HARTFORD — A long-vacant, decaying vintage diner on Farmington Avenue — a Hartford landmark when it was the Comet in the 1980s and 1990s — could make a comeback and supply a b st to revitalization in the city’s Asylum Hill neighborh d.

The chrome and metal diner, which escaped demolition 2 yrs ago, is under brand new ownership. The master sees prospective where today ...