Per this NY Times article, the average American knows around 600 people.https://www.nytimes.com/2013/02/19/science/the-average-american-knows-how-many-people.html#:~:text=The%20average%20American%20knows%20about,do%20you%20know%20named%20Kevin%3FPer the US Census Bureau, the average American moves 11.7 time in their life, which based upon an approximate lifespan of 84 years, works out to be about every 7 years.https://www.census.gov/topics/population/migration/guidance/calculating-migration-expectancy.html#:~:text=Using%202007%20ACS%20data%2C%20it,one%20move%20per%20single%20yearSo, if the average American knows 600 people and they each move about every 7 years, that means that the average American knows around 85 people that move in any given year.How many of those moves do you want to be involved in?

Unfortunately almost every franchise involves renting the occupied space when the property would have made more money than the business.

You bet.

You could certainly reach this demographic, but it could also cost you substantially more than the return.For the money, your best bet is probably a dedicated website for your property with the key words that you want to convey.

“How” they live together is more involved.

And this does not even involve business or real estate!

My involvement would go down drastically to where the only thing I'm doing would be funding the deals.  

Understand the fees involved and calculate the total cost for an entire year of management so you can compare the different managers.

Are there going to be banks involved, creative seller financing or all cash? 

If you're looking for the cheapest route, conventional may be a better bet.