So fat I have three houses in black city and 5 people and the main hall. Can you get any more things in there?
Yea, you can get a maximum of 45 residents in Black City by talking to people in White City via Entralink. You will know if you have the maximum buildings if you can find the Market which sells Elemental Stones. You can battle only 12 trainers repeatedly and the rest only once. Look at this for more info on Black City: