Campus is a startup doing interesting things related to communal living and groups housing. http://buildcampus.com

I had a chance to meet the founder. They're targeted to the younger crowd. Recent grads moving from dorm life to city life with nothing in between.

I think I you can get some of the benefits of "group living" from having roommates. I was fortunate enough to land in two great roommate situations in my early and mid 20s. I suppose a startup jumping into a fragmented market makes sense.