Clayton Morris is fond of saying that a clogged toilet is the worse thing you would have to face as an absentee landlord.

I don't manage property because I don't want to show up when a toilet is plugged.

For example think of toilet paper during early covid days.

The turf ends up smelling like a permanent dog toilet. 

The dreaded call "toilet and shower is clogged and wont drain".

@Michael Kugler It's probably because he's off grid using a macerator toilet (like on boat heads).

As the problem has continued, the plumber recommends a macerating toilet – think toilet attached to a garbage disposal.

Another possibility is that the problem is what the tenant is flushing down the toilet.

First, a macerating toilet that can use the drain pipe the washing machine used to use ($3,400 including the Liberty Ascent II toilet) or an ejector pump, which would be installed in the storage room on the other side of the wall; the pump option would of course require jack-hammering to create the pump pit ($1,200, I would supply the toilet). 

Updated doors, locks, toilets, and light fixtures if necessary.