What is a base year in a modified gross lease?
The base year sets the operating-expense level the landlord covers. In later years you pay your share of increases above it, so a low base year costs you more.
The base year is the first year of the lease, whose operating-expense level sets the baseline the landlord agrees to cover.
In every year after, you pay your proportional share of the amount by which expenses rise above that base-year level, while the landlord continues to cover the base. This is common in modified gross and full-service leases. The trap is an artificially low base year: if a landlord sets it in a year with unusually low expenses, your share of increases starts sooner and runs higher. Confirm the base year reflects a normal, fully-assessed year, understand which expense categories are included, and negotiate a cap on how fast your share can grow.
Related FAQ terms
Next Steps
Have more questions?
We’re happy to walk through your situation.
Oops! Something went wrong while submitting the form.
What to expect:

- Tenant & owner occupied representation
- Healthcare & service-focused
- Chicago & suburban markets