Office Interior Renovation at 645 Madison Avenue, Manhattan
645 MADISON AVENUE, MANHATTAN, 10022 · Upper East Side-Carnegie Hill
What was permitted
Businesses and property owners in the Upper East Side-Carnegie Hill neighborhood can examine the permit for interior renovations at 645 Madison Avenue. This project involves an office build-out, as detailed in the accompanying plans.
The permit for this significant interior renovation was issued on April 29, 2026, with an estimated cost of $700,000. SENTINEL BUILDERS, LLC is the General Contractor for this extensive office build-out.
A substantial $700,000 interior renovation for an office build-out on Madison Avenue, Manhattan, indicates significant commercial construction costs in prime real estate areas.
What it cost
Issued
April 29, 2026
Expires
July 23, 2026
License
General Contractor
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Filed by SENTINEL BUILDERS, LLC · 6 permits across 4 neighborhoods
View the official permit record
Tracking number, work description, cost, and dates
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View the official permit record
Tracking number, work description, cost, and dates
| Tracking Number | 970568725 |
| Work Permit # | M01385453-I1-GC |
| Job Filing Number | — |
| Work Type | General Construction |
| Status | Permit Issued |
| Job Description | APPLICATION FILED HEREWITH FOR INTERIOR RENOVATIONS for office build out as per plans filed herewith. |
| Floor / Unit | Floor Number(s) 016 through 016 |
| Estimated Cost | $700,000 |
| Approved | April 27, 2026 |
| Issued | April 29, 2026 |
| Expires | July 23, 2026 |
| BBL | — |
| BIN | — |
Property Owner
NG 645 Madison Ave LLC
Keith Colton