The mortgage is not included in the Common Area Maintenance. Common Area Maintenance (CAM) expense is considered the expense for taxes, insurance and maintenance and operation of the Common Areas of a property including but not limited to, shared utilities, community lighting, parking lot repairs, landscaping, etc. A mortgage is not considered an operations expense.
Leases will usually specify what constitutes CAM charges reimbursable by the tenant (lessee) to the owner (lessor).