Maybe a bit off-topic, but I have a relatively close example of what you are talking about. An older friend of mine got together with his childhood friends and

Maybe a bit off-topic, but I have a relatively close example of what you are talking about. An older friend of mine got together with his childhood friends and built a retirement home, they essentially built a small building with small, private apartments (1 bedroom, bathroom, kitchenette and small living room), common areas and so on... Now that they are all retiring (this friend of mine retired 3 years ago), they are all going there, each couple having their small apartment but being able to socialize whenever they want. Plus, they even have a kitchen service, cleaners, etc, etc because the shared cost is way less of what they would pay to have it at home or what they'd pay in a normal retirement home. Been thinking that I wouldn't mind doing something like that...