heh, Ninth Stage you cheater 
yes, it’s Denver (actually Lakewood specifically) and the diner is not only a local legend, it holds a place in my heart. when I was a wee one, my father and I would stop here frequently and have breakfast (no matter the time of day) and listen to music on their 10 cent table jukeboxes.
on a somewhat related note, it’s just up the street from the sole remaining Casa Bonita.
Oooh! A guess the city post. I have been lax. Sadly I had no idea so I kinda cheated with Google and wouldn’t feel right posting the answer now.