Hmm what i propose is that you keep the old buildings, but the minor buildings that arent as major such as bought properties( may be deleted under the order of the buyer) and minor projects that are not bigger than #x# but major projects should not be wiped, you also got plenty of room on the server if room is an issue then make another part of the city in another place somewhere else but certain buildings and the make up of the city should stay and not be wiped out unless it is an upgrade to the make up but, do not wipe out the city, also not all the cities only the major ones from faction war, it is as if you are reserving certain landmarks that were very nice and getting rid of the not so nice buildings and structures my example is Brittan and its decade old structures they renewed a few things but kept everything else the same, is what i am basically saying

Maybe the major things that have acted a part in the factions kept as is, they would act as landmarks i think the only reference i remember atm is oasis dome, and vegas army there is more but i cant really remember

I don't consider Vegas an old city, More like the Rebels base, Valor, Hyrule, Cant think of anymore that are left.

I'm almost done restoring Hyrule, few small things need to be done.