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I suggest we discuss this controversial new feature in this thread. As a reminder, you can convert:
a) cities, and then hire creatures of your faction, while all buildings except unique ones remain;
b) forts, so that they provide full gold income (500/day) instead of half;
c) dwellings, again, to hire "native" creatures.
It seems to me that if the forts and dwellings are justified, then the cities are too unbalanced. I think that for the balance of multiplayer, it would be better if all buildings in the city were demolished. In this case, the cost of rebuilding could be reduced: 1000 gold for a regular building and 2000 for a unique one. In this case, a fully built city with two unique buildings and a Tears of Ashi building would be demolished for 29,000 gold. What do you think?