I was perusing the dev tags to see if anything came close to housing and the best I could come up with (and it's a weak relationship at that) is... dev1002 - Storylines and World Quests or dev1003 - Grand Companies quest.

Getting a house could be a reward or perk for completing some important world quest. It might work well with the Grand Companies they plan to add. Do enough work for them and they'll throw you this bone. Of course, there's a weekly upkeep that needs to be paid and they don't take gil, only Grand Companies specially printed coins.