373 Park Avenue South, Manhattan
Commercial · built c. 1911 · Block 882, Lot 3.
Building permits
- Alteration, filed Aug 20, 2026, estimated cost $345K, described as “Interior renovation of existing partition and construction of partition. No change in use, occupancy, or egress.”
- Alteration, filed May 21, 2026, estimated cost $40K, described as “Removal of interior non-load bearing partitions,doors, finishes lt fixtures, built-in millwork and kitchen equipment. No change to use occupancy or egress.”
- Alteration, filed Dec 11, 2025, estimated cost $36K, described as “On 10th fl, non bearing partitions and finishes removal. No change in use, egress, or occupancy”
- Alteration, filed Dec 10, 2025, estimated cost $36K, described as “For the 9th fl, non bearing partitions and finishes removal. No change in use, egress, or occupancy”
- Alteration, filed Dec 8, 2025, estimated cost $36K, described as “For the 7th fl. Non bearing partitions and finishes removal. No change in use, egress or occupancy”
- Alteration, filed Apr 23, 2024, estimated cost $160K, described as “Mt. Sinai - cardiology consolidation - structural modifications according to plans filed herewith. No change to use, egress or occupancy.”
- Alteration, filed Jan 29, 2024, described as “Installation of suspended scaffold for facade work or inspection . Amend PAA1, added scaffold drop”
- Alteration, filed Jun 8, 2023, estimated cost $778K, described as “Facade repairs to include Masonry, pointing, caulking/sealing, masonry coating, sills, coping caps, scrape, prime and paint railings.”
- Alteration, filed Jun 8, 2023, estimated cost $1K, described as “Installation of temporary heavy duty sidewalk shed as per plans. No change in use, egress or occupancy. Sidewalk shed shall comply with chapter #33 of the NYC building code. Live load 300PSF.”
- Alteration, filed Sep 20, 2022, estimated cost $12K, described as “Installation of plumbing fixtures as per plans filed”
- Alteration, filed Jun 3, 2022, estimated cost $10K, described as “Minor construction work on the 2nd floor (Aegis) as indicated on drawings”
- Alteration, filed May 31, 2022, estimated cost $86K, described as “Sprinkler modification as indicated on the plans filed herewith. No change in use, egress or occupancy.”
- Alteration, filed May 20, 2022, estimated cost $362K, described as “Plumbing modifications as indicated on theplans filed herewith. No change is use, egress or occupancy.”
- Alteration, filed May 19, 2022, estimated cost $1.5M, described as “Mechanical modification including installation of ac unit and relating duct and piping as indicated on the plans filed herewith. No change in use, egress or occupancy.”
- Alteration, filed May 16, 2022, estimated cost $142K, described as “Structural modifications as indicated on the plans filed herewith. No change in use, egress or occupancy.”
- Alteration, filed May 13, 2022, estimated cost $3.5M, described as “Partitions, ceiling and door modifications as indicated on the plans filed herewith. No change in use, egress or occupancy.”
- Alteration, filed Feb 17, 2022, estimated cost $750K, described as “Minor demolition and renovation (interior partitions/ lighting/ low-voltage/ HVAC alterations) at 5TH floor level only. No change in use occupancy or egress.”
- Alteration, filed Jun 17, 2021, estimated cost $50K, described as “Interior demolition of non load bearing partitions on the 11th and 12th floor as indicated on drawings.”
- Alteration, filed Nov 20, 2019, estimated cost $1K, described as “Installation of temporary heavy duty sidewalk shed as per plans. No change in use, egress or occupancy.sidewalk shed shall comply with chapter #33 of the NYC building code.live load 300PSF.”
- Alteration, filed Oct 25, 2019, described as “Installation of pipe scaffold as per plans. No change in use, egress or occupancy.”
Property taxes
- Assessment
- $8,815,050
- 2026–27 tax
- $864,912
- Market value (city estimate)
- $19,589,000
- Taxable value
- $7,973,010
- Assessed land
- $3,451,500
- Assessed improvements
- $5,363,550
Zoning
C6-4A: floor area ratio 11.12 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
- Nov 19, 2025: $104,000,000, sold with other lots
Open-market sales since 2016, from the Department of Finance’s sales files.
Board and land use applications
- Flatiron BID Expansion (City Planning 2021M0260): Business improvement district, Completed, filed Nov 30, 2020, decided May 19, 2021. An application from the Small Business Services (SBS) on behalf of the Flatiron Business Improvement District (BID) to modify the existing plan and expand the BID in Community Districts 4 and 5 of Manhattan.