Definition
A triple-net lease (NNN) is a commercial lease where the tenant pays base rent plus most or all of the property’s operating expenses—typically: real estate taxes, property insurance, and maintenance (the “three netsâ€). The goal is to shift expense variability from the landlord to the tenant, creating more predictable landlord cash flow.
The “Three Netsâ€
- N = Real estate taxes (property tax bills and related assessments, as allowed)
- N = Property insurance (building insurance and related coverage)
- N = Common area maintenance (CAM) / maintenance (repairs, landscaping, snow removal, utilities for common areas, etc.)
How Rent Is Quoted
In NNN leasing, you’ll often see rent quoted in two layers:
- Base rent: the “rent†portion (often quoted $/SF/year).
- NNN expenses: additional charges (often estimated $/SF/year) that reimburse operating costs.
The tenant’s all-in payment is often described as base rent + NNN. In some markets, brokers may quote an “all-in†number, but it’s critical to verify what’s included.
NNN vs. Other Lease Types
- Gross lease: tenant pays one rent number; landlord covers most expenses.
- Modified gross: landlord and tenant split expenses in negotiated ways.
- Double-net (NN): tenant pays taxes and insurance; landlord typically covers maintenance (varies).
- Triple-net (NNN): tenant pays taxes, insurance, and maintenance/CAM (most common “net†structure).
Why NNN Matters to Investors
- More predictable NOI: fewer variable operating expenses hitting the landlord’s P&L.
- Inflation hedge: expenses that rise with inflation can be reimbursed by the tenant.
- Simplified operations: especially for single-tenant properties with strong tenants.
- Credit focus: value often depends heavily on tenant credit, lease term, and location.
What Risks Still Remain
“NNN†doesn’t mean the landlord has no risk. Key landlord risks include:
- Vacancy / re-leasing risk: if the tenant leaves, the landlord bears downtime and re-tenant costs.
- Capital expenditures: roofs, structure, parking lots, and major systems may remain landlord responsibilities depending on the lease.
- Credit risk: tenant financial health can dominate property performance (especially in single-tenant deals).
- Expense definitions: leases vary—what qualifies as “maintenance†or reimbursable CAM can be disputed.
- Audit/true-up risk: operating expense reconciliations can create friction if estimates are wrong.
Example
A retail tenant leases 5,000 SF under a NNN lease:
- Base rent: $28.00/SF/year
- NNN estimate: $7.50/SF/year
The tenant’s estimated all-in annual payment is:
- All-in = (28.00 + 7.50) × 5,000 = $177,500/year (plus any specified utilities/fees)
If taxes or insurance increase, the NNN portion typically increases (subject to the lease terms and any caps).
Common Pitfalls
- Assuming “absolute NNNâ€: some leases still leave certain repairs or capex with the landlord.
- Ignoring capex: reimbursements cover operating expenses, not always large replacements (roof/structure).
- Misreading CAM definitions: what’s included/excluded can materially change economics.
- Tenant concentration: single-tenant NNN is often a credit play—lease rollover can be binary.
- Not modeling downtime: when a tenant vacates, a “low-management†asset can become capital-intensive fast.