It appears Steak n Shake will be updating its stores with a stylish, sleek look. The Indianapolis-based burger chain unveiled the change at the annual convention of the International Council of Shopping Centers, which runs through Wednesday in Las Vegas. The new look likely will be introduced in California, according to a Steak n Shake spokesman at the convention, who said more details weren’t readily available. In any event, Sardar Biglari, who operates San Antonio-based Biglari Holdings Inc., parent of the iconic chain, wants the public to know who owns Steak n Shake, judging from the signage. Whether customers prefer the new look remains to be seen. But a long line of convention attendees waited patiently for samples of the restaurant’s popular milkshakes. Steak n Shake shareholders elected Biglari CEO in 2008, and the company now is operated by Biglari Holdings. Biglari operates 496 Steak n Shake restaurants and 92 Western Sizzlin restaurants. Eighty-two of the Steak n Shake and 87 of the Western Sizzlin units are franchised.