A triple net lease is a commercial real estate arrangement where the tenant pays base rent plus three categories of property expenses on top of it: property taxes, building insurance, and maintenance costs. The structure, often shortened to NNN, shifts most of the property’s operating costs from the landlord to the tenant and dominates single-tenant commercial properties like freestanding retail stores, pharmacies, and fast-food restaurants. Terms run long. Ten and fifteen years are typical, and the financial dynamics look nothing like a standard office lease where the landlord bundles everything into one monthly payment.
The Three Nets
The “triple net” label points to three distinct expense categories you take on beyond base rent. Each is a cost a landlord would normally absorb under a conventional lease.
Property taxes. You pay the real estate taxes assessed on the leased property. If the local tax authority raises the assessment mid-lease, you absorb the increase. Some leases pass through the entire tax bill; others allocate a proportional share in multi-tenant buildings.
Building insurance. You cover property insurance protecting the physical structure against fire, storms, and other covered losses. Many NNN leases also require general liability insurance and, in some cases, business interruption coverage.
Maintenance and operating costs. This covers upkeep of shared areas like parking lots and landscaping, along with operational expenses such as repairs, trash removal, and property management fees. In single-tenant NNN leases, the tenant handles virtually all day-to-day maintenance of the entire property.
Beyond the three nets, you also cover your own utilities and interior repairs. If a pipe bursts inside your unit or the interior paint is peeling, that’s on you. The upside of all this responsibility is control: you pick your own insurance carrier, maintenance contractors, and service providers, and any savings you negotiate stay with you.
How a Triple Net Lease Compares to Other Commercial Leases
NNN leases sit at one end of a spectrum that measures how much financial responsibility falls on the tenant versus the landlord. Each additional “net” shifts another category of expense across that line, and the base rent drops to reflect it.
- Gross lease (full-service): You pay a single flat rent amount, and the landlord covers taxes, insurance, and maintenance out of that payment. Costs are predictable, but the base rent is higher.
- Modified gross lease: A hybrid. You pay base rent plus some operating expenses, while the landlord picks up the rest. Which costs fall on which side varies by negotiation.
- Single net lease (N): Base rent plus property taxes. The landlord still handles insurance and maintenance.
- Double net lease (NN): Base rent plus property taxes and insurance. The landlord retains maintenance and structural repairs.
- Triple net lease (NNN): Base rent plus all three. The landlord’s remaining obligation is limited to major structural and capital items.
When you’re comparing an NNN offer to a gross lease, the base rent numbers aren’t comparable on their own. Add the estimated taxes, insurance, and CAM charges to the NNN base rent before you make any judgment about which deal is cheaper.
What the Landlord Still Pays For
Even in a triple net lease, the landlord doesn’t walk away entirely. The landlord keeps responsibility for the building’s major structural components: the roof, foundation, exterior walls, and load-bearing elements. Capital expenditures also stay on the landlord’s side. These are large investments that extend the building’s useful life or increase its value, like replacing an entire HVAC system or resurfacing a deteriorating parking lot. The landlord carries the mortgage, owns the land, and bears long-term structural integrity.
The Repair vs. Capital Improvement Gray Area
The single biggest source of disputes in NNN leases is figuring out whether an expense is a routine repair (your problem) or a capital improvement (the landlord’s problem). Patching a few roof leaks is clearly maintenance. Replacing the entire roof is clearly capital. Plenty of expenses fall between those poles, and vague lease language makes things worse.
The general distinction turns on whether the work restores the property to its previous condition or makes it more valuable, longer-lasting, or adapted to a different use. Fixing a leak keeps the roof functional. Replacing the whole roof creates a new asset that will serve the building for decades after your lease ends. A well-drafted lease defines this boundary explicitly, often using a dollar threshold or a useful-life test.
One common negotiating solution is amortization. If a capital replacement benefits you for only part of the asset’s useful life, you pay a proportional share. A new roof with a 30-year lifespan on a lease with five years remaining might mean you cover roughly one-sixth of the cost. Getting that formula into the lease upfront saves both sides from expensive arguments later.
Rent Escalation Over a Long Term
Because NNN leases run for a decade or more, almost every one includes a mechanism for increasing the base rent over time. Three approaches dominate.
- Fixed increases: The lease specifies a set dollar amount or percentage on a schedule, often annually or every few years. A 2% annual bump is predictable but doesn’t track actual inflation.
- CPI adjustments: Base rent rises in proportion to changes in the Consumer Price Index. This ties increases to real economic conditions, but it can produce larger jumps in high-inflation years.
- Fair market value resets: At specified intervals, rent resets to the current market rate for comparable properties. This protects the landlord from below-market lock-in and introduces real uncertainty for the tenant.
Some leases combine methods or add floors and ceilings on annual increases. The escalation clause is one of the most negotiable terms in any commercial lease, and tenants who skip it during negotiations often regret it five years in.
Absolute Net Leases Are Not the Same Thing
An absolute net lease, sometimes called a bondable lease, takes the NNN concept further. Under a standard NNN lease, the landlord still handles roof and structural repairs. Under an absolute net lease, the tenant is responsible for everything, including the roof, foundation, structural elements, and all repairs regardless of cost. You bear every financial risk associated with the property short of owning it.
These leases are called “bondable” because the income stream is predictable enough to back a bond issuance. They’re most common with investment-grade tenants like national pharmacy chains, major banks, and large fast-food franchisors. If you see “absolute net” or “bondable” language in a lease draft, understand that you’re accepting a fundamentally different risk profile than a standard NNN arrangement.
What to Negotiate Before Signing
NNN leases are heavily negotiable, and the tenants who do best are the ones who push on specific provisions before signing rather than assuming the standard form is reasonable.
CAM Caps and Audit Rights
Common area maintenance charges are the most opaque of the three nets. Landlords estimate CAM costs, collect monthly payments, and reconcile at year-end. Without guardrails, those charges can grow significantly. Negotiating a cap on annual CAM increases, whether a fixed percentage or a dollar ceiling, limits your exposure.
Equally important is the right to audit the landlord’s CAM records. If you’re reimbursing actual expenses, you should be able to verify them. Tenants who skip this provision often end up paying inflated management fees or costs that should have been classified as capital improvements.
Assignment and Sublease Rights
A 10- or 15-year commitment is a long time. If your business needs change, you may want to sublease the space or assign the lease to another tenant. Most NNN leases restrict this, typically requiring the landlord’s written consent and financial review of the proposed replacement. Landlords focus on whether the new tenant’s creditworthiness matches yours, since the whole point of the NNN structure is a reliable income stream.
Without reasonable assignment language, you could be locked into paying rent on a space you no longer need for the rest of a decade-long term. Negotiating for the landlord’s consent “not to be unreasonably withheld” gives you flexibility while still protecting the landlord’s legitimate interest in tenant quality.
Tax Treatment for Business Tenants
For business tenants, the expenses paid under an NNN lease are generally deductible as ordinary and necessary business costs. Federal tax law allows a deduction for “rentals or other payments required to be made as a condition to the continued use or possession” of business property where the taxpayer has no ownership equity.1Office of the Law Revision Counsel. 26 USC 162 – Trade or Business Expenses
Property taxes paid under the lease are deductible as additional rent. The IRS treats these payments as part of the cost of using the leased property, not as your own property tax obligation. Insurance premiums paid for coverage on the leased space follow the same logic and are deductible as business expenses. Timing depends on your accounting method: cash-basis taxpayers deduct in the year they pay, while accrual-basis taxpayers deduct when the liability is fixed and determinable.2Internal Revenue Service. Publication 535 – Business Expenses
The total cost of an NNN lease, base rent plus the three nets, is fully deductible as a business operating expense. That partially offsets the higher overall outlay compared to a gross-lease arrangement.
Before You Sign
The lower base rent on an NNN lease can be genuinely attractive, but only if you go in with clear expectations about total occupancy cost. Add up the base rent, estimated taxes, insurance premiums, and CAM charges before comparing an NNN offer to any gross lease alternative. The all-in number is what matters, and it can shift year to year as taxes and insurance premiums change.
The risk side deserves equal attention. A long commitment means you’re on the hook even if your business contracts. Property tax reassessments, rising insurance costs in disaster-prone areas, and unexpected maintenance can all push total costs well above projections. Three practical steps protect you:
- Get at least three years of historical expense data for the property so you can see how taxes, insurance, and CAM have actually moved.
- Have the building independently inspected before signing, especially the roof, HVAC, and parking lot, since those are the most expensive gray-area items.
- Make sure the lease clearly defines who pays for what when something expensive breaks, with specific language on the repair-versus-capital line and an amortization formula for shared costs.
Get those pieces right and the control that comes with an NNN lease can work in your favor. Skip them, and the structure that looked cheaper than a gross lease on day one can cost significantly more by year five.