The board and the member agencies may provide by contract for the transfer to the board or between member agencies of revenues available from sales tax, property tax, or other sources in order to help finance the cost of paying for services or capital facilities to serve or enhance the development of military bases. The contract or contracts may provide for the transfer of funds to member agencies with responsibility for providing services or facilities within the area of military bases for a specified number of years, and for the repayment of those funds in later years with interest, or for repayment in the form of an equity interest in property, sales, or other tax revenues that may be payable as a result of development occurring within the area of the military base. Any such contract shall be effective only upon approval by the board and the member agencies involved.