Final answer:
To calculate NOI, subtract total operating expenses, including both fixed and variable costs, from EGI. The appraiser must estimate these costs accurately, even if they differ from the property owner's previous expenses, to ensure a reliable valuation.
Step-by-step explanation:
To determine the net operating income (NOI), we must subtract the total operating expenses (TOE) from the effective gross income (EGI). Operating expenses can be broken down into fixed and variable costs, both of which must be considered by an appraiser when estimating expenses for an appraisal.
In the context of the question, the example highlights that the appraiser should include a reserve for painting and decorating as a variable expense in the appraisal, even if the property owner has not incurred such expenses recently. Such a process ensures a credible NOI, which in turn is capitalized to estimate the property's value.