S.D. Codified Laws § 5-12-47.2
The South Dakota Building Authority may enter into an irrevocable escrow agreement to provide for the defeasance and payment of the series 1993A lease revenue trust certificates, the series 2005B bonds and the series 2008 bonds issued to finance the costs of the buildings and other real or personal property described in subdivisions 5-12-47.1(1), (2) and (3). The authority may enter into such other arrangements to pay or prepay, from time to time, any governmental expenses permissible under chapter 5-12, including payment or prepayment of debt service and associated fees and expenses relating to series 2010B bonds issued to finance the costs of the buildings and other real or personal property described in subdivision 5-12-47.1(4). The authority may contract with a third party for any of the purposes of this section. Upon determination by the authority of the amounts necessary for payment or prepayment of the bonds and other governmental expenses described in this section, and any associated fees and expenses, any remaining funds shall be transferred to the general fund at the end of the fiscal year in which SL 2014, ch 35 was enacted. Thereafter, as of the end of each fiscal year to and including the fiscal year ending June 30, 2021, the South Dakota Building Authority shall file an annual report with the Bureau of Finance and Management specifying any lease rentals, any fees received pursuant to § 5-12-47.1 and this section, and any interest earnings thereon, which the authority has determined are no longer expected to be required for the purposes set forth in § 5-12-47.1. Any such amounts not then expected to be required shall be deposited into the general fund with thirty days of the filing of the annual report. Any lease rentals and fees received by the authority pursuant to § 5-12-47.1 and this section, or interest earnings thereon, which are not applied by June 2, 2021, to pay or prepay amounts described in this section, shall be deposited into the general fund by June 30, 2021.
SDCL 5-12-47.2