"You cannot claim this city because you do not own some of the content used to create it."

> Actually, I'd think that when you go claim a city, if it just deleted the content you didnt have, that would be ideal. In fact, it should delete it and refund the price to plop back to the city.

I've bee thinking about this. You definitely should not get a refund because that's more challenging: but I think better would be to allow you to inherit the stuff you can't build.  And since you don't have the license you can't edit it or add subbuildings.  So that would make you need to turn around and find a deluxe person (or upgrade) to make the building more useful.  It would be  a way to turn Deluxe players into heroes instead of city destroyers as they are now.  

Right now my tiny region has 16 cities, but most of them have been edited by a  deluxe player. Some of htem with the city and villain pack.  5/7 of our group has the standard or limited editions (which are also incompatible) and 2 of the group has deluxe, one with heroes and villains. What this means is that if anyone touches a city it's permanently upgraded or downgraded or sidegraded and unavailable for the original owner. I've lost dozens of hours to building a city only to have one of my friends with deluxe ruin it permanently for me by just claiming it and adding a few roads and a water tower to supply him water--and now I can never play in that city again ~tears~ until they fix this bug.