What is a NNN Lease (Triple Net)?
The lease structure where tenants pay base rent plus all operating expenses — and where the tenant credit and lease terms often matter more than the real estate itself.
Key takeaways
- In a NNN (triple net) lease, the tenant pays base rent plus property taxes, insurance, and maintenance — effectively all operating expenses
- NNN leases are the dominant structure in single-tenant retail and industrial CRE, and lease terms (length, escalations, tenant credit) often drive more value than the property's physical attributes
- Tenant credit quality is the primary risk factor in NNN assets — the lease is only as good as the tenant behind it
- NNN does not mean passive or management-free — landlords still carry vacancy risk at lease expiration, and tenant obligation oversight requires attention
The plain-English definition
A triple net lease — universally abbreviated NNN — is a lease structure in which the tenant pays base rent plus three additional categories of operating expenses: property taxes, property insurance, and maintenance (including CAM, or common area maintenance). In a true NNN lease, the tenant's rent payment covers essentially all costs associated with owning the property, leaving the landlord with a relatively predictable, low-management income stream.
The "three nets" in NNN refer to these three expense categories. In practice, NNN leases across different asset classes and tenants vary in exactly how expenses are allocated. Some NNN leases are "absolute NNN," where the tenant is responsible for everything including structural repairs. Others are "bond-net" leases, which are even more landlord-favorable. Modified gross and NNN+ leases fall somewhere in between. Understanding what "NNN" actually means in a specific lease requires reading the document, not just the label.
NNN leases are the dominant structure in single-tenant retail (think fast food, pharmacy chains, dollar stores, auto parts retailers), and are also common in industrial, build-to-suit, and net-leased office properties. The asset class is sometimes referred to simply as "net lease" real estate, and it trades at some of the lowest cap rates in CRE because of the perceived stability of the income stream.
How brokers use it in practice
For brokers marketing NNN assets, the lease is the product as much as the real estate. Buyers of NNN properties are primarily buying a cash flow stream — one that is contractually defined, backed by a specific tenant's credit, and predictable over the remaining lease term. The physical asset matters less than it does in other CRE categories; what drives value is the combination of remaining lease term, scheduled rent escalations, and the creditworthiness of the tenant.
In an OM for a NNN asset, three elements dominate the financial narrative: lease term (how many years remain, and whether there are renewal options), escalations (fixed percentage increases, typically 5–10% every 5 years, or CPI-linked), and tenant credit (is the tenant investment-grade, franchisee-backed, or private? How many locations do they operate? What is their revenue and operating history?). For national credit tenants — investment-grade corporations like McDonald's, CVS, or Dollar General — the credit story is straightforward and broadly understood. For franchisee-backed or private tenants, the broker's job is to present the credit story affirmatively and proactively, because buyers will ask.
Cap rate compression in NNN assets is directly tied to these three factors. A 15-year lease with 10% escalations every 5 years, backed by an investment-grade tenant, will trade at a lower cap rate (higher price per dollar of NOI) than a 5-year lease with flat rent backed by a private operator. For how to present NNN income in a compelling offering memorandum, see the OM glossary entry. Brokers who understand and can explain these dynamics can defend pricing, manage buyer expectations, and attract the right capital — institutional buyers, 1031 exchange buyers, and private wealth investors who prioritize income stability. For how to reach and nurture that investor base, see the Investor Nurturing Guide.
Common misconceptions
The most widespread misconception about NNN leases is that they represent a passive, management-free investment. They don't — not entirely. While NNN leases transfer most day-to-day property management responsibilities to the tenant, landlords still carry meaningful obligations and risks. First, landlords must monitor tenant compliance with their lease obligations: are they actually maintaining the property, paying taxes on time, and carrying required insurance? Deferred maintenance by a tenant can result in expensive remediation at lease expiration. Second, and more significantly, lease expiration risk is substantial. When a long-term NNN lease ends, the property either needs to be re-leased or sold — and a vacant NNN building in a tertiary market can be very difficult to release or sell at a favorable price.
A second misconception: that all NNN leases are equivalent. They aren't. "NNN" on a marketing flyer tells you the lease type but nothing about the specific allocation of expenses. A buyer who assumes a NNN lease means absolute net — and later discovers the landlord is responsible for roof and structure — has materially mispriced their acquisition. Reading the actual lease is not optional.
Finally, some buyers conflate low cap rate with low risk. NNN properties with investment-grade tenants do trade at cap rates of 4–6% in many markets, reflecting the market's perception of low risk. But the single-tenant concentration risk is real — one tenant, one lease, one expiration date. Diversified portfolios of NNN assets mitigate this; single-asset NNN buyers should price in the binary risk of vacancy.
Frequently asked questions
What's the difference between NNN, NN, and gross leases?
In a gross lease, the landlord pays all operating expenses and the tenant pays only base rent. A NN (double net) lease requires the tenant to pay base rent plus property taxes and insurance but not maintenance. A NNN lease adds maintenance to the tenant's obligations. Absolute NNN adds structural repairs. The more expenses the tenant carries, the more landlord-favorable the structure — and generally, the more valuable the lease.
Why do NNN properties trade at lower cap rates than other asset types?
Low cap rates reflect lower perceived risk. NNN leases with long terms and creditworthy tenants offer predictable, contractually guaranteed income streams with minimal management burden. The market prices that certainty at a premium — meaning lower cap rates and higher prices relative to NOI. Risk premiums rise for shorter leases, weaker tenant credit, or secondary/tertiary locations.
What happens to a NNN property at lease expiration?
At lease expiration, the landlord either negotiates a renewal with the existing tenant, finds a new tenant, or sells the property — ideally before expiration when lease term value still supports the price. Properties with leases expiring within 2–3 years typically face cap rate expansion (lower prices) as buyers price in the re-leasing risk. This is why lease term is one of the most important value drivers for NNN assets.
How do 1031 exchange buyers approach NNN properties?
NNN properties are among the most popular 1031 exchange targets because the passive income structure and long lease terms allow exchanging investors to reinvest sale proceeds without taking on active management responsibilities. The compressed timelines of 1031 exchanges (45-day identification, 180-day close) also favor NNN assets, which are simpler to underwrite quickly than value-add or development deals.