For rental properties, an appraiser will typically use the Income Approach to estimate the property's value. This method is based on the income-generating potential of the property, which is most relevant for investment properties, including rentals.

The Income Approach assesses the property's ability to generate future cash flow by evaluating the income that can be derived from renting it. The formula often involves determining the net operating income (NOI) and applying a capitalization rate (cap rate) to estimate value.

This method is most appropriate for rental properties because their value is inherently tied to their profitability.

Other methods:

Cost approach: More suited for unique properties or new construction.

Sales comparison approach: Often used for owner-occupied properties, comparing recent sales of similar properties.