One of Denver’s most iconic diners could be changing hands soon. After 20 years of business, Colfax late-night staple Tom’s Diner is for sale. Tom Messina, the greasy spoon’s owner and namesake, put the diner on the market late last year. The half-acre lot is listed at $4.8 million. In Denver’s hot real estate market, it’s no surprise that the land has already attracted some serious offers.