Linking buildings to the city type. Auto-translated

Gentlemen, I've encountered a problem... I decided to create my own map, and I kind of cobbled it together "from what I had," but I've run into an issue. There are 4 castles, and I've set it to random (so that you can choose a race in the game itself, but this doesn't affect the question), and each castle has buildings of level 1 and 2, where additional units can be recruited. So, how do I link the buildings to the castles so that when a castle is chosen, the appropriate building is available (in other words, I'm playing as Dwarves, but there's a Necropolis on the territory)?

We place a random building, open it with the spacebar, and there is a setting at the bottom to link it to a specific town.

Yes, it helped, but I meant something else... I probably didn't explain it correctly... Basically, buildings shouldn't be tied to a city from the very beginning (the status should be neutral), BUT the buildings themselves should match the city's race (if a Mage Castle is in the desert, then the buildings should be for Gargoyles and Gremlins, but not for Imps and Archers). I hope I explained it more clearly this time. :smile24:

There, we add a random building that allows hiring units without a level requirement; we link it, and a random city faction will appear.

Added 32 seconds later
We make it neutral in the same place.