Dominions 3: The Awakening/Buildings

Buildings
There are three different kinds of buildings you can build to provinces in Dominions 3. The Fortresses can be build by all commanders and they take a number of turn to be completed. Mages can build Laboratories where arcane research, rituals and forging takes place. Building one takes 1 turn of time. Priests can build Temples which spread your Dominion. This action takes 1 turn of time.

Only one fortress, one laboratory, and one temple can be present in each province at any one time. If you dislike the existing fortress, you must tear it down before replacing it.