So we get the base room at first, a fairly small place, but judging by the amount of stuff we can have inside, and the fact that you get one more tablet after completing the Elsweyr story quests, it gives a guess that you get more fairly sized rooms out of it.

And I now wonder how you go about getting the other two rooms. Are they yet to be released, or do you find them randomly out in the world? Just asking for the sake of clarity, as I am quite interested in seeing what else is there to the house.