40 West 23rd Street, Manhattan
Commercial · built c. 1911 · Block 824, Lot 28.
Building permits
- No Work, filed Aug 21, 2026, described as “Member and sponsor appreciation event for a year of sponsorship. Scheduled date 09/09/26, rain date 09/17/26.”
- Alteration, filed Jul 7, 2026, estimated cost $550K, described as “General construction for lobby renovations as shown on plans filed herewith. No change in use, egress, or occupancy.”
- Alteration, filed Mar 13, 2026, estimated cost $110K, described as “General construction including renovation of an existing accessory pantry located on accessory terrace. No change in use, egress, or occupancy.”
- Alteration, filed Feb 25, 2026, estimated cost $550K, described as “Construction of steel framed glass canopy, steel framed glass cube skylight, and strip skylight at the existing building terrace.”
- Alteration, filed Jan 9, 2026, estimated cost $75K, described as “Alteration application consists of New Rooftop Terrace as an accessory space for commercial office and new egress bulkhead. Additional work as shown on plans filed herewith.”
- Alteration, filed Jan 8, 2026, estimated cost $182K, described as “General Construction work for removal and installation of interior non-bearing partitions, related finishes, and increase occupant load at 2nd floor offices as shown on plans herewith.”
- Alteration, filed Nov 17, 2025, estimated cost $350K, described as “Work consists of new interior partitions, windows, doors, and finishes at the 5TH floor.”
- Alteration, filed Aug 19, 2025, estimated cost $2.4M, described as “Work includes partial demolition of existing walls and finishes as shown on plans. New convenience stair (PDA00007812), restrooms, & finishes on 5-7TH for a single tenant. Glass enclosure filed under job M01286264-I1, AltCO filed under…”
- Alteration, filed Jun 10, 2025, estimated cost $1K, described as “Installation of gantry/needle beam scaffolding as per plans. No change in egress, use, or occupancy.”
- Alteration, filed Apr 28, 2025, estimated cost $25K, described as “Modifications to existing Sprinkler Systems as per plans filed herewith. No change in use, egress or occupancy.”
- Alteration, filed Apr 24, 2025, estimated cost $1K, described as “Installation of steel pipe scaffolding with platform & netting as per plans . No change in egress, use, or occupancy.”
- Alteration, filed Mar 12, 2025, estimated cost $1K, described as “Installation of temporary mechanical equipment protection as per plans. No change in use, egress or occupancy shall comply with CHAPTER#33 of 2022 the ny building code.”
- Alteration, filed Jan 6, 2025, estimated cost $2.3M, described as “Renovation of existing commercial space at 4th floor. General construction involves Installation of interior non-bearing partitions and related finishes as per drawings filed herewith. No change in use, egress or occupancy.”
- Alteration, filed Nov 12, 2024, estimated cost $2.6M, described as “General construction and structural work for a new new glass atrium enclosure as shown on plans.”
- Alteration, filed Oct 14, 2024, estimated cost $600K, described as “General construction work to include demolition of existing atrium skylight and partial re-building of East and South walls above 5th floor roof and 7th floor parapet. A new Atrium Enclosure will be filed under a separate application.”
- Alteration, filed Oct 2, 2024, estimated cost $76K, described as “Propose to perform interior renovations. No change in use, egress or occupancy.”
- Alteration, filed Sep 25, 2024, estimated cost $1K, described as “Proposed installation of temporary light duty pipe scaffold as per plans. Work shall comply with chapter #33 of 2022 the NYC building code. No change in use, occupancy, or egress under this application.”
- Alteration, filed Sep 25, 2024, 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 2022 the NYC building code. Live load 300PSF.”
- Alteration, filed May 2, 2024, estimated cost $1.4M, described as “Application filed to establish an accessory terrace at roof level and for vertical extension of elevator bulkhead.”
- Alteration, filed Apr 24, 2024, estimated cost $350K, described as “Structural work as shown on plans to include extension of elevator bulkhead at roof and structural framing elements for new accessory roof terrace to offices, in conjunction with Alt CO # M01027854-I1. Work to also include non-mechanical…”
- Alteration, filed Apr 18, 2024, estimated cost $100K, described as “General construction work to include non-structural demolition of partitions and finishes as shown on plans”
- Alteration, filed Apr 18, 2024, estimated cost $100K, described as “General construction work to include non-structural demolition of partitions and finishes as shown on plans”
- Alteration, filed Apr 18, 2024, estimated cost $70K, described as “General construction work to include non-structural demolition of partitions and finishes as shown on plans”
- Alteration, filed Nov 15, 2023, estimated cost $40K, described as “Modification to existing HVAC system as per plans filed herewith. NO change in use, egress or occupancy.”
- Alteration, filed Nov 15, 2023, estimated cost $9K, described as “Modification to existing Sprinkler system as per plans filed herewith. No change in use, egress or occupancy under this application.”
40 more, older permits are in this building’s full list on the map.
Property taxes
- Assessment
- $116,983,000
- 2026–27 tax
- $12,690,316
- Market value (city estimate)
- $259,962,200
- Taxable value
- $116,983,000
- Assessed land
- $28,350,000
- Assessed improvements
- $88,633,000
Zoning
C6-4M: floor area ratio 7.85 built, 10.00 allowed by base zoning.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Landmarks
Part of Ladies' Mile Historic District (Historic District). 50 Landmarks Preservation Commission permits are on file.
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.
- Change to an earlier grant (Board of Standards and Appeals 155-69-A): Change to an earlier grant, Granted, filed May 18, 1999, decided Nov 9, 1999. Extension of Term-Reopening-Elevator-in-Readiness
- 56-74 W23RD ST A/K/A 696-712 6TH AVE (City Planning P1998M0296): Completed, decided Nov 30, 1998. 95DCP044M: REZONE ALL BUT THE EASTERN BLOCKFRONT OF BLOCK BOUNDED BY 5TH AVE, 6TH AVE, W22ND ST, W23RD ST FROM M1-6M TO C65-2, C6-4 & C6-4M
- 28-40 W23RD ST (City Planning P1984M0471): Completed, decided Oct 9, 1986. CONSENT FOR FRANCHISE TO ERECT, MAINTAIN & OPERATE 9 NEW*ORNAMENTAL LAMP POSTS