Hello this one is disscused since 10 years
it is about ports- queue building build ports in some crazy locatiosn, AIs do the same, same goes for certain type of players.
problem is that if you conquer such a province you can not do anything with that.
so my solution is simple- codding destruction of the buidling could be tricky so what about
"port removal" - which allows you to place port in a new area after lets say 1 day of building and for 2 k wood. it is basaically costs of moving infrastructure and peopel from one place to another.