A triple net lease (NNN lease) is a commercial lease structure where the tenant pays base rent plus all three of the property’s major operating costs: property taxes, property insurance, and maintenance. The “triple” refers to those three added expense categories, on top of the base rent, not three separate leases or three separate landlords. It’s the most common structure for freestanding retail, industrial space, and single-tenant net-lease properties.
If you’re on a real estate team evaluating a triple net lease, the real work is modeling what those three “nets” actually cost over the lease term, not just the base rent quoted in the listing. If you’re on a finance team, an NNN structure changes which costs flow through as pass-throughs versus what shows up in your ASC 842 lease liability calculation. Here’s the full breakdown.
What Does Triple Net Lease Mean?
A triple net lease shifts the three primary costs of property ownership, property taxes, insurance, and maintenance, from the landlord to the tenant, on top of base rent. In exchange, tenants typically get a lower base rent than they’d pay under a gross lease, since the landlord isn’t pricing in the cost and risk of covering those expenses itself.
Single, Double, and Triple Net Leases: What’s the Difference?
“Net lease” is the broader category; the number of “nets” tells you how many of the three major cost categories the tenant is responsible for.
Single net leases carry the least tenant risk of the three; triple net leases carry the most, and price the base rent accordingly.
Triple Net Lease vs. Other Commercial Lease Types
Beyond the net-lease family, triple net leases sit alongside a few other common commercial structures:
The absolute net lease is worth calling out specifically: it goes a step further than a standard NNN lease by making the tenant responsible for structural repairs and replacements too, things a typical triple net lease still leaves with the landlord. These are usually long, non-cancelable leases signed by investment-grade, single-tenant occupants.
Costs passed from landlord to tenant under any of these structures, taxes, insurance, CAM, are often called pass-through expenses. Whether a given lease is NNN, modified gross, or percentage largely comes down to which of those pass-throughs the tenant has agreed to absorb.
Each structure is covered in more depth in our commercial rent structure guide, our breakdown of gross leases, and the full commercial lease types explainer.
A Worked Example: What a Triple Net Lease Actually Costs
Quoted base rent on an NNN lease is only part of the picture. Here’s a realistic annual cost breakdown for a single-tenant retail property:
The base rent alone understates the actual occupancy cost by roughly 44% in this example. That gap is exactly why modeling the full “net” exposure matters more than comparing quoted base rents across properties.
Key Characteristics of a Triple Net Lease
- Lower base rent than a comparable gross lease, since the tenant is absorbing cost and risk the landlord would otherwise price in.
- Predictable landlord income, since the variability of taxes, insurance, and maintenance costs is passed to the tenant.
- Long-term commitments, commonly 10-15 years, often with built-in rent escalations.
- Tenant control, since the tenant handling maintenance directly usually comes with more say over how the space is kept.
Advantages and Disadvantages
What Tenants Should Check Before Signing
Before signing a triple net lease, model the full cost exposure, not just the quoted base rent:
- Property tax escalation history for the specific property, not just the area average
- Required insurance coverage levels and whether you can choose your own carrier
- Maintenance obligations, including whether structural repairs are excluded (standard NNN) or included (absolute net)
- Rent and expense escalation clauses, and whether any caps apply
- Earnings caps that might affect how costs get passed through in later years
Reviewing the lease with legal counsel before signing is standard practice for exactly this reason: the exposure in an NNN lease is in the details, not the headline rent number.
How NNN Leases Affect ASC 842 Accounting
The NNN structure itself doesn’t change how the lease liability and right-of-use asset are calculated under ASC 842; that calculation is still based on the base rent and any fixed payments. What it does affect is classification of the pass-through costs, taxes, insurance, and CAM, which are generally treated as non-lease components (or variable payments, depending on how they’re structured) rather than part of the lease payment stream itself.
That distinction matters operationally: a triple net lease’s true occupancy cost is much higher than what shows up in the ROU asset and lease liability alone, which is exactly why real estate teams evaluating total cost of occupancy and finance teams tracking the ASC 842 balance sheet impact need to be working from the same underlying lease data, not two different slices of it. For the full mechanics of lease vs. non-lease components, see our ASC 842 guide.
Why This Matters for Real Estate and Finance Teams Together
A triple net lease is a good example of why the true cost of a lease and its accounting treatment aren’t the same number. Real estate teams model total occupancy cost, base rent plus taxes, insurance, and CAM, when comparing properties. Finance teams book the lease liability based on the fixed payment stream. Both are right, but if they’re working from different data, the company ends up with two disconnected pictures of what the same lease actually costs.
Occupier keeps lease terms, including the NNN cost components real estate is tracking, and the ASC 842 calculations finance is responsible for, in the same system, so both teams are working from the same underlying lease, not reconciling two separate spreadsheets after the fact.
See how Occupier tracks lease terms and cost exposure together →
Triple Net Lease FAQs
What does triple net lease mean in simple terms? It means the tenant pays base rent plus the property’s taxes, insurance, and maintenance costs, the three “nets,” instead of the landlord bundling those costs into a higher rent.
What’s the difference between a single, double, and triple net lease? The number of “nets” indicates how many of the three major cost categories, taxes, insurance, and maintenance, the tenant is responsible for. Single net is just taxes; double net adds insurance; triple net adds maintenance on top of both.
Is a triple net lease good for tenants? It depends on the tradeoff. Tenants generally get a lower base rent and more control over the space, but they take on the risk of rising taxes, insurance, and maintenance costs over the lease term.
Are triple net leases only for retail properties? No, though they’re most common in freestanding retail and industrial space. NNN structures also show up in office and other single-tenant commercial properties.
What’s an absolute net lease, and how is it different from a triple net lease? An absolute net lease goes further than a standard NNN lease by making the tenant responsible for structural repairs and replacements too, obligations a typical triple net lease usually still leaves with the landlord.
Does a triple net lease change how the lease liability is calculated under ASC 842? Not directly. The lease liability is still based on the fixed rent payments. The pass-through costs, taxes, insurance, CAM, are generally treated separately as non-lease components or variable payments rather than part of that calculation.
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