If you want an ADU, buy a property with an adu.  

Investment Info:Single-family residence buy & hold investment.

I do not know what their price tag is, buy Kohler (Mark Kohler) and his company set up trusts and they are VERY AFFORDABLE and do great work.

It by no means is an exhaustive search but I also haven’t seen any co-op communities selling for 50% of comparable condos.I also know lenders that have originated loans for the co-ops in Laguna Hills and I was also reading how Fannie Mae buys mortgages issues to co-ops so it sounds like there’s a market for both qualified and non-qualified loans.

so: buy a house. 

Investment Info:Condo buy & hold investment in Ashburn.

So back to being a real estate investor: the only way to be one is to buy a property and create value out of it, whether through finding a below market value house and selling for a profit, or renting and creating cash flow.  

We all invest in real estate in order to make money, and keep in mind that someone who can only afford to live in a mobile home and seller-finance to buy the land is probably tight on funds. 

I would never buy a home in a flood plain. 

He'll still be renting - just from you instead of others, and at all the costs to you that you have enumerated.Your son doesn't "need" to buy a house.