(a) If the legislative body finds that all of the following conditions are satisfied, it may approve and confirm the report prepared pursuant to Section 9523 and proceed to authorize, issue, and sell refunding bonds pursuant to Chapter 3 (commencing with Section 9600):

1. (1) That each estimated annual installment of principal and interest on the reassessment, as set forth pursuant to subdivision (d) of Section 9523, is less than the corresponding annual installment of principal and interest on the portion of the original assessment being superseded and supplanted, as set forth in subdivision (c) of Section 9523, by the same percentage for all subdivisions of land within the district. Any amount added to the annual installments on the reassessment due to a delinquency in payment on the original assessment need not be considered in this calculation.
2. (2) That the number of years to maturity of all refunding bonds is not more than the number of years to the last maturity of the bonds being refunded.
3. (3) That the principal amount of the reassessment on each subdivision of land within the district is less than the unpaid principal amount of the portion of the original assessment being superseded and supplanted by the same percentage for each subdivision of land within the district. Any amount added to a reassessment because of a delinquency in payment on the original assessment need not be considered in this calculation.