What Is a Triple Net Lease (NNN)?
By Markets & Investing DeskUpdated Nov 10, 2026
Definition
A triple net lease (NNN) is a commercial lease where the tenant pays base rent plus the property's taxes, building insurance and maintenance, usually in exchange for lower base rent.
Key takeaways
- Utilities are usually the tenant's cost too, but they are not one of the three nets.
- Multi-tenant landlords bill monthly estimates, then reconcile them against actual costs at year end.
- A double net lease shifts taxes and insurance to the tenant, while the landlord keeps maintenance.
- A nationally rated tenant generally supports a lower cap rate, and so a higher price, than a local operator.
A triple net lease (NNN) is a commercial lease in which the tenant pays base rent plus the property’s three main operating costs: property taxes, building insurance and maintenance. The “three nets” are those three expense categories. Because the tenant covers them, the landlord’s rent arrives “net” of operating costs, and the base rent is usually lower than under a lease where the landlord pays those bills. The trade-off is risk: if taxes, premiums or repair bills rise during the lease, the tenant pays the increase.
How a triple net lease works
In commercial real estate, a “net” lease is any lease where the tenant pays some or all of the costs of owning the property. A triple net lease is the version where the tenant takes on all three major categories:
- Property taxes: the real estate taxes assessed on the land and building.
- Insurance: the building’s property and often liability coverage.
- Maintenance: repairs, upkeep and, in multi-tenant buildings, common area maintenance (CAM) such as parking lots, landscaping, lighting and shared hallways.
Utilities are normally the tenant’s responsibility as well, though they are not counted among the three nets.
These costs reach the tenant in one of two ways. In a single-tenant building, the tenant may pay the tax bill, buy the insurance policy and hire contractors directly. In a multi-tenant property such as a shopping center, the landlord usually pays the bills and charges each tenant its pro rata share as a monthly estimate based on projected expenses, then compares the estimates with actual costs at year end. The tenant pays any shortfall or receives a credit, a step called reconciliation.
The lease defines exactly what counts as a pass-through expense. A clause covering “maintenance and repairs” can leave a tenant paying for a parking lot resurface, while a lease that carves out structural items keeps the roof and foundation with the landlord.
Single, double and triple net leases compared
Net leases differ by how many costs move to the tenant. Gross leases sit at the other end, with the landlord paying operating costs out of a higher rent.
| Lease type | Tenant pays in addition to base rent | Landlord keeps |
|---|---|---|
| Gross lease | Usually nothing beyond rent (sometimes utilities) | Taxes, insurance, maintenance |
| Single net (N) | Property taxes | Insurance, maintenance |
| Double net (NN) | Property taxes and insurance | Maintenance |
| Triple net (NNN) | Taxes, insurance and maintenance | Typically major structural items, depending on the lease |
| Absolute net | Everything, including roof, structure and casualty rebuilding | Ownership, little or no expense risk |
An absolute net lease, sometimes called a bondable lease, carries the most tenant expense risk, and landlord income under it can come close to a fixed payment stream. Labels are not standardized, so two leases both called “NNN” can split structural repairs differently.
How NNN payments are calculated
Total occupancy cost under a triple net lease has two parts:
Total rent = base rent + NNN charges (taxes + insurance + maintenance/CAM)
Both parts are usually quoted per square foot per year, so listings commonly show a figure such as “$X/sq ft + NNN.”
Hypothetical example (figures are illustrative, not market rates): a tenant leases 10,000 square feet in a 40,000-square-foot retail center, giving it a 25% pro rata share. Base rent is $20 per square foot per year.
| Item | Building total | Tenant share (25%) |
|---|---|---|
| Base rent ($20 × 10,000 sq ft) | n/a | $200,000 |
| Property taxes | $120,000 | $30,000 |
| Insurance | $40,000 | $10,000 |
| Common area maintenance | $80,000 | $20,000 |
| Total annual cost | $260,000 | |
| Monthly payment | $21,666.67 |
The NNN charges here work out to $6 per square foot. If the property tax bill rises to $136,000 the next year, the tenant’s share climbs from $30,000 to $34,000. That $4,000 increase is collected through reconciliation, even though base rent never changed. Where one tenant occupies the whole building, the landlord may simply add up the annual taxes, insurance and maintenance and divide by 12 to set the monthly charge.
Why investors buy triple net properties
Triple net properties appeal to investors who want predictable income with limited day-to-day management. Typical examples are free-standing buildings leased to pharmacies, banks, restaurant chains and retailers, along with office and industrial properties. Many are leased to a single tenant on 10- to 15-year terms with scheduled rent increases that can help offset inflation over the term.
Pricing usually runs through the cap rate, the property’s net operating income divided by its value or price. Because a credit-strong tenant makes the income more dependable, the tenant’s credit rating has a large effect on the cap rate buyers accept. Under the same lease terms, a nationally rated tenant generally supports a lower cap rate, and so a higher price, than a small local operator.
Two tax and access points come up often:
- 1031 exchanges: under Section 1031 of the Internal Revenue Code, a U.S. investor who sells a property held for investment can defer capital gains tax by reinvesting in like-kind real property, such as another NNN property. The tax is deferred, not eliminated.
- Investor access: some private net lease offerings are open only to accredited investors. The SEC’s thresholds include a net worth above $1 million excluding the primary residence, or income above $200,000 ($300,000 jointly). Smaller investors can get exposure through real estate investment trusts (REITs) that specialize in net leased properties.
Benefits and drawbacks
For tenants, the main advantages are lower base rent and control. The tenant decides how the property is maintained and how it looks, can choose its insurer in a single-tenant building, and can protest the property tax assessment if it seems too high. The drawbacks are cost uncertainty and surprise repairs. A tax reassessment, a jump in insurance premiums or a failed HVAC system can push total occupancy cost well above budget. Inflated expense estimates are another risk if the tenant does not review reconciliations.
For landlords, a triple net lease offers steady income with minimal operating responsibilities. The landlord’s position, however, is only as secure as the tenant. Finding creditworthy tenants willing to accept these terms can take time. If a single-tenant building goes vacant, the landlord loses rent and has to pay the taxes, insurance and upkeep alone until a new tenant signs.
Negotiating a triple net lease
Because the tenant is taking on the landlord’s expense risk, the base rent is the main bargaining lever. Tenants also commonly negotiate:
- Caps on controllable expenses, such as CAM increases limited to a set percentage per year (taxes and insurance are often excluded from caps).
- Exclusions, for example structural repairs, roof replacement or capital improvements that benefit the landlord beyond the lease term.
- Audit rights, which let the tenant inspect the landlord’s expense records behind the reconciliation.
- Clear definitions of what maintenance includes and how pro rata shares are measured.
Do apartment renters pay net lease costs?
Generally, no. Net leases are a commercial arrangement. Residential tenants may pay some utilities and are often encouraged or required to carry renters insurance, which covers their own belongings and liability. The residential landlord typically pays the building’s property insurance and real estate taxes and builds those costs into the rent.
The Bottom Line
Commercial tenants weighing a triple net lease trade lower base rent for exposure to rising taxes, premiums and repair bills, so lease definitions, expense caps, exclusions and audit rights matter. Investors get steady income with little management, but that income depends on the tenant's credit, and a vacancy leaves the landlord paying every operating cost alone.
