Neighborhoods › Midtown-Times Square › Building 1035727
Interior renovation: Alt-co to propose increased occupant load for offices on…, est. $10K
520 Madison Avenue, Manhattan 10001 · Permit Entire
| Job | M01355353 (6 filings: I1, S1, S2, S3, S4, S5) · Alteration CO |
|---|---|
| Category | interior renovation |
| Estimated cost | $10,000 |
| Scale | 43 → 43 stories; 1,058 sq ft |
| Work types | General Construction |
| Filed | Mar 22, 2026 |
| Professional | Perkins and Will |
| Building | BIN 1035727 · BBL 1012890014 |
| Official record | DOB NOW job M01355353 |
DOB description
M01355353-I1: ALT-CO to propose increased occupant load for offices on the 28th & 29th floors. No change in use, egress, bulk or height. Minor demo to include but not limited to removal of walls, doors/frames, flooring, ceiling and finishes in the areas indicated.
M01355353-S1: REMOVAL AND INSTALLATION OF INTERIOR NON-LOAD BEARING PARTITIONS, DOORS, FRAMES, CEILINGS, MILLWORK, LIGHTING, FLOORING, AND RELATED FINISHES. INSTALLATION OF CONVENIENCE STAIR. NO CHANGE IN USE, EGRESS OR OCCUPANCY UNDER THIS APPLICATION.
M01355353-S2: Installation of air conditioning system, condensate pump, condenser water pumps, terminal boxes, air outlets and related ductwork/piping as per plans filed herewith. No change in use, egress or occupancy under this application.
M01355353-S3: Installation of plumbing fixtures and related piping as per plans filed herewith. No change in use, egress or occupancy under this application.
M01355353-S4: Installation of full floor sprinkler coverage, branch piping and to connect to existing base building sprinkler system. Removal of existing temporary core sprinkler protection. No change in use, egress or occupancy under this application.
M01355353-S5: Structural modifications associated with partial demo of slab for new interconnecting stair opening as per plans filed herewith. No change in use, egress or occupancy under this application.
Status timeline
- Mar 22, 2026 — New job filed (Permit Entire) M01355353-I1
- Mar 22, 2026 — New job filed (Permit Entire) M01355353-S1
- Mar 22, 2026 — New job filed (Permit Entire) M01355353-S2
- Mar 22, 2026 — New job filed (Permit Entire) M01355353-S3
- Mar 22, 2026 — New job filed (Permit Entire) M01355353-S4
- Mar 22, 2026 — New job filed (Permit Entire) M01355353-S5
- May 26, 2026 — Permit issued — work can start (General Construction) M01355353-S1
- May 26, 2026 — Permit issued — work can start (Structural) M01355353-S5
- May 27, 2026 — Permit issued — work can start (Mechanical Systems) M01355353-S2
- Jul 26, 2026 — Permit issued — work can start (Plumbing) M01355353-S3
- Jul 26, 2026 — Permit issued — work can start (Sprinklers) M01355353-S4
- Jul 27, 2026 — Permit issued — work can start (Permit Entire) M01355353-S4
- Jul 27, 2026 — Permit issued — work can start (Permit Entire) M01355353-S3
- Sep 29, 2026 — Permit issued — work can start (Permit Entire) M01355353-S5
- Sep 29, 2026 — Permit issued — work can start (Permit Entire) M01355353-S2
- Sep 29, 2026 — Permit issued — work can start (Permit Entire) M01355353-S1
- Oct 5, 2026 — Permit issued — work can start (General Construction) M01355353-I1
- Oct 6, 2026 — Permit issued — work can start (Permit Entire) M01355353-I1
Work permits
| Permit | Work | Status | Issued | Expires |
|---|---|---|---|---|
| M01355353-I1-GC | General Construction | Permit Issued | Oct 5, 2026 | Sep 29, 2027 |
| M01355353-S3-PL | Plumbing | Permit Issued | Jul 26, 2026 | Dec 30, 2026 |
| M01355353-S4-EW-SP | Sprinklers | Permit Issued | Jul 26, 2026 | May 17, 2027 |
| M01355353-S2-MS | Mechanical Systems | Permit Issued | May 27, 2026 | Sep 28, 2027 |
| M01355353-S1-GC | General Construction | Permit Issued | May 26, 2026 | Sep 28, 2027 |
| M01355353-S5-ST | Structural | Permit Issued | May 26, 2026 | Sep 28, 2027 |
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