# 311 West 43rd St, Manhattan

Office condominium · built c. 1925 · Block 1034, Lot 7501.

On Umarelli: https://umarelli.org/nyc/1010347501/311-west-43-st

More construction in Midtown West: https://umarelli.org/nyc/manhattan/midtown-west.md

Every lot on block 1034: https://umarelli.org/nyc/manhattan/1034.md

## Building permits

- Alteration, filed Sep 15, 2026, estimated cost $10K, described as “Application filed to indicate Commercial Occupant Protection Plan (OPP) and protection details as per plans.”
- Alteration, filed May 6, 2026, estimated cost $2.5M, described as “Application filed to convert the fourteenth (14TH) floor of the existing fifteen (15)-story commercial building to residential use as per plans”
- Alteration, filed May 27, 2025, estimated cost $9K, described as “Structural modifications taking place on cellar level as per plans filed herewith. No change in use, egress or occupancy.”
- Alteration, filed Sep 4, 2024, estimated cost $100K, described as “Install aboveground fuel oil storage tank.”
- Alteration, filed Aug 8, 2024, estimated cost $50K, described as “Remove oil tank.”
- Alteration, filed Oct 4, 2022, estimated cost $18K, described as “Sprinkler modifications taking place on 2nd, 4th and 5th floors as per plans filed herewith. No change in use, egress or occupancy.”
- Alteration, filed Oct 4, 2022, estimated cost $55K, described as “General construction modifications on the 2nd, 4th and 5th floors as per plans filed herewith. No change in use, egress or occupancy.”
- Alteration, filed Jun 15, 2022, estimated cost $5K, described as “Install new sign at building front. No change in use, egress or occupancy under this application.”
- Alteration, filed May 19, 2022, estimated cost $9K, described as “Install new and relocate sprinkler head at 1st floor and cellar. No change in use, egress or occupancy under this application.”
- Alteration, filed May 19, 2022, estimated cost $20K, described as “To file PL plumbing work at cellar floor in conjunction with dob now build application job#M00723185 . No change in use, egress or occupancy under this application.”
- Alteration, filed May 19, 2022, estimated cost $30K, described as “Modify existing mechanical duct work at cellar and 1st floor. No change in use, egress or occupancy under this application.”
- Alteration, filed Apr 27, 2022, estimated cost $30K, described as “Renovation of an existing building at cellar. No change in use, egress or occupancy under this application.”
- Alteration, filed Feb 14, 2022, estimated cost $10K, described as “To file PL plumbing work in conjunction with DOB Now Build application job#M00663597. No change in use, egress or occupancy under this application.”
- Alteration, filed Jan 24, 2022, estimated cost $30K, described as “Renovation of an existing restaurant at 1st floor. No change in use, egress or occupancy under this application.”
- Alteration, filed Jan 19, 2022, estimated cost $1K, 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 Nov 29, 2021, estimated cost $33K, described as “Filing herewith interior renovation of existing office space as per plans. No change in use, egress, or occupancy.”
- Alteration, filed Mar 12, 2021, estimated cost $25K, described as “Decommission of existing nycwin telecom site. Remove all antennas and equipment from the basement, roof and facade. No change in use, egress or occupancy. Initial installation approved under application # 110083178.”
- Alteration, filed Aug 2, 2020, estimated cost $1K, described as “Installation of temporary (20'-182') high pipe scaffold at various levels for facade repair work as per plan. No change in use egress or occupancy,pipe scaffold shall comply with CHAPTER#33 of 2014 the ny building code.”
- Alteration, filed Mar 30, 2020, described as “Installation of sidewalk shed as per plans. No change in use, egress or occupancy.”
- No Work, filed Mar 11, 2020, described as “Private event at the 5th floor (bldg is fully sprinklered), dates are 4/27, 4/28, 4/29, 4/30, 5/1, 5/18, 5/21, 5/28 & 6/4 for 7pm-11pm and 5/19 & 6/5 from 3pm-7pm with 105 occupants and 2 Fireguards.”
- Alteration, filed Mar 6, 2020, estimated cost $25K, described as “General structural changes taking place on the 7th floor as per plans filed herewith. No change in use, egress or occupancy.”
- Alteration, filed Feb 28, 2020, estimated cost $40K, described as “General plumbing changes taking place on 7th floor as per plans filed herewith. No change in use, egress or occupancy.”
- Alteration, filed Feb 28, 2020, estimated cost $75K, described as “General sprinkler changes taking place on the 7th floor as per plans filed herewith. No change in use, egress or occupancy.”
- Alteration, filed Feb 28, 2020, estimated cost $175K, described as “General mechanical changes taking place on the 7th floor as per plans filed herewith. No change in use, egress or occupancy.”
- Alteration, filed Feb 24, 2020, described as “Installation of pipe scaffold as per plans. No change in use, egress or occupancy.”

1 more, older permit is in this building’s full list on the map: https://umarelli.org/nyc/1010347501/311-west-43-st.

## Property taxes

- Assessment: $19,885,950
- 2026–27 tax: $2,142,642
- Market value (city estimate): $44,191,000
- Taxable value: $16,940,238
- Assessed land: $2,988,000
- Assessed improvements: $16,897,950
- Condo units with their own tax lots: 4

## Tax breaks

- Nonprofit exemption (charitable), with no end date, about $307,210 a year below the full tax.

## Zoning

C6-2: floor area ratio 11.96 built, above the 6.02 base zoning allows, which bonuses, transfers or older rules can permit.

## Recent sales

- Jun 18, 2026: $42,000,000, Apt 1, sold with other lots

Open-market sales since 2016, from the Department of Finance’s sales files.

## Flood zone

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

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