It would be really cool for player’s merc company to be able to gain ownership of cities, forts, villages etc. Receive a monthly tax per owned city/town/fort. ability to invest in them to add new buildings to increase tax rev and add items to shop / services in the city. Also ability to create patrols and companys which can assist players in combat ( including conquering new cities/towns/forts).
To ease the player into having ownership of location, maybe have a quest from a noble house that states they cannot pay you in coin but will give you a village of your own upon completion of contract ( contract should be somewhat difficult).
obviously you can expand on these options, this was just a general idea. would be cool if the player unified ( through force) the realm before a orc or undead crisis.