Be ready for a list of deferred maintenance though,  when people pay tiny amounts, they won't  tell the landlord about anything because they fear rent increasing- but when they are paying more (even below market rate), they want stuff fixed that they overlooked for likely years. 

I want to get to a point that I am comfortable with the units I have (i.e. they are the right ones, in the right quantity, and will provide sufficient income when paid off) then work on paying them off. 

Search "Tiny Homes" on meetup and there's a couple of good local groups.