It's definitely set in the same world as T&B, but besides the fact that it seems to take place in a different city, there are a lot of hints that point to DD actually taking place way back in the past from when T&B takes place.
The hint I noticed straight away is that in the first or second episode, there's a newswoman who appears on a screen for a brief moment, and her name which is shown underneath is "Agnes," the same name as the producer of HERO TV from Tiger & Bunny. Of course, she looks much younger, but it looks to be the same person. If that isn't enough, the news in DD always appears on a channel with the banner "Apollon Media," which is the company that owns and runs HERO TV in Tiger & Bunny.
Also, while things do seem to be somewhat advanced in DD, there are subtle things like the TVs being in black and white and everything in general just being very "retro" in contrast to the futuristic feel of Stern Bild in Tiger & Bunny.
In fact, Lisvalletta might even be a past Stern Bild altogether. There's a mention of Stern Bild having suffered a flood disaster in the past, which caused it to adopt that "multi-layer" structure, where it looks like they literally built a city on top of another city. What I'm thinking here is that the bottom part that was hit by the flood is Lisvalletta, and then post-flood-reconstruction caused it to be completely redesigned and renamed as the Stern Bild known in T&B.
There's also the large tower that they keep on showing in DD, where the police force is located, which looks extremely similar to the Justice Tower in T&B, minus the top part which could have been replaced by the "Goddess of Justice" statue after the flood disaster.
Another more subtle connection is the fact that Greek mythology appears in both series; you have the five major companies in Stern Bild all being named after Greek gods (Apollon, Titan, Kronos, Helios, etc.,) and the "prayer" Cooper mentioned in DD had to do with Prometheus, also a Greek god, and there's also the name of the other "sun" or the planet Kirill came from, Nikai, in Greek mythology meaning the creatures that were under the control of the goddess of victory Nike.
Another fun one I noticed toward the end of episode 13 were Derrick's shoes that were given a very deliberate close-up; they're the exact same pair of shoes that Kotetsu wears in T&B! Does it allude to the fact that Derrick might be related to Kotetsu and the shoes were passed down? Or did they just both coincidentally have very similar old-timey taste in clothes? I don't know, but it's interesting to see either way lol.
I'm sure there's a lot more hints other than the ones I listed, and at this point I'm sure a lot of people already figured them all out, but this was all written from the top of my head as soon as I finished Double Decker and I didn't bother looking into it any further, just wanted to list out what I personally noticed :D
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