Neighborhoods › Chelsea-Hudson Yards › Building 1083573

Interior renovation: Seabury hall - removal and installation of interior…, est. $4.7M

418 West 21 Street, Manhattan 10271 · Permit Entire

DOB description

M01320412-I1: SEABURY HALL - REMOVAL AND INSTALLATION OF INTERIOR PARTITONS AND FINISHES. NEW ELEVATOR SHAFT WALLS. NO CHANGE IN USE, EGRESS OR OCCUPANCY.
M01320412-S4: SEABURY HALL - REMOVAL AND INSTALLATION OF MECHANICAL DUCTWORK AND EQUIPMENT.
M01320412-P1: SEABURY HALL - REMOVAL AND INSTALLATION OF INTERIOR PARTITONS AND FINISHES. NEW ELEVATOR SHAFT WALLS. NO CHANGE IN USE, EGRESS OR OCCUPANCY.
M01320412-P5: SEABURY HALL - REMOVAL AND INSTALLATION OF INTERIOR PARTITONS AND FINISHES. NEW ELEVATOR SHAFT WALLS. NO CHANGE IN USE, EGRESS OR OCCUPANCY.
M01320412-P2: SEABURY HALL - STRUCTURAL WORK INCLUDING STEEL FRAMING, SLAB ON METAL DECK, AND CMU WALLS TO SUPPORT A PROPOSED ELEVATOR SHAFT AND MECHANICAL OPENINGS. ADDITIONAL WORK INTHE ATTIC INCLUDES METAL GRATING FOR MAINTENANCE ACCESS.
M01320412-S1: SEABURY HALL - STRUCTURAL WORK INCLUDING STEEL FRAMING, SLAB ON METAL DECK, AND CMU WALLS TO SUPPORT A PROPOSED ELEVATOR SHAFT AND MECHANICAL OPENINGS. ADDITIONAL WORK INTHE ATTIC INCLUDES METAL GRATING FOR MAINTENANCE ACCESS.
M01320412-P4: SEABURY HALL - FOUNDATION FOR NEW ELEVATOR PIT.
M01320412-S2: SEABURY HALL - FOUNDATION FOR NEW ELEVATOR PIT.
M01320412-S5: SEABURY HALL - MODIFICATION AND INSTALLTION OF PLUMBING FIXTURES.
M01320412-S6: SEABURY HALL - MODIFICATION AND INSTALLATION OF SPRINKLER HEADS.
M01320412-S7: Installation of temporary support system at existing chimney as per plans.

Status timeline

• Dec 3, 2025 — New job filed (Permit Entire) M01320412-I1
• Dec 15, 2025 — New job filed (Permit Entire) M01320412-S1
• Jan 13, 2026 — New job filed (Permit Entire) M01320412-S4
• Jan 13, 2026 — New job filed (Permit Entire) M01320412-S5
• Jan 13, 2026 — New job filed (Permit Entire) M01320412-S6
• Jan 28, 2026 — New job filed (Permit Entire) M01320412-S2
• Feb 16, 2026 — Permit issued — work can start (General Construction) M01320412-I1
• Feb 17, 2026 — Permit issued — work can start (Structural) M01320412-S1
• Mar 18, 2026 — New job filed (Approved) M01320412-P1
• Mar 30, 2026 — Permit issued — work can start (Foundation) M01320412-S2
• Apr 7, 2026 — New job filed (Permit Entire) M01320412-S7
• Apr 13, 2026 — Permit issued — work can start (Structural) M01320412-S7
• Apr 14, 2026 — Permit issued — work can start (Permit Entire) M01320412-S7
• Apr 22, 2026 — Permit issued — work can start (Plumbing) M01320412-S5
• Apr 23, 2026 — Permit issued — work can start (Permit Entire) M01320412-S5
• Apr 29, 2026 — Permit issued — work can start (Sprinklers) M01320412-S6
• Apr 30, 2026 — Permit issued — work can start (Permit Entire) M01320412-S6
• May 4, 2026 — New job filed (Approved) M01320412-P4
• May 6, 2026 — Permit issued — work can start (Mechanical Systems) M01320412-S4
• May 7, 2026 — Permit issued — work can start (Permit Entire) M01320412-S4
• May 17, 2026 — Plans approved (Approved) M01320412-P1
• May 28, 2026 — Plans approved (Approved) M01320412-P4
• May 28, 2026 — Permit issued — work can start (Permit Entire) M01320412-S2
• Aug 27, 2026 — New job filed (Approved) M01320412-P2
• Aug 31, 2026 — New job filed (Approved) M01320412-P5
• Sep 17, 2026 — Plans approved (Approved) M01320412-P2
• Sep 17, 2026 — Permit issued — work can start (Permit Entire) M01320412-S1
• Sep 17, 2026 — Plans approved (Approved) M01320412-P5
• Sep 17, 2026 — Permit issued — work can start (Permit Entire) M01320412-I1

Work permits

Map