Yes, that’s Radu’s Coffee Shop, from my Green Lantern run with Darryl Banks, looking very much like a real place.
The photo was snapped by my buddy (and letterer) Troy Peteri while he was visiting Six Flags Magic Mountain in California. The signs, unfortunately, are merely for atmosphere; the coffee shop is only a facade, not actually open. As you can see, there’s also a sign for Coast City around the corner, all window dressing near the Green Lantern ride. Troy reported there were also signs for Ferris Air, Big Belly Burger from the Superman titles, and Planet Krypton from Kingdom Come.
I had no idea such a thing existed before Troy sent me the photo. The signs appear to be taken directly from the original design created and drawn by Darryl and inker Terry Austin. Would be pretty cool to have one to hang in my office…