A net lease is any commercial lease where the tenant pays some or all of the building's operating costs on top of base rent, rather than those costs being baked into a single gross rent number. The 'net' terminology, single net, double net, triple net, describes how much of that cost burden shifts to the tenant, and getting the distinction right changes how a landlord should underwrite the income.
Single, Double, and Triple: What Each Layer Adds
A single net lease, sometimes called an N lease, has the tenant paying property taxes on top of base rent, with insurance and maintenance staying on the landlord's side. A double net, or NN, lease adds insurance to the tenant's obligations, leaving maintenance and usually structural repairs with the landlord. A triple net, or NNN, lease adds maintenance as well, taxes, insurance, and upkeep all shift to the tenant, though structural and roof responsibility depends on the specific lease language rather than the NNN label alone.
Base Rent Versus What the Tenant Actually Pays
Marketing material for a net lease property usually quotes base rent as the headline number, but the tenant's total occupancy cost includes the pass-through expenses on top of that base. A landlord underwriting the deal cares about base rent, since that's the number that generates net operating income; a tenant negotiating the lease cares about total occupancy cost, since that's what actually leaves their bank account each month. Confusing the two during negotiation is a common source of disputes later.
Rent Escalations and How They're Structured
Most net leases build in scheduled rent increases, either a fixed percentage bump at set intervals, commonly ten to fifteen percent every five years, or an index-based escalation tied to a measure like the Consumer Price Index. Fixed escalations are predictable for underwriting; index-based ones track inflation more closely but introduce uncertainty into a long-term pro forma. A lease with flat rent and no escalation clause for fifteen years is a very different income stream than one that steps up every five, even if the starting rent looks identical.
Common Area Maintenance and Expense Reconciliation
In multi-tenant net lease centers, common area maintenance charges, landscaping, parking lot repairs, shared utilities, get billed to tenants based on their proportionate share of the property's square footage. Landlords typically estimate these charges monthly and reconcile against actual expenses annually, billing the tenant for any shortfall or crediting an overage. A landlord who doesn't reconcile promptly each year can end up absorbing real cost overruns that should have been passed through.
Why the Distinction Matters for a Buyer
A buyer comparing two net lease listings with similar quoted cap rates needs to know which expenses the landlord is actually responsible for before assuming the income numbers are comparable. A double net deal where the landlord still covers roof and structure carries real capital exposure that a true triple net deal does not, and that exposure belongs in the underwriting even though it doesn't show up in the current year's cash flow. This distinction also matters directly for 1031 exchange buyers weighing net lease replacement property against a more management-intensive alternative, since the whole appeal of net lease product for a passive exchange buyer depends on the landlord obligations actually being limited, not just labeled that way.
Common 1031 Exchange Questions
What's the difference between a double net and a triple net lease?
A double net lease has the tenant paying taxes and insurance while the landlord retains maintenance and structural responsibility. A triple net lease adds maintenance to the tenant's obligations, though roof and structural responsibility still depends on the specific lease language rather than the NNN label alone.
Does a triple net lease always mean the landlord has zero expenses?
No. Even a true triple net lease can leave the landlord responsible for structural and roof repairs depending on how the lease is drafted, and vacancy periods still fall entirely on the owner regardless of lease type.
How are rent escalations typically structured in a net lease?
Most commonly as a fixed percentage increase every few years, often ten to fifteen percent every five years, or as an index-based adjustment tied to a measure like the Consumer Price Index. Fixed escalations are easier to underwrite; index-based ones track inflation but add uncertainty.
What is common area maintenance reconciliation?
In multi-tenant net lease properties, landlords estimate shared expenses monthly and bill tenants their proportionate share, then reconcile the estimate against actual costs annually. Any shortfall gets billed to tenants, and any overage typically gets credited.
Why do net lease structures matter for a 1031 exchange buyer specifically?
The appeal of net lease property for an exchange buyer moving out of active management is the limited landlord obligation, so confirming what expenses actually stay with the owner matters more here than in a typical purchase. A deal marketed as triple net but structured with real landlord exposure defeats that purpose.
