What is CAM? Common Area Maintenance, explained
CAM stands for Common Area Maintenance. It's the mechanism by which tenants in a shared commercial property, a strip mall, an office building, a retail center, pay their share of keeping the shared spaces running, on top of their base rent.
What CAM actually covers
Shared spaces cost money to maintain even though no single tenant occupies them: parking lots, lobbies, hallways, landscaping, exterior lighting, snow removal, common-area utilities, and often a share of property management fees. Rather than the landlord absorbing all of it, CAM charges split those costs across the tenants who benefit from them.
How a tenant's share gets calculated
The most common method is a pro-rata split based on square footage: a tenant occupying 10% of a property's leasable space typically pays roughly 10% of CAM costs, though the exact formula, and what counts as "leasable" in the denominator, is set by the lease itself and isn't standardized.
The two moments where CAM actually becomes a lease issue
CAM shows up in a lease two ways. First, as a monthly estimate billed alongside rent. Second, as an annual reconciliation where the landlord compares that estimate to actual costs and bills (or credits) the difference, the escalation invoice. That reconciliation step is where most CAM disputes start, since it depends on accurate expense tracking and a lease that clearly defines what's actually included.
Why it's worth understanding, not just paying
CAM is often one of the largest and least predictable costs in a commercial lease, precisely because it isn't a fixed number. Whether your lease caps CAM increases, what's classified as controllable versus not, and what audit rights you have if the numbers look wrong are all real, negotiable terms, not fine print to skip past.
None of this is legal advice. For the deeper mechanics, CAM audit rights covers what you can actually do if a CAM bill looks wrong, and CAM caps covers how increases get limited (or don't). RenewSavvy extracts your lease's CAM formula, cap structure, and reconciliation terms, with the source clause shown next to each one.