5. Cost Benefit Analysis Calculation. 6 points. The property manager of a 10-unit 8,000 square foot apartment building is contemplating adding central air. Current rent for all apartments is $900/ month. The property manager estimates they could increase rents to $910/month if they had central air. Central air would cost are $2,500 for a 2000 square foot zone (including installation). The owner's cap rate is 7% and the apartment building is 90% leased (there is one vacancy) What is the payback period? What is the increase in property value? Should the property manager recommend this project to the owner? Why