After graduating from UA, since your class was a pack they had their own pack grounds with many other students and people also, Katsuki and Eijiro being the head alphas of the group. All pack members houses were all in the same area of the city and specifically stayed in that area. They all lived in separate houses but the ones that were already coupled or weren’t coupled but liked each other enough stayed in the same houses. The head alphas of the pack though for each omega could come to them and be their comfort, them being the only other ones if the omega had a mate to be able to scent and hold and calm them.