Costs associated with a building or a property that landlords pass on to tenants for the upkeep of common areas and amenities. CAM charges vary widely based on the type of property and its location, and can cover a broad range of expenses that landlords pay, including repairs, insurance, property maintenance, and in some cases administrative salaries. What is considered a common expense is often resolved by negotiations between the tenant and landlord, and these costs are typically specified in the lease agreement.