Whenever Reed and Malloy head east on Moorpark at Tujunga, there is usually a glimpse of a red barn-like building in the background. That was the Firehouse eatery at 4389 Tujunga.
Two episodes offer a much better look: "Log 88-Reason to Run" (S3, Ep25) and "Anniversary" (S4, Ep9).
"Log 88-Reason to Run" shows the Pickwick complex (ice rink, bowling, and apparently horses at one time) on Riverside in Burbank. And yes, it has just been sold to developers. I had a bad experience at that ice rink anyway... Why do they call those things for children to hang onto "Bobby Seal(e)" like the Black Panther? I tell a lie! The ice rink gets to stay, but the bowling alley will be Monster Boxes.
The episode features Randy Mantooth and Dick Whittinghill. It also has these views of the Firehouse as it was in 1971. Since that time other things have occupied the location. Most recently, it became the new location of Henry's Tacos. You can read about the Henry's Tacos situation here and here.
In Adam-12 wormhole fashion, Malloy spins the car around on Ventura and Radford and somehow ends up at Adam-12 Square, Tujunga and Moorpark. Then he reunites with Reed and catches the bad guy just *like that* because EDITING.
After the waitress at fake "Danny's" is safe again, she contemplates working at the very real Du-Par's across the street. Not really. She's an actress. The waitress thing is just her part-time gig. It must be torturous to be one of those hopeful aspiring actors who has to work with food while trying to make it, and then to get a part on TV, only for it to be playing a food worker. But hey, it's on TV! [Cut to Janet Gaynor telling the Central Casting woman, "But maybe I'm that one."]
From "Anniversary" in the next season, we get these views of the Firehouse.
Both episodes named in this post contain some other interesting things, but this post was all about that unusual red barn-looking food place, The Firehouse on Tujunga. [Non-Angelenos note: "Tuh-HUNG-ga"]