Steak 'n Shake has permanently closed 57 restaurants amid slumping sales during the coronavirus pandemic. The Indianapolis-based casual restaurant chain announced in the latest earnings report by its parent company, San Antonio-based Biglari Holdings Inc., that it has closed 51 corporate-owned locations and six franchise-owned locations. Biglari Holdings reported impairment charges of $10.3 million as a result of closing the 51 locations, according to the report. "The COVID-19 pandemic had an adverse effect on our restaurant operations, thereby resulting in the evaluation of company operated restaurants for recoverability,'' the report states. The company also sold one location to a franchisee and 10 locations to operating partners, reducing its total number of restaurants to 553 from 624 a year ago. Steak 'n Shake has been offering takeout, delivery and drive-thru options since closing its dining rooms nationwide on March 17 as a result of the pandemic.