320 West 66th Street, Manhattan
Office condominium · built 1989 · Block 1171, Lot 7514.
Building permits
- Alteration, filed Jan 3, 2025, estimated cost $2.0M, described as “Filing for modifications to associated ducts and piping of existing mechanical system for fit-out of office and non-production laboratory as per plans filed herewith. No change in use, egress, or occupancy under this application.”
- Alteration, filed Dec 30, 2024, estimated cost $505K, described as “Filing for installation of water/sanitary plumbing fixtures, installation of lab gas including compressed air, vacuum, and specialty gas piping only to fixtures, ceiling utility panels and capped outlets. Sprinkler additions as per plans…”
- Alteration, filed Dec 27, 2024, estimated cost $2.6M, described as “Interior fitout of existing commercial building shell space for use as office and non-production laboratory. No change in use, egress, or occupancy in this application.”
- Alteration, filed Oct 20, 2024, estimated cost $30K, described as “Domestic water and sanitary piping for new Lab sink, vacuum piping to new outlets.”
- Alteration, filed Sep 25, 2024, estimated cost $420K, described as “Filing for installation of water/sanitary plumbing fixtures, installation of lab gas including compressed air, vacuum, and specialty gas piping only to fixtures, ceiling utility panels and capped outlets. Sprinkler additions as per plans…”
- Alteration, filed Sep 19, 2024, estimated cost $1.6M, described as “Filing for modifications to associated ducts and piping of existing mechanical system for fit-out of office and non-production laboratory as per plans filed herewith. No change in use, egress, or occupancy under this application.”
- Alteration, filed Sep 4, 2024, estimated cost $2.2M, described as “Interior fitout of existing commercial building shell space for use as office and non production laboratory. No change in use, egress, or occupancy in this application.”
- Alteration, filed Sep 22, 2023, estimated cost $7K, described as “Structural and cold-formed steel framing for support of new built-up platforms over existing reinforced concrete slabs. No change in use, egress, or occupancy.”
- Alteration, filed Sep 5, 2023, estimated cost $295K, described as “Fling for modifications associated ducts and piping of existing mechanical system for fit-out of shared space and conference rooms as per plans filed herewith. No change in use, egress, or occupancy under this application.”
- Alteration, filed Sep 5, 2023, estimated cost $2.4M, described as “Interior fit-out of the south half of L7 for lab/office use. No change in use, egress, or occupancy under this application.”
- Alteration, filed Sep 5, 2023, estimated cost $403K, described as “Filing for interior Sprinkler and Plumbing modifications as per plans filed herewith. Fit-out of half a floor for lab/office tenancy. No change in use, egress, or occupancy under this application.”
- Alteration, filed Sep 5, 2023, estimated cost $1.7M, described as “Filing for interior mechanical system additions and modifications as per plans filed herewith. Fit-out of half a floor for lab/office tenancy. No change in use, egress, or occupancy under this application.”
- Alteration, filed Sep 5, 2023, estimated cost $430K, described as “Interior fit-out of corridor and helix mezzanine, from L6.5 to Roof. No change in use, egress, or occupancy under this application.”
- Alteration, filed Sep 5, 2023, estimated cost $12K, described as “Filing for sprinkler modifications to existing system for fit-out of shared space and conference rooms as per plans filed herewith. No change in use, egress, or occupancy under this application.”
- Alteration, filed Jul 11, 2023, estimated cost $50K, described as “Filing for structural steel framing for extension of screen wall at roof as per plans filed herewith. Estimated costs included in M00427981-I1, unable to file PAA due to DOB NOW technical errors.”
- No Work, filed Jun 30, 2023, described as “Networking / Lecture event with light refreshments”
- Alteration, filed Jun 12, 2023, estimated cost $1K, described as “Propose to install non-advertising sign. No change in use, egress, or occupancy.”
- Alteration, filed Apr 21, 2023, estimated cost $125K, described as “Installation of supplemental heating/cooling units to serve corridors and an AV closet.”
- No Work, filed Jun 2, 2022
- Alteration, filed Feb 24, 2022, estimated cost $2K, described as “Storage of material / equipment on top of heavy duty sidewalk shed. Storage shall not exceed 150 psf. Shed filed under separate application. Storage shall comply with CH#33 of the NYC bc. No change in use, occupancy or egress under this…”
- Alteration, filed Feb 10, 2022, estimated cost $692K, described as “Filing for HVAC modifications as per plans filed herewith. No change to use, egress or occupancy under this application.”
- Alteration, filed Feb 10, 2022, estimated cost $72K, described as “Filing for structural modifications, specifically built-up cold formed steel platforms and framing, and miscellaneous steel for the stairs and lift as per plans filed herewith. No change to use, egress or occupancy under this application.”
- Alteration, filed Feb 10, 2022, estimated cost $3.7M, described as “Filing for HVAC modifications as per plans filed herewith. No change to use, egress or occupancy under this application.”
- Alteration, filed Feb 9, 2022, estimated cost $225K, described as “Filing for modifications to existing plumbing fixtures, sprinkler heads and standpipe system as per plans filed herewith. No change to use, egress or occupancy under this application.”
- Alteration, filed Feb 9, 2022, estimated cost $2.4M, described as “Filing for interior renovation in the Fitout of Basement Tenant Space with Conference Center as per plans filed herewith. No change to use, egress or occupancy under this application.”
26 more, older permits are in this building’s full list on the map.
Property taxes
- Assessment
- $38,517,300
- 2026–27 tax
- $3,858,944
- Market value (city estimate)
- $85,594,000
- Taxable value
- $35,572,860
- Assessed land
- $9,855,000
- Assessed improvements
- $28,662,300
- Condo units with their own tax lots
- 2
Zoning
C4-2F (part of the lot is C4-7): floor area ratio 4.79 built, 6.02 allowed by base zoning.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Recent sales
- Jul 20, 2026: $188,000,000, Apt 125UN
Open-market sales since 2016, from the Department of Finance’s sales files.
In the news
125 West End Avenue’s New Curtain Wall Nears Completion on Manhattan’s Upper West Side, New York YIMBY, Apr 5, 2022.