505 West End Avenue, Manhattan
Co-op · 68 units · built c. 1921 · Block 1246, Lot 29.
Building permits
- Alteration, filed Aug 12, 2026, estimated cost $38K, described as “Interior alteration to partition layout, upgrade bathrooms. No change to use, occupancy or egress.”
- Alteration, filed Mar 19, 2026, estimated cost $178K, described as “Renovation of apt 2D filed in conjunction with DOB now pl. No change to use, occupancy or egress.”
- Alteration, filed Oct 10, 2025, estimated cost $109K, described as “General construction related to d-line gas riser replacement. Installation of new appliance valves in "d" apartments. No change in egress or occupancy”
- Alteration, filed Jun 4, 2025, estimated cost $141K, described as “Renovation of apt 10C filed in conjunction with DOB now pl and mh. No change to use, occupancy or egress.”
- Alteration, filed Dec 17, 2024, estimated cost $1K, described as “Mechanical work filed in conjunction with the renovation of apartment 9A. Architectural and plumbing work filed separately. No change of use, occupancy or egress.”
- Alteration, filed Dec 17, 2024, estimated cost $4K, described as “Plumbing work filed in conjunction with the renovation of apartment 9A. Architectural and mechanical work filed separately. No change of use, occupancy or egress.”
- Alteration, filed Dec 17, 2024, estimated cost $60K, described as “Renovation of apartment 9A. Architectural work as per plans. Mechanical and plumbing work filed under separate applications. No change of use, occupancy or egress.”
- Alteration, filed Jun 27, 2024, estimated cost $17K, described as “Installation of new sprinkler heads at Cellar level Laundry Room and Resident Accessory space. Connect new check valve at the base of the existing standpipe riser. No change to use, egress or occupancy.”
- Alteration, filed Aug 18, 2023, estimated cost $94K, described as “Plumbing alterations at existing laundry room and New Tenant Recreation Room at Cellar level.”
- Alteration, filed Aug 4, 2023, estimated cost $303K, described as “Cellar Level Alterations - Construct Tenant Fitness Room, Powder Room & Secondary Egress Path. Modification to existing/Installation of new HVAC equipment. Certificate of Occupancy to be amended to reflect change in use, egress & occupancy…”
- Alteration, filed May 23, 2022, estimated cost $10K, described as “(2) heat pumps with air handlers, mechanical ventilation”
- Alteration, filed Dec 14, 2021, estimated cost $114K, described as “Interior renovation to apartment #11C on 11TH floor of existing building, all as per plan. No change in egress, use or occupancy under this application.”
- Alteration, filed Dec 14, 2021, estimated cost $20K, described as “Plumbing work for interior renovation project. Replacements and new installations of wcs, lavs, tubs, showers, sinks & washers at bathrooms and kitchen. All per plan. Post approval amendment hereby filed to include location of gas meter”
- Alteration, filed Jul 15, 2020, estimated cost $2K, described as “Installation of a new through the window vent filed in conjunction with the renovation of an apartment.architectural and plumbing work filed under separate DOB applications. No change of use, occupancy or egress.”
- Alteration, filed Jul 15, 2020, estimated cost $20K, described as “Plumbing work filed in conjunction with the renovation of an existing apartment as per plans.architectural and mechanical work filed under separate applications.no change of use, occupancy.”
Property taxes
- Assessment
- $12,267,000
- 2026–27 tax
- $1,195,784
- Market value (city estimate)
- $27,260,000
- Taxable value
- $11,236,448
- Assessed land
- $1,570,500
- Assessed improvements
- $10,696,500
Tax breaks
- Co-op and condo abatement, with no end date, a $202,823 credit this tax year.
Zoning
R10A: floor area ratio 10.93 built, above the 10.00 base zoning allows, which bonuses, transfers or older rules can permit.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Recent sales
- Aug 17, 2026: $2,846,009
- Aug 12, 2026: $2,150,000
- Mar 27, 2026: $2,200,000
- Sep 20, 2024: $3,937,835
- Jul 10, 2024: $2,300,000
- Aug 3, 2023: $4,800,000
- Jun 22, 2023: $2,030,000
- Feb 10, 2022: $1,900,000
- Nov 18, 2021: $2,050,000
- Jul 28, 2021: $3,850,000
The 10 most recent of 18 open-market sales since 2016, from the Department of Finance’s sales files.
Landmarks
Part of Riverside-West End Historic District Extension I (Historic District). 34 Landmarks Preservation Commission permits are on file.