The one-time Tom’s Diner building is taking a new form once again. Champagne Tiger, a soon-to-be French-American diner, has leased the building at 601 E. Colfax Ave. in Denver that was home for two decades to Tom’s Diner and then, briefly, Tom’s Starlight. Owner Chris Donato said he’s targeting a September opening for his restaurant that will feature specialty pasta and piano nights, as well as drag brunches on Sundays “I’ve always been looking for a diner space.