S.D. Codified Laws § 51A-4-20.4
A bank may make investments designed primarily to promote the public welfare, including the welfare of low and moderate income communities or families. A bank may make such investments directly or by purchasing interests in an entity primarily engaged in making such investments. No bank may make any such investment if the investment would expose the bank to unlimited liability. The director shall limit a bank's investments in any one project and a bank's aggregate investments under this section. A bank's aggregate investments under this section may not exceed an amount equal to the sum of five percent of the bank's capital, surplus, and undivided profits, unless the director determines by order that the higher amount will not pose a significant risk to the bank and the bank is adequately capitalized. In no case may a bank's aggregate investments under this section exceed an amount equal to the sum of ten percent of the bank's capital stock actually paid in and unimpaired and ten percent of the bank's unimpaired surplus fund.
SDCL 51A-4-20.4