NNN gets used loosely in commercial real estate marketing, applied to almost any lease where the tenant pays some operating costs. The strict definition is narrower: in a true triple net lease, the tenant pays property taxes, building insurance, and common area or building maintenance, in addition to base rent, leaving the landlord with a close to passive income stream. Knowing where a specific lease falls on that spectrum matters more than the label on the listing sheet.
The Three Nets, One at a Time
Each "net" in triple net refers to a specific expense category shifting from landlord to tenant. The first net is real estate taxes, the second is building insurance, and the third is maintenance and common area costs. A single net lease shifts only taxes, a double net lease shifts taxes and insurance, and a triple net lease shifts all three, plus in many cases structural and roof responsibility as well, depending on how the specific lease defines maintenance.
How NNN Differs From Gross and Modified Gross Leases
A gross lease is the opposite structure: the tenant pays one flat rent number and the landlord covers taxes, insurance, and maintenance out of that rent, which is the more common structure in office and multi-tenant retail space. A modified gross lease sits in between, with the tenant paying a base rent plus some but not all operating expenses, often negotiated on a line-by-line basis. Triple net shifts the most risk and the most predictability to the landlord's side of the ledger, since expense increases pass through to the tenant instead of eroding the owner's net income.
Why Landlords Prefer the Structure and What It Costs Them
A triple net lease insulates the owner from rising property taxes, insurance premiums, and repair costs, which is exactly why it's the preferred structure for owners who want a low-management income stream rather than an active operating business. The tradeoff is pricing: because the income is more predictable and the landlord's obligations are minimal, NNN properties generally trade at lower cap rates than comparable multi-tenant retail or office assets, meaning the buyer pays more per dollar of income for that predictability.
Where the Fine Print Still Matters
Even inside a lease labeled triple net, the specific allocation of roof and structural responsibility varies, and that clause is worth reading before assuming a landlord has zero ongoing obligation. Some leases define maintenance to exclude the roof and structural elements, which stay with the landlord regardless of the NNN label, and a buyer who assumes otherwise can be surprised by a six-figure roof replacement bill years into ownership. Reviewing the actual lease document rather than relying on a broker's summary is the only way to know which version of NNN a specific property carries. It's also why triple net buildings and DST portfolios holding several of them show up so often as 1031 replacement property - the leases are already written to minimize the owner's active involvement, which suits an exchanger who wants income without a second job managing it.
Common 1031 Exchange Questions
Does every NNN lease put the roof on the tenant?
Not always. Some triple net leases exclude roof and structure from the tenant's maintenance obligation, leaving that responsibility with the landlord regardless of the NNN label. The specific lease language, not the general term, determines who pays.
What's the difference between double net and triple net?
A double net lease shifts property taxes and insurance to the tenant but leaves maintenance with the landlord, while a triple net lease shifts taxes, insurance, and maintenance. The extra category is the meaningful difference between the two structures.
Do triple net leases typically have rent escalations?
Most do, either fixed annual or periodic increases, or increases tied to the Consumer Price Index, though some long-term leases with strong national tenants are negotiated flat for extended periods. The escalation structure should be checked against the specific lease rather than assumed.
Are NNN leases only used for single-tenant retail buildings?
No. While drugstores and quick-service restaurants are the most visible examples, triple net structures are also common in industrial, office, and medical buildings, particularly where a single tenant occupies the entire building.
Can a tenant negotiate out of triple net obligations?
In some markets and asset classes tenants negotiate caps on annual expense increases or exclusions for capital repairs, so the presence of a NNN label doesn't mean every cost automatically passes through without limit. Lease negotiation history varies by tenant size and leverage.
