NN vs NNN vs Absolute Net: Who Really Insures the Building?

If you own or are buying a single-tenant commercial property, the lease is what decides who's obligated to insure the building. Not your broker, not the lender. Get the lease type wrong and you'll either buy coverage you don't owe or, worse, leave a gap that both the lender and the lease expect you to fill. So let's walk through how the three common net-lease structures actually work when it comes to insurance.

The quick version

"Net" refers to what the tenant pays on top of base rent. The more "nets," the more the tenant carries.

Single net (N): tenant pays base rent plus property taxes. The landlord handles insurance and maintenance.
Double net (NN): tenant pays taxes and insurance, but the landlord keeps responsibility for the roof, the structure, and usually the building's property coverage.
Triple net (NNN): tenant pays taxes, insurance, and maintenance, including roof and structure.
Absolute net: a "true" NNN where the tenant is on the hook for essentially everything, including major structural repair and rebuilding after a loss. The landlord is close to a pure mortgage holder.

The question that actually matters for insurance is simple: who carries the property (building) coverage, and who's named on it?

Why NN gets misread as NNN constantly

On paper, NN and NNN look almost the same, because the tenant is reimbursing insurance either way. The real difference is which insurance, and who controls it.

The tell is the roof and structure. If the landlord carries and controls the building's fire-and-extended coverage, or is responsible for the roof and structure, it's a double net (NN). That's true even when the tenant reimburses the premium. In a genuine NNN, the tenant usually procures the property coverage directly and owns the structural responsibility.

Why does this matter so much? On an NN deal, you (the owner) have to place and control the building policy. The tenant reimbursing you doesn't change who has to buy it. On an NNN, you may only need to confirm the tenant's coverage and get yourself named as an additional insured and loss payee. Buy the wrong posture and you've either got a coverage gap or a double-paid premium.

What each structure means for your policy

NN, landlord carries the building. You place a commercial property policy at full replacement cost, name your lender as mortgagee/loss payee, and bill the premium back to the tenant per the lease. You also carry your own liability. This is the most hands-on structure from an insurance standpoint, and it's the one investors most often misjudge when they assume "net lease means the tenant handles it."

NNN, tenant carries the building. You confirm the tenant's property limits meet the lease and the lender's requirements, get named as additional insured on liability and loss payee/mortgagee on property, and keep your own liability plus (often) a contingent or difference-in-conditions layer in case the tenant's coverage lapses.

Absolute net. The closest thing to hands-off, but you still verify the tenant's coverage, protect your lender's position, and confirm what happens on a total loss. If the tenant is obligated to rebuild, your policy strategy looks very different than if you are.

The one thing to always confirm

Read the lease's insurance article and answer three questions. Who must carry the building/property coverage? At what limit (replacement cost)? Who must be named, and in what role? Everything else follows from those answers. And if a lease just says "tenant maintains insurance" without spelling out property versus liability, that's not an answer. It's a flag to dig deeper.

Where we come in

When you send us a lease, we read the insurance article the way an underwriter will and classify the structure accordingly, including the sneaky NN-dressed-as-NNN cases where the landlord actually carries the building. That tells you what you need to place versus what you only need to verify, so you're not over-buying or leaving a hole the lender will catch.