What Is a Triple Net Lease? NNN Explained for CRE

A triple net lease, written NNN, is a commercial lease where the tenant pays the three main property operating costs (property taxes, building insurance, and common area maintenance) on top of base rent and utilities. The landlord collects a rent that is closer to net income because the variable operating costs flow through to the tenant. NNN is the standard structure for industrial, warehouse, and single-tenant retail real estate in the United States.

If you own, buy, or finance commercial property, the lease structure decides how much of your gross rent you actually keep. A triple net lease moves the unpredictable costs (taxes that get reassessed, insurance premiums that climb, repairs that come due) onto the tenant, which is why investors prize it for steady, predictable cash flow. But the word triple net hides a lot of detail. Two NNN leases on the same building can pass through very different costs depending on the caps, exclusions, and repair carve-outs buried in the document. This guide walks through what NNN means, who pays what, and the fields that matter when you read one.

What does triple net mean?

Triple net means the tenant covers the three nets: net property taxes, net building insurance, and net common area maintenance (CAM). The base rent is quoted separately and lower than it would be on a gross lease, because the operating costs sit on top of it rather than inside it. The phrase comes from how each cost is treated as a separate pass-through line the tenant reimburses, either monthly as an estimate that is reconciled annually or directly as bills come due.

What does a tenant pay in a triple net lease?

In a triple net lease the tenant pays base rent plus its pro-rata share of property taxes, building insurance, and common area maintenance, plus its own utilities and interior upkeep. On a single-tenant building the tenant often pays essentially all property costs. On a multi-tenant warehouse or shopping center, each tenant pays a share based on its square footage. The pass-through is usually estimated monthly and trued up once a year, so the tenant either owes a balance or gets a credit after the landlord reconciles actual costs.

What is the difference between a gross lease and a triple net lease?

In a gross lease the landlord pays the operating costs out of a single all-in rent, so the tenant has one predictable number and the landlord absorbs cost swings. In a triple net lease the tenant pays a lower base rent plus the actual taxes, insurance, and CAM, so the tenant carries the cost risk and the landlord keeps a cleaner net income. A modified gross lease sits between the two, splitting some costs and passing through others, often using a base-year stop. The structure changes who wins when costs rise, which is why it is one of the first things to confirm when you read a lease.

Who pays for repairs in a triple net lease?

It depends on the specific clause, which is exactly why the repair language has to be read carefully. Many triple net leases push routine maintenance and even roof, HVAC, and parking-lot upkeep onto the tenant, but the carve-outs vary: structural elements, the slab, and foundation often stay with the landlord, and some leases cap or amortize major capital replacements. A single missed carve-out can leave a six-figure roof or HVAC replacement with the owner instead of the tenant, so the repair split is one of the highest-stakes fields in any industrial abstract.

How do you calculate triple net charges?

Add the building's annual property taxes, insurance, and CAM, then multiply by the tenant's pro-rata share (its square footage divided by the building's leasable square footage) to get that tenant's annual NNN charge. Divide by twelve for the monthly estimate. For example, on a 100,000 square foot warehouse with 500,000 dollars of total taxes, insurance, and CAM, a tenant in 20,000 square feet carries 20 percent, or 100,000 dollars a year, about 8,333 dollars a month, on top of base rent. Caps and exclusions in the lease can lower the tenant's share, which is why the abstract should capture them.

What is a NNN lease in industrial real estate?

In industrial real estate, a NNN lease is the default. Warehouse, distribution, and logistics tenants typically take long terms (often five to ten years or more) and pay base rent plus all three nets, plus their own equipment and interior costs. Because the term is long and the building is cost-intensive, the recovery structure and the repair obligations are where the real economics live. Owners read those terms across the whole portfolio to make sure recoveries are billed correctly and capital liability is priced in. That portfolio read is the job of lease abstraction for industrial and logistics leases, which pulls the NNN pass-through terms, caps, repair split, and options into one consistent abstract.

Is a triple net lease good for the landlord or the tenant?

A triple net lease favors the landlord on cost predictability: the owner collects a stable net rent and passes the variable, rising costs to the tenant, which is why NNN single-tenant assets trade as bond-like investments. The tradeoff for the tenant is a lower base rent and full control of how the space is maintained. Neither side is automatically better off; it comes down to the caps, exclusions, and repair carve-outs in the actual document, which is why both sides should abstract the lease before they sign or buy.

Reading NNN terms across a portfolio

One triple net lease is manageable by hand. A portfolio of them is not, because each lease passes through costs a little differently and the differences are exactly what move net operating income. Pulling the recovery structure, caps, exclusions, repair obligations, and options into a consistent abstract is what lets an owner bill recoveries correctly and a buyer price the asset accurately. The mechanics of truing up the pass-throughs each year are covered in how to do a CAM reconciliation, and the full field list a complete abstract carries is in the commercial lease abstract template. For the tool that reads every lease and links each field back to its clause, see our lease abstraction software.

A few adjacent tasks come up once the NNN terms are in hand. When it is time to put the lease in front of the parties, an affordable way to send the lease for e-signature keeps the execution clean. The pass-through taxes, insurance, and CAM bills the tenant reimburses still have to be processed and paid, which is where accounts payable automation handles the operating-cost invoices behind a NNN building. And when a lender underwrites the building as collateral, the same lease data feeds its loan underwriting analysis of the asset's net income.

The takeaway: triple net is not a single number, it is a structure with a lot of variable detail. Read the caps, the exclusions, and the repair carve-outs before you assume what net you actually keep.