency DC generator and associate mounting hardware on the roof.”
- Alteration, filed Sep 14, 2022, estimated cost $10K, described as “Removal of existing gas piping from cellar to OSP to roof and removal of existing meter from cellar as per plans. No change in use, egress, or occupancy.”
- Alteration, filed May 10, 2022, estimated cost $20K, described as “Replacement of antennas on the rooftop (AT&T - 11592402) as per plans. All work is in compliance with TPPN 5/98 & BB 11/21. No change to use, egress or occupancy.”
- Alteration, filed Apr 1, 2022, estimated cost $8K, described as “Plumbing work filed in conjuction with interior renovation of apartment 2D as per plans filed herewith. No change in use, egress or occupancy”
- Alteration, filed Apr 1, 2022, estimated cost $25K, described as “Interior renovation of existing kitchen in unit 2D as per plans filed herewith. No change in use, egress or occupancy.”
- Alteration, filed Mar 1, 2022, estimated cost $8K, described as “Plumbing work related to the renovation of kitchen and bathroom in apartment #11B on the 11th floor. No change to use, egress or occupancy.”
- Alteration, filed Mar 1, 2022, estimated cost $96K, described as “Renovation of existing apartment (#11B) on the 11th floor. No change to use, egress or occupancy.”
- Alteration, filed May 5, 2020, estimated cost $87K, described as “AT&T - Installation of steel platform, cabinets, and new antenna sectors with related appurtenances on roof. Installation of related utilities as per plans. All work is in compliance with TPPN 5/98. No change to occupancy, use, or egress.”
- Alteration, filed May 5, 2020, estimated cost $15K, described as “Installation of gas meter and gas piping as per plans. No change to occupancy, use, or egress.”
- Alteration, filed May 5, 2020, estimated cost $50K, described as “Installation of non-emergency gas fired generator with related gas booster pump on steel platform on roof. Extension of existing vent fan ductwork on roof per plans. No change to occupancy, use, or egress.”

## Property taxes

- Assessment: $8,156,706
- 2026–27 tax: $709,493
- Market value (city estimate): $18,126,010
- Taxable value: $7,051,121
- Assessed land: $561,152
- Assessed improvements: $7,595,554
- Condo units with their own tax lots: 45

## Tax breaks

- Co-op and condo abatement, with no end date, a $90,142 credit this tax year.

## Zoning

R7B: floor area ratio 5.05 built, above the 3.00 base zoning allows, which bonuses, transfers or older rules can permit.

## Recent sales

- Jul 6, 2026: $1,375,000, Apt 9A
- May 6, 2026: $937,500, Apt 9B
- Apr 28, 2026: $550,000, Apt 3A
- Apr 8, 2026: $1,600,000, Apt 1FB, sold with other lots
- Jul 10, 2023: $1,525,000, Apt 8D
- Dec 12, 2022: $1,050,000, Apt 2A
- Dec 6, 2021: $1,625,000, Apt 5D
- Jul 23, 2021: $833,000, Apt 11B
- Jun 3, 2021: $975,000, Apt 6A
- Feb 19, 2021: $760,000, Apt 7B

The 10 most recent of 18 open-market sales since 2016, from the Department of Finance’s sales files.

## Flood zone

Current FEMA flood map: zone X, minimal flood hazard. FEMA’s preliminary map: zone AE, high risk: a 1% chance of flooding each year, base flood elevation 10 ft (NAVD88).

## Board and land use applications

- THE FLAMINGO ROOM (City Planning P2002M0657): Completed, decided Jul 30, 2003. NEW-ENCLOSED SIDEWALK CAFE, WITH 51 SEATS

From New York City and Jersey City public records, refreshed within a day of each release. Sources: https://umarelli.org/sources. Methodology and corrections: https://umarelli.org/methodology