What does triple net (NNN) mean in a commercial lease?

What does triple net (NNN) mean in a commercial lease?

A triple net lease — abbreviated NNN or written as "net net net" — is a lease structure in which the tenant is responsible for paying base rent plus three categories of property-level operating costs: property taxes, building insurance, and maintenance and repair costs (also called common area maintenance or CAM charges). The landlord receives a "net" rent cheque — free of the operating costs it would otherwise have to absorb — and the tenant absorbs the variable cost exposure of owning the building's operating expenses without owning the building itself. In GTA industrial real estate, the triple net structure is the overwhelming norm. Whether the building is a 20,000 square foot multi-tenant bay in Brampton or a 500,000 square foot purpose-built distribution centre in Milton, the lease will almost always be structured as a net lease with the operating costs passed through to the tenant. This is fundamentally different from the residential rental market or many retail and office leases, where gross rent structures (landlord absorbs operating costs) or modified gross structures (partial pass-through) are more common. **The three nets explained** *Net 1 — Property taxes:* The tenant pays their proportionate share of the municipal property taxes assessed against the building and land. In a single-tenant building, the tenant typically pays 100% of the property tax levy. In a multi-tenant building, each tenant pays a pro-rata share based on their leased square footage as a percentage of the total rentable area. Property taxes in Ontario can represent $2.00 to $4.00 per square foot annually for industrial product, making this a material line item in the tenant's total occupancy cost. *Net 2 — Building insurance:* The tenant pays their proportionate share of the landlord's property insurance premium — the policy that covers the building structure, common areas, and landlord's liability. This is distinct from the tenant's own contents insurance and tenant liability insurance, which the tenant procures separately and which are not part of the NNN pass-through. Building insurance typically contributes $0.20 to $0.50 per square foot annually to the tenant's operating cost exposure in GTA industrial leases. *Net 3 — Maintenance and operating costs (CAM):* This is the broadest and most variable of the three nets. Common area maintenance charges cover the costs of operating, maintaining, and repairing the building and its shared systems — roof maintenance and repair, parking lot maintenance, snow removal, landscaping, exterior lighting, HVAC servicing (for common or rooftop units), property management fees, and building-level utilities for common areas. In GTA industrial leases, CAM charges typically run $1.50 to $3.50 per square foot annually depending on the age and condition of the building, the scope of services included, and whether the landlord charges a management fee on top of direct costs. **How NNN differs from gross and modified gross leases** In a gross lease, the tenant pays a single all-in rent figure and the landlord absorbs all operating costs. The tenant's cost exposure is fixed and predictable; the landlord bears the risk of rising property taxes, insurance premiums, and maintenance costs. Gross leases are rare in GTA industrial real estate outside of very short-term or small-format deals. In a modified gross lease (also called a net lease with a base year or an expense stop), the tenant pays base rent plus only the operating cost increases above a defined threshold — typically the actual operating cost level in the first year of the lease (the "base year"). If operating costs in subsequent years exceed the base year level, the tenant absorbs the excess; if they stay flat or decline, the tenant pays nothing additional. This structure is common in office leasing and occasionally appears in older GTA industrial leases. In a pure triple net lease — the standard GTA industrial structure — there is no base year and no expense stop. The tenant pays their full pro-rata share of all operating costs from day one, with no ceiling and no landlord subsidy. The net rent the landlord receives is truly net of all building-level costs. **Typical NNN lease structure in GTA industrial real estate** In practice, GTA industrial NNN leases work as follows: the landlord estimates the total annual operating costs for the building at the start of each lease year, divides those costs by the total rentable area of the building, and charges each tenant a monthly installment of their pro-rata estimated operating cost alongside base rent. This estimated amount — called the additional rent or operating cost estimate — is paid monthly throughout the year. At the end of each calendar year, the landlord performs a reconciliation: actual operating costs are tallied and compared to the estimated amounts collected. If actual costs exceeded the estimates, the tenant receives a year-end "top-up" invoice for the shortfall. If actual costs were lower than estimated, the tenant receives a credit against future additional rent. Most standard GTA industrial lease forms require the landlord to provide the operating cost reconciliation within 90 to 180 days of year-end and give the tenant audit rights to verify the calculation. **What tenants should watch for when negotiating a NNN lease** The most important negotiating point in any NNN lease is the definition of what is and is not included in the operating cost pool. Tenants should negotiate hard to exclude: capital expenditures (major roof replacement, parking lot repaving, HVAC equipment replacement) from the recurring CAM charges — these should be amortized over the useful life of the improvement rather than expensed 100% in the year incurred; landlord's income taxes and financing costs; leasing commissions and tenant inducements paid to other tenants; depreciation on the building; and costs recovered from insurance proceeds or other third parties. Tenants should also negotiate a cap on the annual increase in controllable operating costs — typically a 3% to 5% per year cap on the CAM component (excluding property taxes and insurance, which are not within the landlord's control). This cap limits exposure to management fee inflation, landscaping contract escalations, and other discretionary operating cost items. Finally, tenants should request audit rights with a defined time window (typically 12 months from receipt of the annual reconciliation statement) and the right to dispute charges. Many landlords resist this; tenants with leverage on deal size or term length should insist on it. Michael Law specializes in industrial tenant representation and lease negotiation across the GTA, including NNN lease structure review, operating cost cap negotiation, and annual reconciliation disputes. Contact Michael at mlaw@lennard.com or (416) 569-6722 to discuss your lease renewal or new space requirements.