A modified gross lease is a hybrid lease structure that splits operating expense responsibility between landlord and tenant, rather than assigning it entirely to one party as in a gross lease or triple net lease. The specific split varies by deal — common versions have the landlord cover property taxes and insurance while the tenant pays CAM, or vice versa.
How the split typically works
Because "modified gross" isn't a standardized structure, every lease defines the split differently — there's no substitute for reading the actual expense clause. A common version: the landlord covers property taxes and building insurance (the two costs largely outside the tenant's control), while the tenant pays CAM and utilities.
Another common version splits along a base-year model: the tenant pays a fixed rent that covers the landlord's operating costs as of the lease's first year, then reimburses any increases above that baseline in later years — effectively starting as gross and becoming more like NNN over time.
Common expense splits
| Expense | Common landlord responsibility | Common tenant responsibility |
|---|---|---|
| Property taxes | Often landlord | Sometimes tenant, pro-rata |
| Building insurance | Often landlord | Sometimes tenant, pro-rata |
| CAM | Sometimes landlord | Often tenant, pro-rata |
| Utilities | Rarely landlord | Almost always tenant |
What to watch for before committing
No standard definition
"Modified gross" means something different in every lease — read the actual expense allocation clause rather than assuming a standard split.
Base-year mechanics
If the lease uses a base-year model, confirm exactly which costs are measured in that base year and how increases are calculated afterward.
Double-counting risk
Confirm the landlord isn't billing a cost through both base rent and a separate pass-through — ask for an itemized breakdown.
CAM audit rights
If you're responsible for any pass-through costs, negotiate the right to review the landlord's actual expense documentation.
Comparing across buildings
Because the split varies, comparing two "modified gross" quotes requires normalizing each to the same all-in cost basis.
Escalation interaction
Confirm how the lease's escalation clause interacts with the expense split — some leases escalate the fixed rent portion separately from pass-through costs.
When you need to know this
- Negotiating a multi-tenant industrial lease — where a fully gross or fully NNN structure doesn't fit the building's cost-sharing setup
- Comparing quotes across buildings — needing to normalize different modified gross structures to a common cost basis
- Base-year lease negotiations — understanding how future expense increases will be calculated and billed
- Multi-year lease planning — budgeting for potential cost increases above a negotiated base year
Frequently asked questions
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