51 5th Avenue, Manhattan
Co-op · 89 units · built c. 1929 · Block 569, Lot 5.
Building permits
- Alteration, filed Oct 8, 2026, estimated cost $33K, described as “Interior demolition and construction for renovation on Apt 7F on 7th floor”
- Alteration, filed Jun 5, 2026, estimated cost $20K, described as “Filing for installation of (2) Mini Split Air Conditioning unit systems serving the 2nd floor. No change in egress, use or occupancy. This application supersedes expired application # M00838234-I1.”
- Alteration, filed Oct 14, 2025, estimated cost $41K, described as “Structural work for the new openings in the existing masonry walls for HVAC units.”
- Alteration, filed Sep 19, 2025, estimated cost $42K, described as “Renovation of an existing dwelling unit. Architectural work as per plans. No change of use, occupancy or egress.”
- Alteration, filed Jun 27, 2025, estimated cost $3K, described as “Installation of a temporarily supported scaffold per plan submitted. Work shall comply with 2022 building codes chapter 33. No change in use, egress and/or occupancy with this application.”
- Alteration, filed Jul 11, 2024, estimated cost $3K, described as “Installation of a temporarily supported scaffold per plan submitted. Work shall comply with 2022 building codes chapter 33. No change in use, egress and/or occupancy with this application.”
- Alteration, filed Jun 19, 2024, estimated cost $3K, described as “Installation of a temporarily heavy-duty sidewalk shed per plan submitted. Work shall comply with 2022 building codes chapter 33. No change in use, egress and/or occupancy with this application.”
- Alteration, filed Jun 6, 2024, described as “Installation of suspended scaffold for facade work or inspection”
- Alteration, filed May 7, 2024, estimated cost $60K, described as “Plumbing filing in support of interior renovations to existing dwelling unit in multiple dwellingresidential buildling.”
- Alteration, filed May 6, 2024, estimated cost $500K, described as “Filing for interior renovations to apartment 10BF. Removal and installation of non-loading bearing partitions, doors, plumbing fixtures,and related general construction as shown on drawings filed herewith.no change in use, egress or…”
- Alteration, filed Feb 27, 2024, estimated cost $415K, described as “Exterior renovations consisting of brick replacement, cutting and pointing, window sill & lintel replacement and stone repair as per plans filed herewith. No change to use, egress or occupancy”
- Alteration, filed Jan 29, 2024, estimated cost $60K, described as “Filing for interior renovations of apartment 17A. No change in use, egress or occupancy.”
- Alteration, filed Jan 29, 2024, estimated cost $23K, described as “Filing for plumbing renovations to unit 17A as per plans. No change of use, egress or occupancy.”
- Alteration, filed Nov 17, 2023, estimated cost $20K, described as “Filing for installation to two a/c units on the 2nd floor. No change in egress, use or occupancy.”
- Alteration, filed Aug 25, 2022, estimated cost $46K, described as “Renovation of apartment #14E;minor opening in non-loadbearing partition; renovation of existing kitchen and bathroom ; new two through wall ac units no change to use, egress or occupancy.”
- Alteration, filed Aug 25, 2022, estimated cost $9K, described as “Proposed bathroom fixtures replacement in the bathroom and kitchen.no change in use ,occupancy and means of egress.”
- Alteration, filed Jun 8, 2022, estimated cost $60K, described as “Interior renovation of apartment 4A-4BF on the 4TH floor. No change in use, egress or occupancy.”
- Alteration, filed Jun 8, 2022, estimated cost $10K, described as “Plumbing work related to the interior renovation of apartment 4A-4BF on the 4TH floor. No change in use, egress or occupancy.”
- Alteration, filed May 19, 2021, estimated cost $5K, described as “New masonry openings for new thru-wall ac units and exhaust vent, as per plans filed herewith. No change in use, egress or occupancy.”
- Alteration, filed May 12, 2021, estimated cost $112K, described as “Interior renovation to existing co-op apartment #8C. Work to include interior demolition, general construction and related finishes. No change in use, egress or occupancy.”
- Alteration, filed Dec 11, 2020, estimated cost $8K, described as “Replacement of plumbing fixtures; no change to use, egress or occupancy.”
- Alteration, filed Dec 11, 2020, estimated cost $12K, described as “Installation of through-the-wall HVAC units; no change to use, egress or occupancy.”
- Alteration, filed Jun 4, 2020, estimated cost $22K, described as “Application to remove existing plumbing fixtures and to install new plumbing fixtures. Related alteration 2 "ot" job number is 140905974.”
- Alteration, filed Dec 6, 2019, estimated cost $32K, described as “Modification to plumbing system related to combination of existing co-op apartments #9C and #9D, as per plans filed herewith. No change in use, egress or occupancy.”
Property taxes
- Assessment
- $16,134,750
- 2026–27 tax
- $1,729,016
- Market value (city estimate)
- $35,855,000
- Taxable value
- $15,386,710
- Assessed land
- $1,368,000
- Assessed improvements
- $14,766,750
Tax breaks
- Co-op and condo abatement, with no end date, a $185,222 credit this tax year.
Zoning
R10 (part of the lot is C6-1): floor area ratio 14.25 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
- Sep 3, 2026: $2,350,000
- Jun 29, 2026: $1,312,500
- Oct 23, 2025: $3,165,000
- Apr 7, 2025: $1,705,000
- Oct 31, 2024: $1,450,000
- Feb 27, 2024: $2,375,000
- Jan 29, 2024: $4,025,000
- Oct 26, 2023: $3,600,000
- Jul 12, 2023: $2,500,000
- Dec 23, 2022: $1,157,500
The 10 most recent of 31 open-market sales since 2016, from the Department of Finance’s sales files.
Board and land use applications
- Union Square South (City Planning 2019M0123): Completed, decided Nov 4, 2020. This is an application by the Department of City Planning requesting a zoning map and zoning text amendment to expand the Special Union Square District, create a new subdistrict (Subdistrict B), and establish a special permit for new hotel…