09/08/2026
Most commercial lease teams know their escalation structure. Fewer know the one detail that changes how much it costs them over the life of a lease.
A non-cumulative cap limits increases to the agreed ceiling in each year, with no carryover. A cumulative cap allows a landlord to bank unused escalation from a low-inflation year and apply it in a future year, which can produce sudden and unexpected rent increases.
One word. Different clause. A tenant paying under a cumulative cap structure during a low-inflation period can face a significantly larger-than-expected increase when the landlord exercises the banked headroom.
If a CPI escalation is applied using the wrong index and understates the increase by 1.5%, that shortfall becomes the new base from which every future escalation is calculated. Over a five-year lease term, a compounding calculation error that starts small represents a material revenue shortfall by year four or five.
The detail that creates this exposure is almost always an abstraction issue - the cumulative vs. non-cumulative modifier sitting in a sub-clause that wasn't captured at ingestion.
Does your lease administration process capture the escalation modifier, not just the escalation rate?