S.D. Codified Laws § 43-25-22
Any unincorporated religious, benevolent, fraternal, charitable, or educational association may mortgage or convey any real estate which is owned by such association by adopting a resolution directing such mortgage or conveyance, which mortgage or conveyance shall be executed by a majority of the board of trustees or directors, or by the presiding officer, and shall be attested by the secretary of the association; provided, however, that any such resolution may be adopted at a regular meeting of such association, or a special meeting called for such purpose, and that notice of such proposed action shall be published in a newspaper of general circulation in the community in which such association has its place of meeting, once each week for two successive weeks prior to such meeting.
SDCL 43-25-22