S.D. Codified Laws § 5-12-37
An accurate record shall be kept of the rental payments under each lease entered into by the Building Authority and any officer, department, board, commission, or other agency of the State of South Dakota, or the commissioner of administration when requested to enter into such leases as provided in §§ 5-12-13 to 5-12-16, inclusive, and when the rentals applicable to each project or facility, or any combination thereof, acquired, constructed, completed, remodeled, maintained, and equipped have been paid, in amounts sufficient to amortize and pay the principal of and interest upon the total principal amounts of bonds of the authority issued to pay the cost of each project or facility, including maintenance and operation expenses and that proportion of the administrative expense of the authority as provided for by each lease, the property shall be conveyed without charge to the lessee.
SDCL 5-12-37