What Is a Triple Net Lease?

The Plain-English Definition

A triple net lease — written NNN — is a commercial lease where the tenant pays base rent plus three categories of operating expenses, the "nets":

• Property taxes — the real estate taxes on the building, or the tenant's proportional share in a multi-tenant property.
• Insurance — premiums for the landlord's building insurance (the tenant still carries their own liability and contents coverage).
• Maintenance / CAM — upkeep of the property and common areas: landscaping, parking lots, shared lighting, snow removal, property management fees. In multi-tenant buildings these are billed as common area maintenance (CAM) charges.

The trade: base rent in an NNN lease is typically lower than an equivalent gross lease, because the tenant is absorbing costs the landlord would otherwise bake into the rent. Major structural items — roof, foundation, exterior walls — usually remain the landlord's responsibility unless the lease says otherwise.

The Lease Spectrum: Gross to Absolute Net

Triple net is one point on a spectrum. At one end the landlord pays everything out of a single rent figure; at the other, virtually every cost belongs to the tenant.

These labels aren't standardized — the actual lease language controls what each party pays. This guide is general information, not legal advice.

Why Commercial Landlords Like NNN

• Predictable net income — when taxes, insurance, and maintenance pass through to the tenant, a spike in any of them doesn't eat the landlord's margin. Base rent arrives close to net.
• Cost pass-through — rising operating expenses are the tenant's problem by contract, which is why NNN properties with long leases and creditworthy tenants are popular with passive investors.
• Less day-to-day management — in single-tenant NNN deals the tenant often handles maintenance directly, so the landlord's operational involvement is minimal.

What Tenants Should Watch For

The lower base rent is real, but so is the open-ended exposure. Experienced commercial tenants negotiate for:

• Audit rights on CAM charges — the right to review the landlord's books and challenge reconciliations. CAM line items are where disputes concentrate.
• Caps on escalations — a ceiling on how much controllable operating expenses can rise year over year.
• Capital expense exclusions — clear language keeping roof replacements, structural repairs, and other capital items out of the tenant's maintenance obligation.
• A clear pro-rata formula — in multi-tenant buildings, exactly how the tenant's share of shared costs is calculated.

Where Triple Net Leases Show Up

NNN is the default structure in much of commercial real estate: retail (strip centers, standalone pharmacies, fast food, banks), single-tenant commercial buildings leased to one company for a long term, and industrial properties like warehouses and distribution centers.

Residential is the exception. Apartment and house leases are almost always gross leases: the tenant pays one rent number, and the landlord covers property taxes, building insurance, and maintenance out of it. If you're a residential landlord, you won't write NNN leases — but the underlying discipline still applies to you: knowing exactly what taxes, insurance, and maintenance cost per property is what tells you whether your rent actually covers them. Tools like Kelpic®'s property management accounting exist to give landlords that per-property expense visibility.

Frequently Asked Questions