Alex_R
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No Doublebuild
Players are not allowed to build unit generators in two towns of one kind (does not apply to templates like Balance - always 2+ towns of one race).
Players are not allowed to build monster generation buildings in two identical towns (it doesn't matter if one of them is the starting town or both are secondary towns).
The only nuance is that the summoning portal also counts as a regular building for monster generation. If the main dungeon exists, you cannot build a portal in a secondary town. If there is no main dungeon, you can build a portal in a secondary town, but only once. If there are two or more dungeon-type secondary towns, the portal can only be built in one of them.
P.S. Monsters that have already been built in a secondary town (level 1 or 2) can be recruited without restrictions, even if all secondary towns are the main ones.