. From the perspective of a commercial property investor as it relates to the income taxes they would pay each year on taxable income earned, depreciation would the amount they pay each year. Further, the annual amount of depreciation they could take each year would over time. a. increase, decrease b. decrease, stay the same c. decrease, decrease d. increase, stay the same . The amount of aggregate principal of a mortgage backed pool that remains outstanding (i.e., not paid down through amortization or refinancings) is known as: a. Overcollateralization b. Pool factor c. Sensitivity analysis d. Marginal rate of return of principal