(b) The department shall adopt regulations requiring contractors to demonstrate that the amount of interest paid in a year on private sector debt financing for the purposes identified in subdivision (a) does not exceed the value obtained by the state in the use of the facilities during the year for the child care and development services program. The regulations shall include, but not be limited to, the following methods of making this demonstration:

1. (1) Amortization of a loan or lease-purchase contract on a straight-line basis for the purchase price of a portable building, including any transportation charges, installation charges, loan fees, taxes, points or other fees associated with the purchase, over a period of 15 years or more.
2. (2) Amortization of a loan or lease-purchase contract on a straight-line basis for the purchase price of a permanent building and real estate, including any loan fees, taxes, points or other fees associated with the purchase, over a period of 15 years or more.
3. (3) Evidence acceptable to the department that loan payments for the purchase of a portable building or permanent building and real estate, including principal and interest, do not exceed the fair market rental cost that the contractor would have paid if the property was not purchased.