NNN vs Gross vs Modified Gross Leases: Beginner CRE Guide
Learn the difference between NNN, gross, and modified gross leases, how reimbursements work, and how lease structure impacts NOI and risk.
Why Lease Type Matters More Than Beginners Think
In commercial real estate, the lease isn’t just paperwork—it’s the income engine.
Lease structure determines:
who pays what
how predictable your NOI is
how exposed you are to rising expenses (taxes/insurance/utilities)
what happens when costs spike
The 3 Main Lease Types (Plain English)
1) Gross Lease
Tenant pays a single rent amount. Landlord pays most operating expenses.
Common in: some office, some mixed-use retail components
Pros for beginners: simple to understand
Cons: landlord bears expense inflation risk
2) Modified Gross Lease
Tenant pays base rent + some expenses (structure varies).
Examples:
tenant pays utilities
landlord pays taxes/insurance, tenant pays CAM
“base year” stop: tenant pays increases over a base year expense level
Common in: office, some retail, mixed-use
Pros: risk sharing
Cons: complexity—read the lease carefully
3) NNN (Triple Net) Lease
Tenant pays base rent plus reimbursements for:
N: property taxes
N: insurance
N: common area maintenance (CAM)
(Exact responsibilities are defined by the lease.)
Common in: retail, industrial, some single-tenant deals
Pros: predictable NOI, inflation pass-through (if structured well)
Cons: reimbursement shortfalls and lease language traps can surprise you
What Is CAM (Common Area Maintenance)?
CAM typically covers shared area expenses like:
snow removal
landscaping
parking lot maintenance
exterior lighting
common area cleaning
Important: CAM can be capped, excluded, or defined differently per lease.
Beginner Example: Why Lease Type Changes “Real Rent”
Let’s say a space rents for $20/SF.
In a gross lease, $20/SF may include many expenses.
In an NNN lease, $20/SF might be base rent, and tenant also pays, say, $6/SF in reimbursements.
So the tenant’s total cost might be $26/SF, but the landlord’s “net” could be stronger and more predictable in NNN—assuming reimbursements are collected properly.
The Biggest Beginner Trap: Assuming “NNN Means No Work”
Even in NNN leases, landlords still deal with:
roof and structure responsibilities (often landlord)
capital items vs repairs (lease-defined)
reconciliation and billing
tenant disputes
vacancies (the ultimate landlord risk)
“NNN” is not the same as “hands-off.” It’s a risk allocation framework, not a magic wand.
How Lease Type Impacts NOI (Beginner View)
Gross leases: rising expenses can compress NOI
NNN leases: rising expenses can be passed through (if lease allows)
Modified gross: depends on the exact stop/structure
If you’re underwriting, you need to model:
which expenses are reimbursed
what happens if reimbursements lag
how reconciliations work (annual true-ups)
Retail vs Industrial vs Mixed-Use: Practical Differences
Retail
NNN is common, but leases vary widely. Watch for:
caps on CAM increases
co-tenancy and kick-out rights
tenant responsibility for maintenance items
Industrial
Often NNN-ish, but:
utilities are often tenant-paid
repairs/maintenance allocations can be clearer
buildouts can be specialized
Mixed-Use
Usually blended:
residential is “gross-like” (landlord covers many expenses)
commercial may be NNN or modified gross
This is why mixed-use underwriting requires careful expense allocation.
Beginner Lease Review Checklist
When reviewing a lease, identify:
Lease type: gross / modified gross / NNN
Who pays: taxes, insurance, utilities, CAM, repairs
How reimbursements are calculated and reconciled
Caps/limits on CAM increases
Renewal options and rent escalations
Maintenance responsibilities (roof, structure, HVAC)
Assignment/subletting rules
Default provisions and remedies
Co-tenancy / exclusives (retail)
FAQs
Are NNN leases always better?
Not always. They can be great—if lease language is strong and tenants are durable.
What’s the difference between NNN and absolute NNN?
“Absolute NNN” often pushes more responsibilities to the tenant (even structural), but definitions vary—read the lease.
Do tenants always pay for repairs in NNN?
Not always. Capital items and structure/roof are often landlord responsibilities unless explicitly shifted.
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