Real Estate

Triple Net (NNN) Lease Calculator

Break down the full cost of a triple net lease by calculating base rent plus property taxes, insurance, and CAM charges separately.

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What Is a Triple Net (NNN) Lease?

A triple net lease (NNN) is a commercial lease structure where the tenant pays base rent plus the three "nets": property taxes, building insurance, and common area maintenance (CAM). This shifts virtually all operating expenses from the landlord to the tenant, making the landlord's base rent nearly pure income. NNN leases are the dominant structure in retail (standalone buildings, strip centers), industrial, and single-tenant commercial properties. The critical implication for tenants is that the quoted NNN base rent significantly understates total occupancy cost. A lease advertised at $18/sq ft NNN might have $9/sq ft in additional NNN charges, making the effective rate $27/sq ft. Tenants must always ask for the estimated NNN charges and compare the total effective rate against gross lease alternatives. A gross lease at $28/sq ft may be cheaper than a NNN at $18/sq ft + $12/sq ft in charges. For landlords and investors, NNN leases are highly desirable because they create predictable income with minimal management responsibility. The tenant maintains the property, pays the taxes, and covers insurance. This passive income structure is why single-tenant NNN properties (think Walgreens, Dollar General, Starbucks) trade at premium cap rates and are a cornerstone of retirement and 1031 exchange portfolios.

How to Use This Calculator

1

Enter the Base Rent

This is the quoted per-square-foot annual rate for the lease, excluding NNN charges. NNN base rents are typically 30-50% lower than comparable gross lease rates because they exclude operating expenses. Confirm with the landlord that the quoted rate is truly "NNN" and not "modified gross" or "net of some expenses."

2

Input Each NNN Component

Property tax: request the actual tax bill and divide by total building square footage. Insurance: request the policy premium and divide by square footage. CAM: request the actual operating budget or historical CAM reconciliation. These numbers change annually; ask for 3 years of history to understand trends.

3

Enter Your Leasable Square Footage

For single-tenant buildings, this is the entire building. For multi-tenant buildings, NNN charges are allocated pro-rata by your percentage of total leasable square footage. Verify whether your share is calculated on a leasable or usable square foot basis.

4

Review the Effective Rate

The effective rate (base rent + NNN per square foot) is the only meaningful comparison number across lease types. Use this to compare against gross lease proposals, other NNN opportunities, and your budget. The NNN percentage shows how much of your total rent goes to operating expenses versus the landlord's income.

Key Concepts

The Three Nets

Property taxes (Net 1), building insurance (Net 2), and common area maintenance (Net 3). In a true NNN lease, the tenant pays all three. In a "NN" or "double net" lease, the tenant pays two (typically taxes and insurance). In a "single net" lease, the tenant pays one (usually property taxes).

CAM Reconciliation

The annual process where the landlord compares estimated CAM charges (collected monthly) against actual expenses. Tenants receive a bill (or credit) for the difference. Reconciliation statements should be auditable; negotiate the right to review the landlord's books within 90 days of receiving the reconciliation.

Absolute Net (Bondable) Lease

The most extreme form of NNN: the tenant is responsible for everything, including structural repairs, roof replacement, and rebuilding after casualty. The landlord has zero responsibility. Common for single-tenant credit-rated properties (national retailers, pharmacies). Investment-grade absolute net leases are the closest thing to a bond in real estate.

Base Year Stop

A lease provision where the landlord pays NNN charges up to the "base year" amount, and the tenant pays only increases above that amount. Common in modified gross leases. This protects the tenant from paying the full NNN in year one while exposing them to increases in subsequent years.

Expert Insights

NNN Charges Can Increase Faster Than Base Rent: While base rent typically escalates 2-3% annually, NNN charges are pass-throughs of actual costs. Property taxes can spike 10-20% after a reassessment. Insurance premiums have increased 15-30% annually in coastal and disaster-prone areas since 2020. CAM can jump unpredictably with major repairs. Without caps, NNN charges can grow far faster than your base rent escalation. Always negotiate a CAM cap.

Audit Rights Are Essential: CAM reconciliations are notoriously inaccurate. Studies by lease audit firms consistently find overcharges in 60-80% of NNN reconciliations, averaging 5-10% of annual CAM. Common errors: including capital improvements in CAM, double-counting expenses, allocating management fees above market rates, and charging for vacant space improvements. Negotiate audit rights and exercise them.

NNN as an Investment Strategy: Single-tenant NNN properties leased to creditworthy tenants (Walgreens, Dollar General, FedEx) with 10-20 year terms are the most passive form of real estate investment. Cap rates for investment-grade NNN range from 5-7%. The trade-off: no management headaches but limited upside since rent increases are fixed at lease signing. These are ideal for 1031 exchanges and retirement portfolios.

Frequently Asked Questions

NNN charges typically add $6-$15/sq ft annually, depending on property type and location. Breakdown: property taxes $3-$8/sq ft, insurance $0.75-$3/sq ft, CAM $2-$8/sq ft. In high-tax states (New Jersey, Connecticut, Illinois), property taxes alone can exceed $10/sq ft. Always request actual NNN charges, not estimates.
In a gross lease, the landlord pays all operating expenses from the single quoted rent. In NNN, the tenant pays base rent plus taxes, insurance, and maintenance separately. The total cost is often similar, but NNN gives the tenant more transparency into expenses and passes annual cost increases directly. Gross leases may have "expense stops" or "base year" provisions that function similarly to NNN above certain thresholds.
Yes, but rarely. Property taxes can decrease if you win a tax appeal or property values decline. Insurance may decrease after a claims-free period or when switching carriers. CAM decreases are unusual because maintenance costs tend to rise. In practice, tenants should budget for NNN increases of 3-5% annually.
The charges themselves are pass-throughs of actual costs, so they are not directly negotiable. However, you can negotiate: a CAM cap (limits annual increases), exclusions (removing capital expenditures or management fees above a percentage from CAM), an audit right, and a "gross-up" provision (if the building is not fully occupied, expenses are calculated as if it were, preventing remaining tenants from subsidizing vacancy).

Results are estimates for educational purposes only. Actual amounts may vary based on your specific financial situation, market conditions, and other factors. This calculator does not constitute financial advice.

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