CAM Charges, Gross-Up, and the Annual Reconciliation

CAM stands for common area maintenance — the cost of running the parts of a building every tenant uses. Landscaping, parking lot repair, snow removal, common area cleaning and lighting, security, and management of those services. In most commercial leases the tenant reimburses its pro-rata share of those costs on top of base rent, usually monthly against an estimate, with a reconciliation after year end once the actual spend is known.

It varies by lease and that is the point — what a tenant reimburses is a term of their lease, not a rule of the market. Commonly included: landscaping, parking and sidewalk maintenance, snow removal, common area utilities and cleaning, security, and an administrative fee on top. Commonly excluded or capped: capital replacements like a new roof or HVAC unit, the landlord's own financing and depreciation, costs of leasing space to other tenants, and repairs covered by insurance or warranty. Taxes and insurance are usually reimbursed too but are typically stated separately from CAM rather than inside it.

Pro rata by square footage: the tenant's rentable area divided by the building's, applied to the recoverable pool. A 10,000 SF suite in a 100,000 SF building carries 10%. What varies is what goes into the pool and whether the lease structure passes all of it, some of it, or none. A triple net lease passes the full share. A gross or full service lease passes only the amount above a base year. A modified gross lease passes the amount above an expense stop quoted per square foot.

A gross-up clause lets the landlord calculate variable expenses as if the building were fuller than it is — commonly 95% occupied — before allocating them. It exists because of a real unfairness: costs like cleaning and utilities scale with occupancy, so in a half-empty building the per-tenant share of those costs collapses, and it would leap the year the building fills up. Grossing up smooths that, and protects the landlord from absorbing the cost of vacancy through the recovery calculation. Only variable costs should be grossed up. Taxes and insurance do not move with occupancy, so grossing them up overcharges the tenant.

The landlord may allocate more than they spent on the variable pool — that is exactly what grossing up does — but the provision should never let the total allocated exceed what was actually spent once the building is at or above the gross-up occupancy. If a building is 97% occupied and the clause grosses up to 95%, the gross-up does nothing. Any calculation that still inflates the pool at that occupancy is wrong, and it is worth checking, because it is an error that looks like arithmetic rather than like overreach.

Tenants pay CAM monthly against an estimate. After the year closes, the landlord compares what was collected to what was actually spent and issues a reconciliation — a bill for the shortfall or a credit for the overage, with a statement of the underlying costs. It is the one moment each year when the estimate meets reality, and it is where most CAM disputes start.

Five things. That the pro-rata share matches the lease's square footage, not the building's current occupancy. That every cost in the pool is a category the lease actually makes recoverable. That capital items have not been expensed in full rather than amortized. That any cap or exclusion in the lease has been applied. And that the gross-up, if there is one, was applied only to variable costs and only while the building was below the gross-up occupancy. Most reconciliation errors are one of those five, and none of them are visible without reading the lease alongside the statement.