# 4 West 21st Street, Manhattan

Co-op · 54 units · built 2005 · Block 822, Lot 45.

On Umarelli: https://umarelli.org/nyc/1008220045/4-west-21-street

More construction in Flatiron: https://umarelli.org/nyc/manhattan/flatiron.md

Every lot on block 822: https://umarelli.org/nyc/manhattan/822.md

## Building permits

- Alteration, filed May 16, 2023, estimated cost $275, described as “Install exterior non-illuminated wall sign (removery)”
- Alteration, filed Dec 20, 2022, estimated cost $6K, described as “Installation of mechanical units as shown on plans filed herewith.”
- Alteration, filed Dec 20, 2022, estimated cost $19K, described as “Installation, replacement and removal of pplumbing fixtures as shown on plans filed herewith.”
- Alteration, filed Dec 15, 2022, estimated cost $56K, described as “Interior renovation as shown on plans filed herewith.”
- Alteration, filed Aug 2, 2021, estimated cost $192K, described as “Alt2 for minor partitons change aps per plan filed , PL filed under seperated applicaiton , no chnage in use, egress or occupancy”
- Alteration, filed Aug 2, 2021, estimated cost $15K, described as “File PL work at apt 3AD in conjunction with OT job M00558420-”

## Property taxes

- Assessment: $18,077,400
- 2026–27 tax: $2,005,683
- Market value (city estimate): $40,172,000
- Taxable value: $17,523,380
- Assessed land: $900,000
- Assessed improvements: $17,177,400

## Tax breaks

- Co-op and condo abatement, with no end date, a $174,050 credit this tax year.

## Zoning

C6-4A: floor area ratio 12.70 built, above the 10.00 base zoning allows, which bonuses, transfers or older rules can permit.

## Recent sales

- Mar 18, 2026: $1,550,000
- Oct 30, 2025: $1,185,000
- Sep 17, 2025: $1,435,000
- Sep 4, 2025: $1,225,000
- May 5, 2025: $1,350,000
- Jul 15, 2024: $1,300,000
- Jun 28, 2024: $1,450,000
- Jun 27, 2024: $1,169,561
- May 30, 2024: $1,295,000
- May 18, 2022: $1,725,000

The 10 most recent of 35 open-market sales since 2016, from the Department of Finance’s sales files.

## Flood zone

Current FEMA flood map: zone X, minimal flood hazard.

## Landmarks

Part of Ladies' Mile Historic District (Historic District). 29 Landmarks Preservation Commission permits are on file.

## Board and land use applications

- Flatiron BID Expansion (City Planning 2021M0260): Business improvement district, Completed, filed Nov 30, 2020, decided May 19, 2021. An application from the Small Business Services (SBS) on behalf of the Flatiron Business Improvement District (BID) to modify the existing plan and expand the BID in Community Districts 4 and 5 of Manhattan.

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