A triple-net lease shifts the majority of property operating costs to the tenant. In exchange for lower base rent, the tenant becomes responsible for property taxes, insurance, and maintenance -- sometimes all three, sometimes only portions depending on how the lease is structured. The financial exposure in an NNN lease is substantially larger than the base rent figure suggests, and that exposure is defined by the specific language in the lease document.
Before signing an NNN lease, tenants need to understand exactly what they are assuming. This 12-item checklist covers the key areas to review.
1. Base Rent Per RSF and Escalation Schedule
The base rent is the starting point, but in a long-term NNN lease, the escalation schedule is at least as important. Small differences in annual escalation percentages compound significantly over a 10-year or 15-year term.
What to check: Confirm the base rent per rentable square foot. Identify the escalation mechanism -- fixed percentage increases, CPI-linked adjustments, or fair market rent resets at option periods. Calculate the effective rent over the full lease term using each year's stated rate. A lease with 3% annual fixed escalations and one with CPI-linked adjustments subject to the same 3% floor produce very different outcomes in a high-inflation environment.
2. Property Tax Responsibility and Appeal Rights
In a true NNN lease, the tenant pays property taxes either directly or as a reimbursement to the landlord. The scope of this obligation and the tenant's rights regarding tax appeals have significant financial consequences.
What to check: Confirm whether the tenant pays taxes directly or reimburses the landlord. Identify whether the tenant's obligation is limited to increases above a base year assessment or covers the full tax bill. Most importantly, confirm whether the lease gives the tenant the right to participate in or initiate property tax appeals. A tenant paying full property taxes without the right to contest assessments has no recourse against an inflated assessment. If the landlord retains sole control over tax appeals, the lease should require the landlord to pursue appeals upon written tenant request and pass through the savings.
3. Insurance Type and Amount Requirements
NNN leases require tenants to maintain specified insurance coverage, and the requirements are often more detailed and more expensive than tenants anticipate when reviewing the base rent.
What to check: Identify every insurance type the lease requires -- commercial general liability, property damage, business interruption, workers' compensation, umbrella coverage. Note the minimum coverage amounts and whether those amounts reset on a schedule or require consent to adjust. Confirm that landlord-required coverage types and amounts are obtainable at reasonable cost for your business type and location. Some landlords require umbrella liability coverage of $5 million or more, which may significantly exceed what a smaller tenant would otherwise carry.
4. Roof and Structural Maintenance Responsibility
In a modified NNN lease or a gross lease, the landlord typically retains responsibility for roof and structural repairs. In a true NNN lease, the tenant may assume responsibility for the roof and building structure -- an obligation that can be extremely costly if the building requires significant work during the lease term.
What to check: Identify who bears responsibility for roof maintenance, roof replacement, structural walls, foundation, and building envelope. If the tenant is responsible for roof replacement, review the roof's age and condition before signing -- a 15-year-old roof at lease commencement may require full replacement within the lease term at the tenant's expense. If the lease assigns roof responsibility to the tenant, negotiate a roof reserve or a representation about roof condition at commencement.
5. HVAC Responsibility
HVAC systems are among the most expensive maintenance items in a commercial property. NNN leases frequently assign HVAC maintenance and replacement to the tenant, which can result in unexpected capital costs during the lease term.
What to check: Confirm whether the tenant is responsible for HVAC maintenance, repair, and replacement. If yes, review the age and condition of all HVAC units at commencement. Negotiate a representation from the landlord about equipment condition, a warranty period during which the landlord bears responsibility for equipment that fails, or a cap on the tenant's annual HVAC replacement obligation. Some leases cap the tenant's HVAC responsibility at a defined dollar amount per unit per year, with costs above the cap borne by the landlord.
6. Parking Lot Maintenance
Parking lot repaving, seal coating, and line repainting are significant expenses in a stand-alone retail NNN lease. Unlike office or industrial properties where parking costs are typically shared, single-tenant NNN properties often assign the entire parking obligation to the tenant.
What to check: Identify who is responsible for parking lot maintenance and repaving. If the tenant bears this cost, inspect the parking lot condition and confirm the landlord's representation about its condition at commencement. A parking lot that needs repaving within the first three years of a 10-year lease at tenant expense is a material cost that should be reflected in the base rent negotiation or as a landlord obligation at commencement.
7. Utilities
NNN leases almost uniformly assign utility costs to the tenant, but the scope of that obligation varies. In multi-tenant properties, allocation methodologies matter. In single-tenant properties, the key issue is whether utilities are metered separately to the tenant's space.
What to check: Confirm that utilities are separately metered to your space. In a multi-tenant property, confirm the allocation methodology for shared utilities (common area electricity, water, and HVAC for shared spaces). If utilities are not separately metered, request that separate meters be installed as a lease condition or negotiate a fair allocation formula.
8. CAM Definition and Exclusions
Even in a "true" NNN lease with direct tax and insurance payment by the tenant, there may be a CAM component for common area costs in multi-tenant properties. The definition of what is included and excluded determines the tenant's actual exposure.
What to check: Read the CAM definition and the exclusions list carefully. Look for exclusions of capital expenditures, management fee caps, and administrative fee limits. For single-tenant properties, confirm whether there are any shared costs that pass through in addition to base rent and direct expense obligations. The absence of an exclusion list in an NNN lease is a red flag -- it means the landlord may be able to pass through virtually any expense.
9. Management Fee Cap
In multi-tenant NNN properties, property management fees pass through to tenants as part of CAM. The management fee rate and any cap on that rate directly affect the tenant's total occupancy cost.
What to check: Identify the management fee rate and the base on which it is calculated (percentage of gross revenue or operating expenses). Confirm whether the fee is subject to a cap. For properties managed by a landlord affiliate, confirm whether the lease caps the management fee at market rate and whether the landlord must demonstrate that the fee reflects arm's-length pricing.
10. Landlord Approval for Major Repairs
In most NNN leases, the tenant makes operational decisions for the property on a daily basis. But for major repairs or replacements above a defined dollar threshold, many leases require landlord consent -- which can delay necessary work and create liability exposure if the landlord withholds consent unreasonably.
What to check: Identify any repair or alteration approval requirements and the dollar threshold that triggers them. Confirm that the lease includes a provision requiring the landlord to act on approval requests within a defined period (typically 10 to 30 days) and that silence is deemed approval after the period expires. Also confirm who has authority to hire contractors and whether the landlord has any approval rights over contractors or vendors.
11. Termination or Kick-Out Rights
A 10-year or 15-year NNN lease is a long commitment. Changes in business performance, market conditions, or corporate strategy may make it necessary to exit before the term expires. Kick-out rights give the tenant a contractual way to do that.
What to check: Confirm whether the lease includes any termination or kick-out right, and if so, the conditions for exercising it (sales performance thresholds, co-tenancy conditions, or pure option rights). Note the notice requirements, termination fee structure, and any waiting period before the right becomes exercisable. A lease with no termination right and no kickout clause leaves the tenant fully exposed to the remaining rent obligation in a default scenario.
12. Landlord Obligations at Commencement
What condition is the landlord delivering the premises in? The answer has real financial consequences in an NNN lease where the tenant is responsible for ongoing maintenance from day one.
What to check: Confirm the delivery condition the landlord is obligated to provide at commencement -- what systems must be in working order, what representations are made about the age and condition of major building components, and what the landlord must complete before the rent commencement date. Get representations about the condition of the roof, HVAC, electrical, plumbing, and parking lot in writing. Representations made in side letters or emails that are not incorporated into the lease may be difficult to enforce after signing.
The NNN Lease Bottom Line
The base rent in an NNN lease is only one component of total occupancy cost. A thorough review of these 12 items before signing identifies the full cost exposure and reveals where the negotiating leverage lies. A lease that looks attractively priced on base rent can become significantly more expensive when property taxes are rising, HVAC systems are aging, and the CAM exclusions list is thin.
A complete lease abstract capturing all of these provisions in structured form -- base rent, escalation schedule, tax obligation, insurance requirements, maintenance responsibilities, CAM definition, management fee cap, and termination rights -- is the starting point for every NNN lease analysis. That data does not change after the lease is signed, but your ability to use it depends on having it organized and accessible.