Ed. Code, § 16041

If an apportionment is or has been made at any time after September 9, 1953, for construction on a site for which an apportionment was made pursuant to Section 16039, from and after the date the apportionment for construction becomes, or became, final, no repayment deductions by the Controller pursuant to Section 16080 attributable to the apportionment for the site shall thereafter be made, except that any the repayment deductions attributable to the site apportionment which would otherwise be made by the Controller during the fiscal year in which the construction apportionment becomes final shall be made during the fiscal year only. The balance of the principal amount of the apportionment for the site, and accrued interest thereon, shall be added by the Controller to and become part of the apportionment for construction, as of the date of the apportionment, and repaid in the manner otherwise prescribed by this article. The Controller shall promptly notify the governing board of the district and the county auditor of the county, the county superintendent of which has jurisdiction over the district, of any revision required by this section of any previous computation made by him or her pursuant to Section 16089.