CAM Reconciliation Calculator

Common Area Maintenance year-end reconciliation for commercial leases. Deterministic, 100% client-side. Verify against your specific lease language.

Inputs
Or override % directly:
Reconciliation
—
Pro-rata share—
Grossed-up variable—
Recoverable pool—
Tenant gross share—
Less base/expense stop—
After cap on controllables—
Less estimated paid—

Gross-up scales variable expenses to the target occupancy: variable × (target ÷ actual). The cap limits the tenant share to prior-year × (1 + cap%). True-up positive = tenant owes; negative = landlord refund.

About the CAM Reconciliation Calculator (Commercial Lease)

Commercial real estate managers and tenants frequently dispute the allocation of annual operating expenses. A CAM reconciliation calculator determines the exact Common Area Maintenance true-up by analyzing pro-rata shares, base-year stops, and gross-up provisions. This rigorous calculation ensures fair, contractually accurate distributions of property taxes, insurance, and maintenance costs under triple-net or modified-gross leases.

How it works

  1. Input total actual building operating expenses for the year, categorizing controllable and non-controllable costs.
  2. Enter the tenant's exact rentable square footage to determine their pro-rata share of the building.
  3. Apply lease-specific constraints such as base-year stops, gross-up percentages, or controllable expense caps.
  4. Calculate the difference between the tenant's estimated monthly prepayments and actual final expenses to find the true-up balance.

Frequently asked questions

What is a base-year stop in a commercial lease?

A base-year stop means the landlord pays all operating expenses up to the total amount incurred during the tenant's first year. The tenant is only responsible for their pro-rata share of increases over that base year amount in subsequent years.

How does a gross-up provision work?

If a building is partially vacant, variable expenses (like utilities or janitorial services) are artificially 'grossed up' to reflect what they would cost if the building were fully occupied (e.g., 95%). This prevents fully leased tenants from subsidizing vacant space costs.

What is a cap on controllable expenses?

A lease may limit how much certain expenses (like property management fees or landscaping) can increase year-over-year, often capped at 3% to 5%. Non-controllable expenses, like property taxes and insurance, are rarely capped.

What happens during a CAM true-up?

At the end of the year, actual expenses are tallied against the estimated CAM payments the tenant made monthly. If actuals exceed estimates, the tenant owes a true-up payment; if actuals are lower, the tenant receives a credit.

References