To effect such forfeiture the board of county commissioners shall cause to be served upon the purchaser or his legal representative or assigns a notice specifying the conditions in which default has been made, stating that such contract will terminate thirty days after service of such notice or at the expiration of three months after the default, if that time has not already expired, unless prior thereto the purchaser shall comply with such conditions and pay the costs of service.
SDCL 7-31-26