Yes, I think this would be the case. If you capture another city with it already built, it doesn't get demolished, but if you raze the city it adds 1 to the count that you can build. I don't see why it can't be if number of Towers of Dominion (or whatever building) is greater or equal to one (or any other positive number) no more are allowed to be built, rather than incrementing the counter when a city with the building is razed. Derek, is this feasible?