Triple Net (NNN) vs Modified Gross: Commercial Lease Cost Allocation & Landlord Risk
Pass-through taxes, insurance, and CAM expenses versus shared operational cost splits
In a Triple Net (NNN) commercial lease, the tenant pays base rent plus 100% of property taxes, building insurance, and common area maintenance (CAM). In a Modified Gross (MG) lease, the landlord pays standard base operating expenses out of a higher initial rent, passing through only annual operating cost increases above the base year.
Technical Tradeoff & Benchmark Matrix
| Commercial Lease Dimension | Triple Net (NNN) | Modified Gross (MG) |
|---|---|---|
| Base Rental Rate | Significantly lower quoted square-foot rate | Higher quoted rate encompassing base operational costs |
| Property Tax Exposure | Tenant pays 100% of property tax assessments | Landlord pays baseline; tenant pays increases over base year |
| Property Insurance | Tenant pays property casualty/liability insurance | Landlord pays baseline building insurance policy |
| Common Area Maintenance (CAM) | Tenant pays all repairs, landscaping, snow removal, parking | Landlord manages CAM; tenant pays pro-rata escalations |
| Inflation & Expense Risk | 100% shifted from landlord to tenant | Shared between landlord and tenant |
| Prevalent Asset Classes | Single-tenant retail, quick-service restaurants, industrial warehouses | Multi-tenant office buildings, medical centers, executive suites |
Frequently Asked Questions & Technical Analysis
Q: Why do institutional commercial real estate investors prefer NNN properties?
NNN leases deliver highly predictable, passive cash flow free from unexpected operational cost spikes. Rising municipal property taxes or roof repairs pass directly to credit tenants.
Q: What is a 'Base Year' in a Modified Gross commercial lease?
The Base Year establishes the benchmark operating expenses (usually the first calendar year of occupancy). In subsequent years, the landlord bills the tenant only for their fractional share of expense increases above that base.