7-12-4224. Lien arising due to loan from revolving fund. Whenever any loan is made to any special improvement district fund or sidewalk, curb, and alley approach warrants from the revolving fund, the revolving fund has a lien for the amount of the loan on all unpaid assessments and installments of assessments on the district, whether delinquent or not. The lien also applies to all money coming into the district fund up to the amount of the loan, together with interest on the loan from the time it was made, at the interest rate that is borne by the bond or warrant for which the loan was made and that was determined at the time the loan was made, even if the interest rate on the bond or warrant subsequently changes.