An nnn lease gets used loosely in conversation to describe almost any commercial lease where the tenant pays some of the building's costs, but the term technically describes a specific split of who pays what. Getting that split right matters to a buyer, because the label on a listing does not always match the lease actually attached to the property.
The Three Levels of Net
A single net lease has the tenant paying property taxes on top of base rent, with the landlord still covering insurance and maintenance. A double net lease adds insurance to the tenant's responsibility, leaving maintenance with the landlord. A triple net lease, the NNN structure most South Carolina investors are shopping for, shifts all three: taxes, insurance, and maintenance become the tenant's expense, and the landlord collects rent that is close to pure income.
Where Roof and Structure Responsibility Actually Sits
Even inside a true triple net lease, roof and structural repairs are frequently carved out and left with the landlord, especially in leases written by national retail and restaurant tenants. A lease can be marketed as NNN and still leave the owner exposed to a six-figure roof replacement if the language wasn't read closely. Reviewing the specific maintenance clause, not just the NNN label, is the difference between an accurate underwriting and an expensive surprise.
Gross Leases Sit on the Other End
A full-service gross lease is the opposite structure: the landlord pays taxes, insurance, and maintenance out of the rent collected, and the tenant writes one check that covers everything. Office buildings and some multi-tenant retail centers in South Carolina still lease this way, particularly where a landlord wants control over building appearance and systems rather than leaving upkeep to individual tenants. A modified gross lease splits the difference, with the tenant covering some operating costs and the landlord covering others by specific negotiation.
Why the Structure Changes What a Property Is Worth
A net lease shifts operating risk to the tenant, which is exactly why net-leased buildings trade at lower cap rates, and therefore higher prices relative to rent, than comparable gross-leased buildings with the same rent roll. A buyer evaluating two properties with identical rent needs to look past the top-line number and understand what expenses the landlord is still on the hook for, because a gross lease's rent has to cover real operating costs the NNN rent does not.
South Carolina retail and industrial product built in the last two decades trades almost exclusively on net lease terms, following the national pattern, while older office stock in markets like Columbia and Greenville still carries more gross and modified gross leases from an earlier era of construction.
Net Lease Property as 1031 Replacement
The lease structure a replacement property carries doesn't change 1031 eligibility on its own; what matters is that the property is held for investment or business use. Where lease structure matters is in the exchange's day-to-day economics after closing: a South Carolina investor exchanging out of a self-managed rental into a triple net property is trading active landlord duties for a rent check, while an exchange into a gross-leased building keeps more of that management responsibility in place.
Reading the actual lease document rather than relying on a broker's summary of the lease type matters more here than in most other real estate decisions, since the label attached to a listing is only a starting point. A lease abstract, a short summary pulling every operating clause, expense responsibility, renewal option, and assignment right, out of the full lease document, is worth commissioning before closing on any net-leased property, whether the purchase is funded with exchange proceeds or not.
Frequently Asked Questions
What is the difference between a single net and triple net lease?
A single net lease has the tenant paying only property taxes on top of rent, while a triple net lease has the tenant paying taxes, insurance, and maintenance, leaving the landlord with close to pure rental income.
Does a NNN lease always cover roof and structure?
Not always; roof and structural repairs are commonly carved out and left as a landlord responsibility even in leases marketed as triple net, so the actual lease language should be checked.
What is a gross lease?
A gross lease has the landlord paying property taxes, insurance, and maintenance out of the rent collected, so the tenant writes a single payment that covers occupancy.
Why do net-leased properties trade at lower cap rates?
Net leases shift operating cost risk to the tenant, which reduces the landlord's exposure and typically results in the market pricing the property at a lower cap rate, or higher price relative to rent.
Can any lease structure qualify as 1031 replacement property?
Yes, 1031 eligibility depends on the property being held for investment or business use, not on whether the lease is net or gross.