I added 'extra' / separate living qtrs to my main house.
I like having someone around to take care of the place and feed the animals when I travel.
The extra dough helps too. (In future I will barter for 'care' if I need it). I will probably move into 'smaller of the spaces'. (Each is ADA accessible).
I always keep 2+ living qtrs at each home (and / or buy the neighbor house). 30+ yrs of caregiving for a disabled parent, and seeing 'boomerang' kids (returning to parents) led me to this conclusion.
I also keep a set of double duplexes that are 'senior apartments'. (In case I have to move to town (unlikely).
I appreciate the 'expense write-off' of multiple rentals (be careful with this on main home! When / if you sell you will have to recover depreciation and exclude capital gain exclusion on the part of your home that is rented out). I use the term 'boarders'. (some shared space / services)
definition from 'down-under'.
Difference between a boarder, lodger and tenant - askUWA