| Owner | Filings | Most Recent |
|---|---|---|
| 540 W 21st Street Holdings | 43 | 07/08/2026 |
| Legion Investment Group | 32 | 10/16/2026 |
| Titan Industrial Services | 23 | 07/08/2026 |
| 550 W21 STR | 2 | 03/22/2026 |
| Atlantic Foundation | 2 | 03/21/2026 |
| Associated Construction Managment | 1 | 03/22/2026 |
| Date | Price | Unit | Seller → Buyer | $/sf |
|---|---|---|---|---|
| 04/15/2024 | $87.4M | — | 540 WEST 21ST STREET HOLDINGS LLC → 550W21 OWNER LLC | — not available |
| Firm | Filings | Most Recent |
|---|---|---|
| Rigid Structural Design | 10 | 10/14/2026 |
| MJ Engineering & Design | 2 | 09/17/2026 |
| Golden Glow Architectural Studios D | 1 | 07/20/2026 |
| Paul Perdek, Prof. Engineering | 4 | 05/27/2026 |
| Plan B Engineering | 2 | 12/16/2025 |
| Lombardo Professional Engineering | 2 | 11/14/2025 |
| Ventrop Engineering Consulting Group | 4 | 10/28/2025 |
| Ancora Engineering | 4 | 06/24/2025 |
| Structuretech NY | 3 | 03/13/2025 |
| Gace | 1 | 01/22/2025 |
| Baileys Engineering | 1 | 01/17/2019 |
| Langan Engineering, Environmental | 1 | 09/10/2018 |
| KZ Engineering | 4 | 06/19/2018 |
| Representative | Filings | Most Recent |
|---|---|---|
| MJ Engineering & Design | 2 | 03/21/2026 |
| Rigid Structural Design | 16 | 03/21/2026 |
| Domani Consulting | 11 | 03/21/2026 |
| A1 Expediting Service | 6 | 03/21/2026 |
| Hierarch-E | 4 | 03/21/2026 |
| Lombardo Professional Engineering | 4 | 03/21/2026 |
| AE Design Solution | 6 | 03/21/2026 |
| Synergy Building Consultants | 4 | 03/21/2026 |
| Firm | Trade | Roles | Most Recent |
|---|---|---|---|
| Arsenal Scaffold | Scaffold | 14 | 07/08/2026 |
| Core Scaffold Systems | Scaffold | 14 | 07/08/2026 |
| Skyline Scaffolding Group | Scaffold | 8 | 07/31/2026 |
| KG Sprinkler | Fire Protection | 4 | 10/16/2026 |
| CM and Associates Construction | General Contractor | 4 | 07/25/2026 |
| Suffolk Construction Company | Scaffold | 4 | 07/08/2026 |
| Casino Development Group | Scaffold | 3 | 04/09/2026 |
| Star-Delta Electric | Electrical | 2 | 03/21/2026 |
| JMD Contracting of NY | Scaffold | 2 | 04/09/2026 |
| Team Electric | Electrical | 2 | 03/22/2026 |
| Team Electric | Electrical | 2 | 03/21/2026 |
| Donato Plumbing | Plumbing | 1 | 07/08/2026 |
| Nash Electric Services | Electrical | 1 | 03/21/2026 |
| Structuretech New York | Scaffold | 1 | 07/08/2026 |
| A & M Electrical Service | Electrical | 1 | 03/22/2026 |
| Donato Plumbing Group | Plumbing | 1 | 07/08/2026 |
| Agency | License # | Filings | Most Recent |
|---|---|---|---|
| MJ Engineering & Design | 5546 | 2 | 09/17/2026 |
| Leo Y Lee Associates | 2481 | 2 | 05/27/2026 |
| Domani Inspection Service | 843 | 4 | 10/28/2025 |
| Ancora Engineering | 6818 | 4 | 06/24/2025 |
| Source | Work Type | Status | Applicant | Issued |
|---|---|---|---|---|
| DOB NOW | Standpipe | Permit Issued | KG Sprinkler | 10/15/2026 |
| DOB NOW | Sidewalk Shed | Permit Issued | Skyline Scaffolding Group | 07/30/2026 |
| DOB NOW | General Construction | Permit Issued | CM and Associates Construction | 07/23/2026 |
| DOB NOW | Plumbing | Permit Issued | Donato Plumbing Group | 05/28/2026 |
| DOB NOW | Construction Fence | Permit Issued | Skyline Scaffolding Group | 05/14/2026 |
| DOB NOW | Protection and Mechanical Methods | Permit Issued | Skyline Scaffolding Group | 05/14/2026 |
| DOB NOW | Protection and Mechanical Methods | Permit Issued | Skyline Scaffolding Group | 05/13/2026 |
| DOB NOW | Mechanical Systems | Permit Issued | CM and Associates Construction | 05/06/2026 |
| DOB NOW | Plumbing | Permit Issued | Donato Plumbing | 05/06/2026 |
| DOB NOW | Suspended Scaffold | Permit Issued | JMD Contracting of NY | 03/16/2026 |
| DOB NOW | Protection and Mechanical Methods | Permit Issued | The I-Grace Company Commi | 03/09/2026 |
| DOB NOW | Sprinklers | Permit Issued | H M Sprinkler | 02/12/2026 |
| DOB NOW | Standpipe | Permit Issued | H M Sprinkler | 02/12/2026 |
| DOB NOW | Construction Fence | Permit Issued | Core Scaffold Systems | 11/26/2025 |
| DOB NOW | Protection and Mechanical Methods | Permit Issued | The I-Grace Company Commi | 11/14/2025 |
| DOB NOW | Protection and Mechanical Methods | Permit Issued | The I-Grace Company Commi | 11/14/2025 |
| DOB NOW | Suspended Scaffold | Permit Issued | JMD Contracting of NY | 11/06/2025 |
| DOB NOW | Construction Fence | Permit Issued | Skyline Scaffolding Group | 09/30/2025 |
| DOB NOW | Standpipe | Permit Issued | H M Sprinkler | 09/30/2025 |
| DOB NOW | Protection and Mechanical Methods | Permit Issued | Skyline Scaffolding Group | 09/02/2025 |
| DOB NOW | Sidewalk Shed | Permit Issued | Skyline Scaffolding Group | 08/05/2025 |
| DOB NOW | Protection and Mechanical Methods | Permit Issued | Skyline Scaffolding Group | 06/17/2025 |
| DOB NOW | General Construction | Signed-off | Christopher B. Mesbah | 05/16/2025 |
| DOB NOW | Support of Excavation | Signed-off | Christopher B. Mesbah | 03/13/2025 |
| DOB NOW | Construction Fence | Permit Issued | Structuretech New York | 02/25/2025 |
| DOB NOW | Construction Fence | Permit Issued | Core Scaffold Systems | 12/06/2024 |
| DOB NOW | Construction Fence | Permit Issued | Core Scaffold Systems | 12/13/2023 |
| DOB NOW | Construction Fence | Permit Issued | Core Scaffold Systems | 12/20/2022 |
| DOB NOW | Sidewalk Shed | Signed-off | Arsenal Scaffold | 07/01/2022 |
| DOB NOW | Construction Fence | Permit Issued | Core Scaffold Systems | 12/23/2021 |
| DOB NOW | Sidewalk Shed | Signed-off | Arsenal Scaffold | 03/15/2021 |
| DOB NOW | Sidewalk Shed | Signed-off | Arsenal Scaffold | 03/15/2021 |
| DOB NOW | Supported Scaffold | Signed-off | Arsenal Scaffold | 03/08/2021 |
| DOB NOW | Supported Scaffold | Signed-off | Arsenal Scaffold | 03/08/2021 |
| DOB NOW | Sidewalk Shed | Signed-off | Arsenal Scaffold | 03/05/2021 |
| DOB NOW | Supported Scaffold | Signed-off | Arsenal Scaffold | 03/05/2021 |
| DOB NOW | Supported Scaffold | Permit Issued | Arsenal Scaffold | 03/05/2021 |
| DOB NOW | Construction Fence | Permit Issued | Core Scaffold Systems | 01/04/2021 |
| DOB NOW | Sidewalk Shed | Permit Issued | Core Scaffold Systems | 01/09/2020 |
| DOB NOW | Construction Fence | Permit Issued | Suffolk Construction Company | 01/09/2020 |
| Filed | Status | Contractor | Scope | Make / Model / Capacity |
|---|---|---|---|---|
| 10/28/2025 | Permit Issued | CM and Associates Construction | Heating and Air Conditioning Systems, Ventilation Systems |
| Filed | Status | Contractor | Scope |
|---|---|---|---|
| 10/28/2025 | Permit Issued | KG Sprinkler | 2 outlets |
| Filed | Status | Contractor | Scope |
|---|---|---|---|
| 10/28/2025 | Permit Issued | Donato Plumbing Group | Gas, Storm, Water/Sanitary |
| Filed | Status | Contractor | Scope |
|---|---|---|---|
| 07/17/2026 | Permit Issued | Team Electric | General Wiring |
| 04/16/2026 | Permit Issued | Jam Electrical | — |
| 02/12/2026 | Permit Issued | Team Electric | General Wiring |
| 12/02/2025 | Permit Issued | Team Electric | 2 meters, 2 new_meters |
| 09/03/2025 | Permit Issued | Top Shelf Electric | — |
| 05/08/2025 | Permit Issued | A & M Electrical Service | 1 meters, 1 new_meters |
| 07/26/2019 | Permit Issued | Top Shelf Electric | 1 meters, 1 new_meters |
| 06/19/2018 | Complete | Nash Electric Services | — |
| 06/06/2018 | Complete | Nash Electric Services | — |
| Filed | Status | Contractor | Scope |
|---|---|---|---|
| 06/24/2025 | Signed-off | CM and Associates Construction | 1 scope_items |
| 06/12/2025 | Signed-off | CM and Associates Construction | 2 scope_items |
| Filed | Status | Contractor | Scope |
|---|---|---|---|
| 11/13/2025 | Permit Issued | Skyline Scaffolding Group | Sidewalk Shed |
| 09/29/2025 | Permit Issued | Skyline Scaffolding Group | Fence |
| 03/13/2025 | Permit Issued | Structuretech New York | Fence |
| 07/20/2021 | Permit Issued | Core Scaffold Systems | Fence |
| 01/17/2019 | Permit Issued | Core Scaffold Systems | Sidewalk Shed |
| 07/03/2018 | Permit Issued | Suffolk Construction Company | Fence |
| Filed | Status | Contractor | Scope |
|---|---|---|---|
| 05/27/2026 | Permit Issued | JMD Contracting of NY | Suspended Scaffold |
| Filed | Status | Contractor | Scope |
|---|---|---|---|
| 05/27/2026 | Permit Issued | JMD Contracting of NY | Suspended Scaffold (SC) |
| Date | Type | Result | Report |
|---|---|---|---|
| 07/09/2026 | Certified Sprinkler-SP-Fixtures-Finish | Certified | View ↗ |
| 07/08/2026 | Pass-Final PL - Underground | Pass | View ↗ |
| 05/18/2026 | Certified Water and Sanitary-WS-Fixtures-Finish | Certified | View ↗ |
| 05/15/2026 | Pass-Final PL - Up to 3 Requested Floors | Pass | View ↗ |
| 12/22/2025 | Certified StandPipe - SD - Alarm Sys 64/09 - Finish | Certified | View ↗ |
| 12/22/2025 | Certified StandPipe - SD - Hydrostatic 63/09 Test (Initial 75 Feet) | Certified | View ↗ |
| Date | Requirement | Inspector | Role |
|---|---|---|---|
| 09/14/2026 | Post-installed Anchors | Magdy Youssef | special |
| 07/16/2026 | Final | JOHN MCMONAGLE | progress |
| 05/27/2026 | Post-installed Anchors | Leo Lee | special |
| 05/20/2026 | Post-installed Anchors | Leo Lee | special |
| 09/12/2025 | HVAC-R and service water piping design and insulation | JOHN MCMONAGLE | energy_progress |
| 09/12/2025 | HVAC-R and service water heating equipment | JOHN MCMONAGLE | energy_progress |
| 09/12/2025 | HVAC-R and service water heating system controls | JOHN MCMONAGLE | energy_progress |
| 09/12/2025 | Maintenance information | JOHN MCMONAGLE | energy_progress |
| 08/28/2025 | Duct leakage testing, insulation and design | JOHN MCMONAGLE | energy_progress |
| 08/28/2025 | Emergency and Standby Power Systems (Generator) | JOHN MCMONAGLE | special |
| 08/28/2025 | Fire-Resistant Penetrations and Joints | JOHN MCMONAGLE | special |
| 08/28/2025 | Post-installed Anchors | JOHN MCMONAGLE | special |
| 08/28/2025 | Exterior lighting power | JOHN MCMONAGLE | energy_progress |
| 08/28/2025 | HVAC-R and service water heating system controls | JOHN MCMONAGLE | energy_progress |
| 08/28/2025 | Interior lighting power | JOHN MCMONAGLE | energy_progress |
| 08/28/2025 | HVAC-R and service water heating equipment | JOHN MCMONAGLE | energy_progress |
| 08/28/2025 | Electrical motors and elevators | JOHN MCMONAGLE | energy_progress |
| 08/28/2025 | HVAC-R and service water piping design and insulation | JOHN MCMONAGLE | energy_progress |
| 08/28/2025 | Lighting in dwelling units | JOHN MCMONAGLE | energy_progress |
| 08/28/2025 | Lighting controls | JOHN MCMONAGLE | energy_progress |
| 08/28/2025 | Metering | JOHN MCMONAGLE | energy_progress |
| 08/28/2025 | Maintenance information | JOHN MCMONAGLE | energy_progress |
| 08/27/2025 | Fire-Resistant Penetrations and Joints | JOHN MCMONAGLE | special |
| 08/27/2025 | Private On-Site Storm Water Disposal Systems-, and Detention Facilities, Installation | JOHN MCMONAGLE | special |
| 08/19/2025 | Standpipe Systems | JOHN MCMONAGLE | special |