Final answer:
To make an adjustment for the value difference between the subject property and comparable property A, you can use the concept of depreciation and comparative market analysis.
Step-by-step explanation:
In order to make an adjustment for the value difference between the subject property and comparable property A, you can use the concept of depreciation. Since the comparable property has a three-car garage instead of a two-story garage, it has an additional feature that can increase its value. However, the difference in value between a two-story garage and a three-car garage may not be exactly $2000. To make an adjustment, you can use comparative market analysis to determine the value difference of similar properties and make an appropriate adjustment based on this analysis.