Key Takeaways
- Gross leases include all expenses in rent; NNN leases pass taxes, insurance, and maintenance to tenants.
- Modified gross leases with expense stops are common in office, sharing cost increases above a base year.
- NNN lease investors focus on tenant credit quality because income reliability depends entirely on the tenant.
- Always normalize lease types to an equivalent basis when comparing properties with different structures.
Lease structure determines who pays operating expenses — and therefore how much risk the landlord retains versus transfers to tenants. Understanding the full spectrum of CRE lease types is essential for accurate NOI calculation, property comparison, and investment analysis.
Gross and Modified Gross Leases
In a gross lease (also called a full-service lease), the tenant pays a single all-inclusive rent, and the landlord pays all operating expenses — taxes, insurance, utilities, janitorial services, and maintenance. Gross leases are most common in multi-tenant office buildings where individual tenant utility metering is impractical. The landlord bears operating expense risk, meaning that if expenses rise faster than rental escalations, the landlord's NOI declines.
Modified gross leases split operating expenses between landlord and tenant in a negotiated arrangement. Common structures include the tenant paying utilities and janitorial while the landlord covers taxes, insurance, and structural maintenance. Modified gross leases often include an expense stop — a base year expense level above which the tenant pays their proportional share of any increase. For example, if base year expenses are $8.00 per square foot and expenses rise to $9.50, the tenant pays the $1.50 increase proportionally.
Net, NN, and NNN Leases
Net lease structures progressively shift operating expenses from landlord to tenant. A single-net (N) lease requires tenants to pay property taxes in addition to base rent. A double-net (NN) lease adds insurance. A triple-net (NNN) lease passes all three major expense categories — taxes, insurance, and maintenance — to the tenant. In a true NNN lease, the landlord receives rent with virtually no operating expense obligations.
NNN leases are most common in single-tenant retail properties (pharmacies, dollar stores, fast food restaurants) and industrial buildings. They offer the most predictable income stream for landlords but typically at lower base rent rates compared to gross leases. NNN lease investors focus heavily on tenant credit quality because the lease obligation is only as reliable as the tenant's ability to pay. Investment-grade tenants (rated BBB- or better by S&P) command the lowest cap rates (5.0-6.5%) while non-investment-grade tenants price at higher cap rates (7.0-9.0%).
Comparing Lease Types and Their Investment Implications
Choosing between lease types involves a trade-off between income predictability and return potential. Gross leases offer higher headline rents but expose landlords to expense increases. NNN leases provide stable, predictable NOI but typically at lower base rents. Modified gross leases offer a middle ground with negotiated expense sharing.
When comparing properties with different lease structures, investors must normalize to the same basis. A property advertised at $20 per square foot on a NNN basis versus $32 per square foot on a gross basis may have identical effective rent if operating expenses are $12 per square foot. Failing to normalize lease types leads to incorrect property comparisons and flawed investment decisions.
| Lease Type | Tenant Pays | Landlord Risk | Common Property Types |
|---|---|---|---|
| Gross (Full-Service) | Base rent only | All operating expenses | Multi-tenant office |
| Modified Gross | Rent + some expenses | Shared (varies by negotiation) | Office, some retail |
| Single Net (N) | Rent + taxes | Insurance + maintenance | Rare, some older retail |
| Double Net (NN) | Rent + taxes + insurance | Maintenance only | Some industrial, retail |
| Triple Net (NNN) | Rent + all expenses | Structural/roof only (varies) | Single-tenant retail, industrial |
CRE lease type comparison and typical property applications
Case Study: Normalizing Lease Types for Property Comparison
You are comparing two 10,000 SF retail properties. Property A is listed at $25/SF NNN. Property B is listed at $35/SF gross. Operating expenses in the market average $10/SF.
- 1Calculate Property A effective gross rent: $25 NNN + $10 expenses = $35/SF effective gross.
- 2Property B is listed at $35/SF gross — this is already the effective gross rent.
- 3Both properties have the same effective gross rent at $35/SF.
- 4Calculate NOI for each: Property A NOI = $25/SF x 10,000 = $250,000 (expenses are tenant responsibility). Property B NOI = ($35 - $10) x 10,000 = $250,000.
- 5The key difference: Property A's NOI is insulated from expense increases; Property B's is not.
- 6If expenses rise to $12/SF, Property A NOI stays at $250,000 while Property B NOI drops to $230,000.
You can now make an apples-to-apples comparison and understand that Property A (NNN) offers greater income stability despite identical current NOI.
Key Takeaways
- ✓Gross leases include all expenses in rent; NNN leases pass taxes, insurance, and maintenance to tenants.
- ✓Modified gross leases with expense stops are common in office, sharing cost increases above a base year.
- ✓NNN lease investors focus on tenant credit quality because income reliability depends entirely on the tenant.
- ✓Always normalize lease types to an equivalent basis when comparing properties with different structures.
Sources
- CBRE Net Lease Market Report(2025-01-15)
- JLL U.S. Office Lease Terms Analysis(2025-01-15)
Common Mistakes to Avoid
Comparing NNN lease rents directly to gross lease rents without normalization.
Consequence: A property at $20/SF NNN may appear cheaper than $32/SF gross, but with $12/SF in operating expenses, they are effectively identical. Failure to normalize leads to incorrect investment comparisons.
Correction: Always convert all lease types to the same basis (either effective gross or net) before comparing properties. Add estimated expenses to NNN rents or subtract expenses from gross rents to reach the equivalent figure.
Overlooking expense stop provisions when evaluating modified gross leases.
Consequence: If expenses rise significantly above the base year stop, the tenant's total cost increases substantially, potentially causing tenant complaints, non-renewals, or rent renegotiations that reduce effective income.
Correction: Model expense growth scenarios over the lease term to understand how expense stops affect both tenant costs and landlord income as expenses escalate.
Test Your Knowledge
1.In a modified gross lease with a $8/SF expense stop and current expenses of $10/SF, what is the tenant's additional per-SF payment?
2.Which lease type provides the most predictable income stream for the landlord?
3.Investment-grade NNN tenants (BBB- or better) typically command cap rates in what range?