511 9th Avenue, Manhattan
Condominium · 108 units · built 2008 · Block 736, Lot 7501.
Building permits
- Alteration, filed Oct 21, 2026, estimated cost $70K, described as “Installation of non-load-bearing interior partitions in the cellar. Installation of an access stair connecting the cellar and the 1st floor. No change in egress, occupancy, or use under this application.”
- Alteration, filed Aug 6, 2026, estimated cost $182K, described as “Propose to perform an interior renovation of the 1st-floor commercial space to create an eating & drinking area. The existing sprinkler, plumbing, and mechanical system shall remain intact. No change in egress, occupancy, or use under this…”
- Alteration, filed Aug 7, 2022, estimated cost $30K, described as “Plumbing work at 1ST floor, 2ND floor and 2ND floor terrace as per plans filed herewith. No change to use, egress, or occupancy.”
- Alteration, filed Aug 7, 2022, estimated cost $21K, described as “Plumbing work at 1st floor, 2nd floor and 2nd floor terrace as per plans filed herewith. No change to use, egress, or occupancy.”
- Alteration, filed Jul 20, 2022
- Alteration, filed May 13, 2022, estimated cost $165K, described as “Propose to convert existing hotel room into residential dwelling units at 2nd, 3rd and 4th floors as shown on the plans such as removal non load bearing partition & cosmetic work. Plumbing work filed separately”
- Alteration, filed Jun 3, 2021, estimated cost $25K, described as “Propose to perform an interior renovation on first floor commercial space to install eating and dining space. Existing sprinkler. plumbing fixtures and the mechanical system shall remain intact.”
Property taxes
- Assessment
- $26,080,674
- 2026–27 tax
- $2,771,267
- Market value (city estimate)
- $57,957,052
- Taxable value
- $23,555,759
- Assessed land
- $3,118,501
- Assessed improvements
- $22,962,173
- Condo units with their own tax lots
- 6
Zoning
C1-7A: floor area ratio 9.74 built, above the 6.02 base zoning allows, which bonuses, transfers or older rules can permit.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Recent sales
- Sep 1, 2026: $9,600,000, Unit HU, sold with other lots
- Oct 30, 2017: $80,500,000, Unit RU
Open-market sales since 2016, from the Department of Finance’s sales files.
Board and land use applications
- Extension to finish construction (Board of Standards and Appeals 155-12-BZY): Extension to finish construction, Granted, filed May 11, 2012, decided Aug 21, 2012. Extension of time (§11-332) to complete construction of a minor development commenced prior to a zoning text amendment related to parking. C1-7(A) Special Hudson Zoning District.