I guess the light rail construction killed them. I was a couple miles south of there yesterday and decided that it would be what I wanted for a late lunch. Showed up only to find it was closed down and they were moving the equipment out the back door.
I had to figure it was only a matter of time since the few times I've been in recently, they weren't particularly busy and what I couldn't help but notice is that their building is right in the line of the track for the next extension. That's not to say they couldn't move, but given the website simply no longer exists, I don't see that happening.
It kinda sucks since there really isn't anything like this place elsewhere in the area. Get over towards Metrocenter, there's some chains but they're chains. They did make a pretty good burger here even if the place smelled funny and always seemed to have a greasy floor.