I know it's a lot of work but I wanted to put this suggestion somewhere in case I'm not the only who would be really interested in something like this.

Fantasy/Medieval Cities; Looking like castles and Villages.
Quest/Adventurer Guild building to accept jobs for money. Inn/Food Stalls/Restaurants.

Buying plot/land from the city to construct upon. (Like being able to put down a settlement right next to the city without hostility) could have a house already on the land etc.