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.
Plan a similar project
Want work like this done at your place?
Tell us what you have in mind. We scope it, price it against work like this in Manhattan, and lines up the right contractor. You approve; we handle the back-and-forth.