# 447 West 18th Street, Manhattan

Condominium · 46 units · built 2007 · Block 716, Lot 7503.

On Umarelli: https://umarelli.org/nyc/1007167503/447-west-18-street

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

Every lot on block 716: https://umarelli.org/nyc/manhattan/716.md

## Building permits

- Alteration, filed Sep 30, 2026, estimated cost $150K, described as “At roof- extension of existing stair vestibule, replacement of existing decking, & installation of new electric hot tub & sauna.”
- Alteration, filed Nov 25, 2024, estimated cost $148K, described as “At cellar & 1ST floor lobby- interior renovation, removal and installation of non bearing interior partitions. No change to use, occupancy or egress.”
- Alteration, filed Jan 17, 2024, estimated cost $67K, described as “General construction work for interior alteration of unit 12B. No change to egress, use, or occupancy.”
- Alteration, filed Jun 30, 2023, estimated cost $200K, described as “Renovation to include minor removal and installation of non load bearing interior partitions and finishes. Replace and relocate plumbing fixtures, per schedule b under separate filing plumbing filing, no change in use, egress or occupancy.”
- Alteration, filed Jun 30, 2023, estimated cost $30K, described as “Replace, relocate and add plumbing fixtures as per schedule b and plans filed herewith.”
- Alteration, filed Jul 28, 2022
- Alteration, filed Jun 17, 2022, estimated cost $84K, described as “At 12TH floor apt 12A & roof- installation of new HVAC split heat pump system. No change to use, occupancy or egress.”
- Alteration, filed Jun 2, 2022, estimated cost $14K, described as “At 12TH floor apt 12A & roof- interior renovation,removal and installation of plumbing fixtures. No change to use, occupancy or egress.”
- Alteration, filed Feb 28, 2022, estimated cost $113K, described as “At 12TH floor apt 12A & roof- interior renovation, removal and installation of non bearing interior partitions. Install new bulkhead and vestibule over existing stair to roof. No change to use, occupancy or egress.”

## Property taxes

- Assessment: $16,302,144
- 2026–27 tax: $1,757,489
- Market value (city estimate): $36,226,997
- Taxable value: $14,126,629
- Assessed land: $543,596
- Assessed improvements: $15,758,548
- Condo units with their own tax lots: 46

## Zoning

R8A: floor area ratio 11.53 built, above the 6.02 base zoning allows, which bonuses, transfers or older rules can permit.

## Recent sales

- Jun 10, 2026: $2,325,000, Apt 7A
- Jan 30, 2026: $1,998,750, Apt GD 2
- Mar 21, 2025: $3,860,000, Apt PH12B
- Feb 11, 2025: $3,900,000, Apt 5A, sold with other lots
- Jul 10, 2024: $2,380,000, Apt 7C
- Aug 9, 2023: $2,999,999, Apt PH10B
- Apr 28, 2023: $2,350,000, Apt 6A
- Aug 11, 2022: $1,570,000, Apt 5B
- Jun 10, 2022: $2,400,000, Apt 5C
- May 3, 2022: $2,200,000, Apt 3A

The 10 most recent of 29 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 11 ft (NAVD88).

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