NNN stands for the three categories of operating expense a tenant pays in addition to base rent: property taxes, building insurance, and common area maintenance, which together are shortened to the three N's. A tenant on a true triple net lease covers all three, along with most repair and maintenance obligations for the building itself, leaving the landlord's income close to the base rent figure without the deductions a gross lease would require for taxes and insurance.
That structure is why triple net leases are common in single-tenant retail, industrial, and medical buildings, where one occupant controls the entire property and can reasonably be expected to manage its own operating costs directly.
How NNN Differs From a Gross or Modified Gross Lease
Under a gross lease, the landlord pays taxes, insurance, and maintenance out of the rent collected, and the tenant's monthly payment is a single number that does not change based on those costs. A modified gross lease splits the difference, with some expenses passed to the tenant and others retained by the landlord, and the specific split varies by property and negotiation. A triple net lease pushes essentially all of those costs to the tenant, which is why net lease rent is quoted lower per square foot than gross rent for comparable space; the tenant is paying the operating costs separately, not because the space is cheaper.
Single Net, Double Net, and Triple Net Are Not the Same Thing
A single net lease, sometimes labeled N, has the tenant paying property taxes only, with the landlord still responsible for insurance and maintenance. A double net lease, or NN, adds insurance to the tenant's obligations while the landlord retains structural and roof responsibility. Only a true triple net lease shifts taxes, insurance, and maintenance, including in many cases the roof and structure, to the tenant. Listings sometimes use NNN loosely to describe any lease with tenant expense responsibility, so the specific expense allocation in the lease document, not the label on the offering sheet, determines what a landlord is actually responsible for.
What a Landlord Typically Still Handles
Even under a well-drafted triple net lease, a landlord commonly retains a few obligations depending on how the lease was negotiated: capital replacements to major building systems in some leases, landlord's own insurance on the building structure separate from the tenant's liability coverage, and administrative work like collecting rent statements and enforcing lease terms if a tenant falls behind. Reading the specific lease rather than assuming a triple net label means zero landlord responsibility is a step worth taking before closing on a leased property.
Rent Escalations Inside a Net Lease Term
Most net leases build in scheduled rent increases, either as a fixed percentage every year or every few years, or tied to a published index. A ten percent bump every five years is a common structure in retail net leases, while some industrial and medical net leases use smaller annual increases instead. The escalation schedule affects the property's income growth over the hold period independent of the market, and comparing two properties without lining up their escalation schedules can make a lower-starting-rent property look weaker than it actually performs by year ten.
Common 1031 Exchange Questions
What does NNN stand for in a commercial lease?
NNN refers to the three categories of operating expense the tenant covers: property taxes, building insurance, and common area maintenance, in addition to base rent.
Is a triple net lease better for a landlord than a gross lease?
It depends on the goal. A triple net lease produces more predictable net income since operating costs are passed to the tenant, but the quoted rent is typically lower per square foot than gross rent, since the tenant is separately covering those costs.
Who is responsible for the roof under a triple net lease?
It varies by lease. Many triple net leases assign roof and structural responsibility to the tenant, but some landlords retain that obligation even under an otherwise triple net structure. The specific lease language controls, not the general label.
How often do net leases typically include rent increases?
Common structures include a fixed percentage increase every year or every few years, or an increase tied to a published index. The specific schedule is set in the lease and varies by tenant and property type.
Does the type of net lease affect whether the property qualifies for a 1031 exchange?
No. The lease structure does not determine 1031 eligibility. What matters is that the underlying property interest is real property held for investment or business use, regardless of whether the lease is gross, single net, double net, or triple net.
