CAM Cap

A CAM cap limits how much a tenant’s recoverable expense share can rise from one year to the next. It is one of the most heavily negotiated protections in a commercial lease and one of the easiest to apply incorrectly.

The three variables

Every cap is defined by three things, and leases vary on all of them:

1. The rate — commonly 3% to 6% per year.
2. The reference — measured against the base year, or against the prior year’s actual billable amount.
3. The behavior — cumulative or non-cumulative, compounding or simple.

Cumulative versus non-cumulative

A non-cumulative cap resets annually. If expenses rise 2% in a year with a 5% cap, the unused 3% is lost.

A cumulative cap lets unused headroom carry forward. After a 2% year, the following year’s ceiling absorbs the unused 3%, allowing up to 8%. Cumulative caps favor the landlord over a long term, because low-inflation years bank capacity for high-inflation ones.

Compounding caps apply the rate to the escalated prior ceiling rather than the original base, which grows the ceiling faster still.

Order of operations

This is where spreadsheets most often go wrong. The cap is tested after the base-year deduction, not before.

Applying the cap to the full tenant share rather than the post-base-year amount produces a higher ceiling and lets through a larger increase than the lease permits. The error is invisible in a workbook because there is no record of which order was used — which is precisely why an auditable trace matters.

What is usually capped

Caps typically apply only to controllable expenses — janitorial, landscaping, management, security. They almost never apply to property taxes, insurance, or utilities, because a landlord cannot control a tax reassessment or a utility rate increase.

That distinction is normally implemented by putting controllable and non-controllable costs in separate recovery pools, each with its own cap setting.

Test cap behavior against your own figures in the CAM reconciliation calculator.