The Sugar Bowl Restaurant, at 1494 Miner Street (U.S. Route 14) in Des Plaines, Illinois, was opened by Mr. and Mrs. Files as a soda fountain and candy store in 1921. They added a glorious neon sign in 1957.
It still retained some of its old features as a candy store when I visited as a kid in the late 1980s (I remember browsing the knickknacks and candy they sold), but owner Ted Vlahopoulos renovated the interior to look more like a traditional restaurant in 1997. Thankfully, Steve Morakalis and George Prassas kept this wonderful sign when they reopened it in 2009.