S.D. Codified Laws § 11-8-7
It is hereby found and declared that there exist in municipalities of the state slum and blighted areas, as defined in §§ 11-8-2 and 11-8-3, which constitute a serious and growing menace, injurious to the public health, safety, morals, and welfare of the residents of the state; that the existence of such areas contributes substantially and increasingly to the spread of disease and crime, constitutes an economic and social liability imposing onerous municipal burdens which decrease the tax base and reduce tax revenues, substantially impairs or arrests the sound growth of municipalities, retards the provision of housing accommodations, aggravates traffic problems and substantially impairs or arrests the elimination of traffic hazards and the improvement of traffic facilities; and that the prevention and elimination of slums and blight is a matter of state policy and state concern in order that the state and its municipalities shall not continue to be endangered by areas which are focal centers of disease, promote juvenile delinquency, and consume an excessive proportion of its revenues because of the extra services required for police, fire, accident, hospitalization, and other forms of public protection, services, and facilities.
It is further found and declared that certain slum or blighted areas, or portions thereof, may require acquisition, clearance, and disposition subject to use restrictions, as provided in this chapter, since the prevailing condition of decay may make impracticable the reclamation of the area by conservation or rehabilitation; that other areas or portions thereof may, through the means provided in this chapter, be susceptible of conservation or rehabilitation in such a manner that the conditions and evils hereinbefore enumerated may be eliminated, remedied, or prevented; and that salvageable slum and blighted areas can be conserved and rehabilitated through appropriate public action as herein authorized, and the cooperation and voluntary action of the owners and tenants of property in such areas.
It is further found and declared that the powers conferred by this chapter are for public uses and purposes for which public money may be expended and the power of eminent domain and police power exercised; and the necessity in the public interest for the provisions herein enacted is hereby declared as a matter of legislative determination.
SDCL 11-8-7