...or why what you see isn't always what you get.
Especially in the districts of cities where real estate is very spendy, those wishing to open a new store or expand on an existing store have chosen to create gateways to places elsewhere, whether in another dimension or just linking to somewhere else in JERA where land is much cheaper. It is the best of both worlds, where you shop in the city with rates that are indicative of lower overhead. The MOD Shop uses this technique to put a minimall in a very small space.
The Grunburg military has begun to use this technique to house their garrisons in quarters with doorways to many parts of Asterland, making deployment quick and reducing the numbers of men they need to keep the peace throughout their borderlands.
The early portals linking Grunburg and Alexander served as prototypes that enabled this magic through government funded research.