Certificate of Occupancy: The One Piece of Paper That Can Stall Your Closing

What it is

A certificate of occupancy — you'll hear it called a "CO" — is the piece of paper your local building department issues to say a structure is legally cleared to be occupied and used for a specific purpose. It confirms the building was constructed (or renovated) to code and that the use matches what the zoning and permits allow.

Think of it as the final handshake between the property and the city. Until it's issued, the building isn't supposed to be open for business.

How it plays out in retail net lease

In a single-tenant net-lease deal, you're usually buying a building that's already up and running — a drugstore, a quick-serve restaurant, a bank branch. So the CO already exists. Your job is to confirm it, not create it.

Here's how I look at it. The CO ties three things together: the physical building, the approved use, and the tenant that's actually operating there. When those three line up, you have a clean file. When they don't, you have a problem hiding in plain sight.

The most common trip-ups I see are with new construction and with change-of-use deals. If you're buying a build-to-suit that just delivered, the permanent CO may still be pending — sometimes there's a temporary CO in place while final items get signed off. And if a space was, say, a former sit-down restaurant now being converted to a coffee concept, the use on file may not match what's operating. That gap is exactly the kind of thing that surfaces late and slows a closing.

What to watch for

• New construction with only a temporary CO. A TCO is not a permanent CO. Understand what conditions have to be met, who's responsible, and by when.
• Change of use. If the tenant's use is different from what the building was originally approved for, confirm the CO (or an amended one) reflects the current use.
• Renovations without a fresh CO. Major tenant build-outs often trigger a new or updated CO. Ask whether permits were pulled and closed out.
• Municipal transfer requirements. Some towns require a new CO, a re-inspection, or a resale certificate when a property changes hands. Rules vary widely — check the specific jurisdiction, don't assume.
• Missing paperwork. Older buildings sometimes have no CO on record at all, especially in municipalities that didn't require them decades ago. That's not automatically fatal, but it needs explaining.

How to use it to your advantage

Ask for the CO early — in the LOI stage or the first days of due diligence, not the week before closing. It costs you nothing to request it and a lot to discover it's missing at the eleventh hour.

The mistake I see buyers make is treating the CO as a rubber stamp. Instead, use it as a cross-check. Does the approved use match the tenant operating there? Does the square footage line up with what's in the lease and the offering? A CO that doesn't reconcile with the rest of your file is a thread worth pulling.

If something's off, you have leverage. A pending item, a use mismatch, or a municipal requirement can become a seller obligation, a holdback, or a price conversation — but only if you catch it while you still have the option to walk.

Best case, worst case

Best case:

• Permanent CO on file, use matches the tenant, everything reconciles with the lease.
• Any municipal transfer step is routine and handled well before closing.

Worst case:

• You close, then learn the space was never permitted for its current use — and fixing it lands on you.
• A temporary CO expires with unfinished conditions and no clear party on the hook.

This article is general education, not investment, tax, or legal advice. Verify all details independently with qualified professionals and your local building department before making any decision.