What Is Triple Net Lease? A CRE Professional’s Guide

A triple net lease (NNN) is a lease structure in which the tenant, not the landlord, pays real estate taxes, property insurance, and common area maintenance on top of base rent. It’s the most landlord-favorable of the standard lease types, and it’s the default structure across most single-tenant industrial and net-lease retail deals in the U.S. today.

What Is a Triple Net Lease, Exactly?

A triple net lease requires the tenant to pay base rent plus a pro-rata share of the property’s three core operating costs: taxes, insurance, and maintenance. The landlord’s income is effectively insulated from expense inflation, since the tenant absorbs increases in tax assessments, premium hikes, and repair costs directly.

This differs from the two other structures every practitioner should be able to name on sight. In a gross lease, the tenant pays one number and the landlord covers operating expenses out of that rent. In a modified gross lease, expenses are split by negotiated agreement, often with a base year that shifts increases above that year onto the tenant. The triple net lease sits at the far end of the spectrum: base rent is quoted lower than a gross-equivalent rent because the tenant is underwriting expense risk the landlord would otherwise carry.

Appraisers and underwriters care about this distinction because it changes what “rent” actually measures. A $12.00/SF NNN quote and a $18.00/SF gross quote might represent nearly identical total occupancy cost once expenses are added back. Comparing quoted rents across lease types without normalizing for structure is one of the more common underwriting errors in a comp set.

Key Takeaway: A triple net lease shifts property taxes, insurance, and common area maintenance to the tenant as additional rent on top of a lower base rent. Always convert to a fully loaded occupancy cost before comparing an NNN lease against gross or modified gross comps.

How Does a Triple Net Lease Differ From Double Net and Absolute Net?

A double net (NN) lease has the tenant paying taxes and insurance while the landlord retains responsibility for maintenance and structural repairs. A triple net lease adds maintenance to the tenant’s obligations, and an absolute net (or “bondable”) lease goes further, making the tenant responsible for structural and capital repairs the landlord would normally retain even under NNN terms.

The progression matters for risk allocation, not just terminology:

• Single net (N): Tenant pays property taxes only.
• Double net (NN): Tenant pays taxes and insurance; landlord handles structure and common areas.
• Triple net (NNN): Tenant pays taxes, insurance, and maintenance.
• Absolute net: Tenant additionally assumes roof, structure, and capital repair obligations, common in sale-leaseback and build-to-suit deals for credit tenants.

Lenders underwriting a net-lease asset need to know exactly where that line falls. A property marketed as “NNN” with a landlord-responsibility carve-out for roof and structure is a materially different credit risk than an absolute net deal where the tenant is bondable for the full term.

Why Do Landlords and Investors Prefer Triple Net Leases?

Landlords prefer triple net leases because they convert a variable-expense asset into something closer to a fixed-income instrument. Net operating income stays largely insulated from tax reassessments and insurance market cycles, and maintenance cost inflation gets absorbed by the tenant too. That’s precisely why single-tenant net-lease assets trade on cap rate compression tied to tenant credit rather than local expense trends.

That structure explains why triple net leases dominate single-tenant industrial and net-lease retail. A national or regional credit tenant signs a long-term lease, the landlord underwrites the deal almost entirely on the tenant’s balance sheet, and the asset behaves like a bond wrapped around real estate. Institutional buyers of single-tenant assets, including many net-lease REITs, price these deals on WALT and tenant credit quality more than on local market rent growth.

In industrial real estate specifically, single-tenant net lease (STNL) structures, which are almost always written on triple net terms, carry a measurable rent premium over non-STNL space in multi-tenant buildings. Per CompStak’s 2026 Biannual Industrial Market Overview — Part Three, STNL starting rents held a premium above 5% over non-STNL rents for four consecutive quarters, reaching 5.6% in Q1 2026 ($11.46/SF versus $10.85/SF). Since Q1 2019, STNL rents have grown 93.3%, compared with 76.1% for non-STNL space. That spread reflects the certainty landlords price into a triple-net structure: fewer rollover events and a single credit relationship, with expense pass-throughs protecting the net rent stream.

Source: CompStak’s 2026 Biannual Industrial Market Overview — Part Three. Data as of Q1 2026.

What Are the Risks of a Triple Net Lease?

The primary risk in a triple net lease sits with the tenant, who absorbs expense volatility the landlord would otherwise bear, but landlords carry a different risk: concentration. A single-tenant NNN asset generates no income diversification. If the tenant vacates or defaults, the landlord holds a building with one lease and, potentially, one buyer pool until it’s re-tenanted.

Lenders underwriting net-lease collateral focus on tenant credit rating and remaining lease term, plus the rent-to-market spread at maturity. A triple net lease with 15 years remaining to an investment-grade tenant underwrites very differently than the same structure with three years left to a private operator carrying no credit rating. WALT carries as much weight in net-lease underwriting as tenant credit does.

Escalations also deserve scrutiny. Many triple net leases use fixed annual bumps (commonly 1.5% to 3%), while others tie increases to the Consumer Price Index. CRE professionals modeling long-dated NNN cash flows should reference actual CPI data from the Bureau of Labor Statistics rather than assuming a flat historical average, since CPI-linked escalations can lag or outpace fixed structures depending on the inflation environment at signing.

How Should CRE Professionals Analyze Triple Net Lease Comps?

Analyzing triple net lease comps starts with normalizing rent to a common basis, since a NNN quote isn’t directly comparable to a gross or modified gross quote without adding back expense reimbursements. From there, the relevant underwriting inputs are largely the same as any lease comp: starting rent, escalations, term length, and landlord concessions.

CompStak’s lease comp data captures lease structure alongside starting rent and in-place rent, along with Work Value, CompStak’s field name for tenant improvement allowance. The data spans office, industrial, and retail markets. Because triple net deals typically carry minimal landlord-funded improvements compared with gross leases in the same market, comparing Work Value figures across structures is often a faster way to sanity-check whether a deal is truly NNN than relying on the lease abstract’s boilerplate language alone.

Every comp on CompStak Exchange goes through a multi-step verification process, including machine learning anomaly detection and review by CompStak’s CRE data analysts, before it’s usable for underwriting. For net-lease assets in particular, where a mislabeled expense structure can distort a cap rate calculation, that verification step matters more than it does in a market with dozens of comparable multi-tenant leases to average against.

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FAQ: Triple Net Lease