Rent is typically one of the largest expenses in any business operating budget, and, therefore, it is important to have a clear understanding of what your organization is paying for each month. Whether you are leasing a full floor of Class A office, a large warehouse in the suburbs, or a small retail shop, you are also paying for the upkeep of the property where your space is located. These costs have a number of names in commercial real estate – additional rent, operating expenses, CAM charges – and landlords pass these expenses through to their tenants.