This is like an epidemic right now, with a ton of stores closing all the time. I know this one in Little Rock is still opened but many Denny's Restaurants have been closed in last year or so. I know that things are not going that well but I would never suspect that the end is going to come so quick. I worked at Denny's in the 90s and things were good and they were opening stores, not closing them.
If you are looking for good indicators if a store will be closed, just look at what's happening every Sunday morning, if a restaurant can have a decent number of customers at that time, all will be fine.