Walk-up cooperative

450 WEST 23RD STREET

MANHATTAN · BIN 1012711

💬 Discuss this project

1856Year Built

6Stories

C6Building Class

R7BZoning

7,244 sfGross Floor Area

5Units

Rent Stabilized1 Active Violation 0 unresolved · 1 paperwork only ▸FDNY Report ↗

Walk-up cooperative · Owner of record: 450 West 23rd St Tenants · 2,370 sf lot · 3.06 FAR built · Flood zone X

Locations of Work

ArchitectureStructuralElectricalMechanicalPlumbingFire ProtectionEquipmentCivilGeneral

Names shown beside floors are taken automatically from the text of filed documents and may be incomplete or wrong.

Floor 213p · 1 filing · 20 docs

Floor 1Unit 1A12p · 1 filing · 20 docs

Cellar13p · 1 filing · 20 docs

Basement1p · 1 filing · 20 docs

Site & exteriorHeavy duty sidewalk shed and pipe scaffolding installation23p · 3 filings · 20 docs

▾Owner History (Filing Record)

Companies and organizations named on filings. Individual owners are not shown.

Owner	Filings	Most Recent
450 West 23rd St Tenants	22	03/22/2026

▾Design Consultants (Architect / Engineer of Record)

Firm	Filings	Most Recent
2L Engineering	2	08/05/2025
Mje Professional Services	1	05/08/2025
Alex Taylor Architecture	3	12/09/2024
Mohammad Ahead, PE	1	05/09/2023

▾Filing Representatives (Expediters)

Representative	Filings	Most Recent
Nyccode	10	03/21/2026
SNR Expediting Design	2	03/21/2026
Arsenal Building Consultants	2	03/21/2026

▾Contractors (License-Anchored)

Firm	Trade	Roles	Most Recent
Excellent General Contra*	General Contractor	12	03/21/2026
J & G Construction Services	Scaffold	4	07/08/2026
Adam Kushner	Electrical	1	03/21/2026
Leader Electric Co	Electrical	1	03/22/2026
Orange Mechanical	specialty_contractor	1	07/08/2026
Reliable Enterprises	Scaffold	1	04/09/2026

▾Special Inspection Agencies

Agency	License #	Filings	Most Recent
Alan Margolin & Associates	423	4	08/05/2025

Building Lifecycle

All (56)Filed (7)Permit Issued (8)Signed Off (4)Violation (22)Objection (2)Special Inspection (13)

08/22/2025

Signed off — Alteration

mechanical work associated with the proposed renovation as shown on plans filed herewith. no change to use, egress or occupancy

M00952471-I1

08/22/2025

Signed off — Alteration

mechanical work associated with the proposed renovation as shown on plans filed herewith. no change to use, egress or occupancy

M00952471-S5

08/05/2025

Filed — Alteration

mechanical work associated with the proposed renovation as shown on plans filed herewith. no change to use, egress or occupancy

M00952471-P2

08/01/2025

Special inspection requirement — Mechanical Systems

Young Suh

08/01/2025

Special inspection requirement — Final

Young Suh

06/04/2025

Violation issued (HPD, closed)

05/09/2025

Permit issued — Supported Scaffold

M01222793-I1-SF

05/08/2025

Filed — Alteration

PROPOSED INSTALLATION OF TEMPORARY PIPE SCAFFOLD AS PER PLANS. WORK SHALL COMPLY WITH CHAPTER #33 OF THE NYC BUILDING CODE. NO CHANGE IN USE, OCCUPANCY, OR EGRESS UNDER THIS APPLICATION.

M01222793-I1

01/14/2025

Signed off — Alteration

mechanical work associated with the proposed renovation as shown on plans filed herewith. no change to use, egress or occupancy

M00952471-S3

12/19/2024

Permit issued — Earth Work

M00952471-S3-EA

12/19/2024

Permit issued — Earth Work

M00952471-S3-ST

12/10/2024

Special inspection requirement — Final

Young Suh

12/10/2024

Special inspection requirement — Concrete - Cast-In-Place

Young Suh

12/10/2024

Special inspection requirement — Subsurface Conditions – Fill Placement & In-Place Density

Young Suh

12/10/2024

Special inspection requirement — Structural Stability – Alterations of existing buildings

Young Suh

12/10/2024

Special inspection requirement — Excavations - Sheeting, Shoring, and Bracing

Young Suh

12/09/2024

Filed — Alteration

mechanical work associated with the proposed renovation as shown on plans filed herewith. no change to use, egress or occupancy

M00952471-P1

11/29/2024

Special inspection requirement — Final

Young Suh

11/29/2024

Special inspection requirement — Concrete - Cast-In-Place

Young Suh

11/29/2024

Special inspection requirement — Excavations - Sheeting, Shoring, and Bracing

Young Suh

11/29/2024

Special inspection requirement — Structural Stability – Alterations of existing buildings

Young Suh

11/29/2024

Special inspection requirement — Subsurface Conditions – Fill Placement & In-Place Density

Young Suh

09/03/2024

Permit issued — Mechanical Systems

M00952471-S5-MS

09/03/2024

Permit issued — General Construction

M00952471-I1-GC

08/30/2024

Permit issued — Earth Work

M00952471-S3-GC

07/26/2024

Filed — Alteration

mechanical work associated with the proposed renovation as shown on plans filed herewith. no change to use, egress or occupancy

M00952471-S5

07/26/2024

Objection resolved — Addressed

07/25/2024

Objection raised — Scope

06/28/2024

Filed — Alteration

mechanical work associated with the proposed renovation as shown on plans filed herewith. no change to use, egress or occupancy

M00952471-S3

04/01/2024

Violation issued (HPD, closed)

11/15/2023

Violation issued (HPD, closed)

10/27/2023

Filed — Alteration

mechanical work associated with the proposed renovation as shown on plans filed herewith. no change to use, egress or occupancy

M00952471-I1

10/24/2023

Special inspection requirement — Final

Young Suh

08/16/2023

Signed off — Alteration

INSTALLATION OF HEAVY DUTY SIDEWALK SHED AND PIPE SCAFFOLDING. NO CHANGE IN USE, OCCUPANCY OR EGRESS. WORK SHALL COMPLY WITH CHAPTER 33 OF NYCC.

M00866092-I1

06/30/2023

Violation issued (DOB, closed)

V*-DOB VIOLATION - DISMISSED

05/11/2023

Permit issued — Sidewalk Shed

M00866092-I1-SH

05/11/2023

Permit issued — Sidewalk Shed

M00866092-I1-SF

05/09/2023

Filed — Alteration

INSTALLATION OF HEAVY DUTY SIDEWALK SHED AND PIPE SCAFFOLDING. NO CHANGE IN USE, OCCUPANCY OR EGRESS. WORK SHALL COMPLY WITH CHAPTER 33 OF NYCC.

M00866092-I1

03/15/2023

Violation issued (HPD, closed)

11/06/2017

Violation issued (HPD, closed)

10/01/2015

Violation issued (DOB, closed)

V-DOB VIOLATION - ACTIVE

10/16/2009

Violation issued (ECB, open)

Boilers

07/15/2009

Violation issued (DOB, closed)

V*-DOB VIOLATION - DISMISSED

04/17/2009

Violation issued (ECB, closed)

Unknown

02/07/2000

Violation issued (DOB, closed)

V*-DOB VIOLATION - DISMISSED

03/16/1999

Violation issued (DOB, closed)

V*-DOB VIOLATION - DISMISSED

05/04/1998

Violation issued (DOB, closed)

V*-DOB VIOLATION - DISMISSED

09/16/1997

Violation issued (DOB, closed)

V*-DOB VIOLATION - DISMISSED

08/29/1995

Violation issued (DOB, closed)

V*-DOB VIOLATION - DISMISSED

09/01/1994

Violation issued (DOB, closed)

V*-DOB VIOLATION - DISMISSED

12/10/1987

Violation issued (HPD, closed)

08/24/1981

Violation issued (HPD, closed)

08/24/1981

Violation issued (HPD, closed)

08/24/1981

Violation issued (HPD, closed)

08/24/1981

Violation issued (HPD, closed)

08/24/1981

Violation issued (HPD, closed)

Permit / Filing Register

Source	Work Type	Status	Applicant	Issued
DOB NOW	Supported Scaffold	Permit Issued	Reliable Enterprises	05/09/2025
DOB NOW	Earth Work	Signed-off	Excellent General Contra*	12/19/2024
DOB NOW	Earth Work	Signed-off	Excellent General Contra*	12/19/2024
DOB NOW	Mechanical Systems	Signed-off	Orange Mechanical	09/03/2024
DOB NOW	General Construction	Signed-off	Excellent General Contra*	09/03/2024
DOB NOW	Earth Work	Signed-off	Excellent General Contra*	08/30/2024
DOB NOW	Sidewalk Shed	Signed-off	J & G Construction Services	05/11/2023
DOB NOW	Sidewalk Shed	Signed-off	J & G Construction Services	05/11/2023
BIS	PL	ISSUED	Hub Plumbing & Heating	03/03/2025
BIS	—	ISSUED	450 West 23rd Street Tenants	02/06/2025
BIS	OT	ISSUED	Black Square Builders	04/10/2023
BIS	PL	ISSUED	Apec	01/27/2017
BIS	OT	ISSUED	CR Contracting	11/09/2016
BIS	PL	ISSUED	Rooter Plus	03/23/2015
BIS	PL	ISSUED	Orbit Plumbing & Heating	09/29/2014
BIS	OT	ISSUED	Black Square Builders	06/13/2014
BIS	PL	ISSUED	Orbit Plumbing & Heating	04/14/2014
BIS	BL	ISSUED	Rooter Plus	03/17/2014
BIS	OT	ISSUED	Black Square Builders	02/19/2014
BIS	PL	ISSUED	Rooter Plus	12/10/2013
BIS	OT	ISSUED	Senan Clancy Contracting	05/29/2013
BIS	BL	ISSUED	Rooter Plus	11/27/2012
BIS	PL	ISSUED	Rooter Plus	11/26/2012
BIS	PL	ISSUED	QMB Plumbing & Heating	08/13/2012
BIS	MH	ISSUED	Quality Ren Contracting	08/07/2012
BIS	BL	ISSUED	Gas Heat	01/06/1992
BIS	PL	ISSUED	Gas Heat	01/06/1992

3 projects · most recent 05/10/2024

General Wiring

Filed	Status	Contractor	Scope
05/10/2024	Complete	Leader Electric Co	6 meters, 4 new_meters
04/27/2023	Permit Issued	Richard Neu	—
01/23/2018	Complete	Antonio Ceriello Electric	General Wiring

1 project · most recent 05/08/2025

Scaffold

Filed	Status	Contractor	Scope
05/08/2025	Permit Issued	Reliable Enterprises	Scaffold

▾Special Inspection Requirements (DOB NOW) — 13

Date	Requirement	Inspector	Role
08/01/2025	Mechanical Systems	Young Suh	special
08/01/2025	Final	Young Suh	progress
12/10/2024	Final	Young Suh	progress
12/10/2024	Concrete - Cast-In-Place	Young Suh	special
12/10/2024	Subsurface Conditions – Fill Placement & In-Place Density	Young Suh	special
12/10/2024	Structural Stability – Alterations of existing buildings	Young Suh	special
12/10/2024	Excavations - Sheeting, Shoring, and Bracing	Young Suh	special
11/29/2024	Final	Young Suh	progress
11/29/2024	Concrete - Cast-In-Place	Young Suh	special
11/29/2024	Excavations - Sheeting, Shoring, and Bracing	Young Suh	special
11/29/2024	Structural Stability – Alterations of existing buildings	Young Suh	special
11/29/2024	Subsurface Conditions – Fill Placement & In-Place Density	Young Suh	special
10/24/2023	Final	Young Suh	progress

▾Documents — 198 on file (BIS + DOB NOW)

▸Plans & Drawings7

▸DOB NOWPlans/Sketch7

08/31/2026M00866092-I1Request digital key ↗

08/25/2026M00952471-P1Request digital key ↗

08/25/2026M00952471-I1Request digital key ↗

Showing 3 of 7 on file for this type

▸Applications & Permits52

▸BISPLAN / WORK APPROVAL APPLICATION29

06/02/2025122566204Open ↗

05/22/2025122566204Open ↗

04/18/2025121532582Open ↗

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▸BISWORK PERMIT APPLICATION17

03/03/2025121532582Open ↗

02/06/2025124041401Open ↗

04/10/2023121532582Open ↗

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▸DOB NOWLPC Approval/Permit5

08/25/2026M00952471-S5Open ↗

08/25/2026M00952471-S3Open ↗

08/13/2026M00952471-I1Open ↗

Showing 3 of 5 on file for this type

▸BISCERTIFICATE OF OCCUPANCY: APPLICATION1

08/29/2025124041401Open ↗

▸Seals & Professional Certifications24

▸BISTECHNICAL REPORT: RESPONSIBILITY/CERTIFICATION7

11/16/2016122566204Open ↗

10/08/2013121801069Open ↗

09/10/2012121370248Open ↗

Showing 3 of 7 on file for this type

▸DOB NOWDPL-1: Design Professional Seal & Signature7

08/31/2026M00866092-I1Open ↗

08/25/2026M00952471-S3Open ↗

08/25/2026M00952471-S5Open ↗

Showing 3 of 7 on file for this type

▸DOB NOWProgress Inspector Seal & Signature4

09/19/2026M00952471-P2Open ↗

09/01/2026M00952471-S3Open ↗

08/28/2026M00952471-P1Open ↗

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▸DOB NOWSpecial Inspector Seal & Signature3

09/19/2026M00952471-P2Open ↗

09/01/2026M00952471-S3Open ↗

08/28/2026M00952471-P1Open ↗

▸BISPROFESSIONAL CERTIFIED CHECKLIST2

12/04/2015122566204Open ↗

11/12/2015122566204Open ↗

▸BISPROFESSIONAL CERTIFICATION STATEMENT1

11/12/2015122566204Open ↗

▸Trade Schedules & Equipment27

▸BISSCHEDULE B - PLUMBING/SPRINKLER/STANDPIPE10

02/21/2018122566204Open ↗

03/17/2017122566204Open ↗

03/15/2017122566204Open ↗

Showing 3 of 10 on file for this type

▸BISSCHEDULE B - PLUMBING7

05/22/2025122566204Open ↗

03/06/2025121532582Open ↗

07/02/2024121532582Open ↗

Showing 3 of 7 on file for this type

▸BISSELF-CERT PLUMBING NOTICE7

10/17/2014121532582Open ↗

10/16/2014121801069Open ↗

10/15/2014121801069Open ↗

Showing 3 of 7 on file for this type

▸BISSCHEDULE C - HEATING & COMBUSTION EQUIPMENT1

09/10/2012121370248Open ↗

▸BISHVAC & SERVICE WATER HEATING EQUIPMENT1

12/02/2024121801069Open ↗

▸BISHVAC & SERVICE WATER HEATING SYSTEM CONTROLS1

12/02/2024121801069Open ↗

▸Safety & Tenant Protection7

▸BISSTREET TREE CHECKLIST4

01/16/2025124041401Open ↗

11/12/2015122566204Open ↗

10/08/2013121801069Open ↗

Showing 3 of 4 on file for this type

▸BISST-1 Street Tree Checklist1

02/25/2013121532582Open ↗

▸BISEXCAVATION OR DEMOLITION: 5-DAY NOTICE1

11/06/2014121801069Open ↗

▸BISDS1-Demolition Submittal Certification Form1

01/29/2014121801069Open ↗

▸Environmental & Asbestos6

▸BISASBESTOS: CERTIFICATION (DEP ACP5)3

05/03/2023121532582Open ↗

09/10/2012121370248Open ↗

06/21/2012121121810Open ↗

▸DOB NOWDEP ACP-5: Asbestos Assessment Report2

08/25/2026M00952471-S5Open ↗

08/13/2026M00952471-P2Open ↗

▸BISACP5 ASBESTOS: CERTIFICATION (DEP ACP5)1

02/25/2013121532582Open ↗

▸Energy Compliance18

▸BISTECHNICAL REPORT: ENERGY CODE PROGRESS INSPS4

12/04/2015122566204Open ↗

10/08/2013121801069Open ↗

09/10/2012121370248Open ↗

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▸BISAS-BUILT ENERGY ANALYSIS (EN2)3

10/02/2025121532582Open ↗

12/02/2024121801069Open ↗

01/02/2023122566204Open ↗

▸BISAS-BUILT ENERGY ANALYSIS2

12/09/2022122566204Open ↗

12/01/2022122566204Open ↗

▸BISTR8: Energy Code Progress Inspections2

05/30/2013121532582Open ↗

02/25/2013121532582Open ↗

▸BISLIGHTING IN DWELLING UNITS1

12/02/2024121801069Open ↗

▸BISENERGY CODE COMPLIANCE INSPECTIONS1

12/02/2024121801069Open ↗

▸BISLIGHTING CONTROLS1

12/02/2024121801069Open ↗

▸BISAIR SEALING AND INSULATION - VISUAL1

12/02/2024121801069Open ↗

▸BISTR8: ENERGY CODE PROGRESS INSPS TECHNICAL REPORT1

01/03/2023122566204Open ↗

▸BISNYCECC EXEMPTION1

01/16/2025124041401Open ↗

▸BIS* HVAC INSULATION AND SEALING1

12/02/2024121801069Open ↗

▸Inspections & Test Reports9

▸BISTECHNICAL REPORT: RESPONSIBILITY6

10/01/2025121532582Open ↗

01/16/2025124041401Open ↗

05/15/2023121532582Open ↗

Showing 3 of 6 on file for this type

▸BISFIRE-RESISTANT PENETRATIONS AND JOINTS (FIRESTOP)2

10/01/2025121532582Open ↗

12/02/2024121801069Open ↗

▸BISMECHANICAL SYSTEMS1

12/02/2024121801069Open ↗

▸Approvals, Objections & Sign-offs16

▸BISLANDMARKS APPROVAL4

01/17/2025124041401Open ↗

12/04/2015122566204Open ↗

01/29/2014121801069Open ↗

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▸BISLANDMARKS SIGNOFF2

01/17/2025121801069Open ↗

12/07/2022122566204Open ↗

▸BISSUPERSEDING LETTER2

03/04/2025121532582Open ↗

07/01/2014121532582Open ↗

▸BISFINAL2

10/01/2025121532582Open ↗

01/02/2023122566204Open ↗

▸BISADMINISTRATIVE OBJECTIONS2

02/25/2013121532582Open ↗

06/28/2012121121810Open ↗

▸BISCERTIFICATE OF OCCUPANCY/LOC: REQUEST2

10/03/2025121532582Open ↗

01/22/2025121801069Open ↗

▸BISSCHEDULE A - OCCUPANCY / USE1

11/19/2024124041401Open ↗

▸BISCONSTRUCTION (OT) SIGNOFF1

01/02/2023122566204Open ↗

▸Cost, Insurance & Ownership14

▸BISCOST AFFIDAVIT9

11/22/2024121801069Open ↗

12/09/2022122566204Open ↗

12/01/2022122566204Open ↗

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▸BISCOST AFFIDAVIT (FINAL): PW33

10/03/2025121532582Open ↗

12/02/2024121801069Open ↗

01/02/2023122566204Open ↗

▸BISHIC LICENSE OR AFFIDAVIT1

05/30/2013121532582Open ↗

▸BISCOST AFFIDAVIT ESTIMATE: (PW3)1

01/16/2025124041401Open ↗

▸Filing & Intake Forms13

▸BISEFILING COVER SHEET6

11/19/2024124041401Open ↗

11/12/2015122566204Open ↗

10/08/2013121801069Open ↗

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▸BISADDITIONAL INFORMATION6

04/24/2025121532582Open ↗

03/11/2025121532582Open ↗

01/17/2025124041401Open ↗

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▸BISBOROUGH INTAKE FORM1

02/21/2018122566204Open ↗

▸Other Documents5

▸BISEXTERNAL FORMS - SUPPORTING DOCUMENTATION3

03/11/2025121532582Open ↗

09/05/2024121532582Open ↗

05/30/2023121532582Open ↗

▸DOB NOWProof of Historic Building1

08/13/2026M00952471-I1Open ↗

▸DOB NOWAdjoining Owners Notification1

08/13/2026M00952471-S3Open ↗