For his first two years here he stayed in a rooming house, because he couldn’t afford his own house or apartment.After World War II this country “got rich”, affordable housing became plentiful as “the suburbs” were developed.  

Are you setting a one person per room limit? 

When rented, we lock all interior bedroom doors aside from the bedroom we are renting by the room and sync the calendar with the main house's calendar.

You need to make sure you understand every detail: how the lease terms adapt over time, what kind of negotiating room you’ll have when it’s time to renew, and whether lenders in your area are open-minded about financing these kinds of ground leases.

With just 5% down (yes, I paid PMI initially), we moved into the main bedroom, used the small first-floor room as my office, and rented out the other three bedrooms on Airbnb and Furnished Finder.

Larger families, remote workers, or investors could see it as ideal, especially if local schools or amenities like parks, dining, or entertainment are strong.

So you each spend a few grand on a mediator and then work it out.

You can give notice to one of the tenants, then move in and rent out rooms to further cut your living expenses.Yes, something I've considered but does require me to move from CA to TN, so big life change. 

Boiler room  operation ? 

Hire a PM for the townhouse if you're doing a LTR and not a by the room situation.