Bought 1 big house with two tiny houses behind it for $105K had $2K closing costs.. 

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. 

Could be a tiny bit could be a lot, but definitely seems worthwhile to ask some veteran landlords what the impact will be.

It's a tiny house and I got a great deal on it, but it needs some work.ictures are below.

Not sure you will have too many others who can give first hand insight on the topic here in SD, as this would be the first tiny home community in the area that I'm aware of. 

240 units @ $60 monthly = $14,400$14,400 * 12 months = $172,800 gross profitIt's like have 240 tiny apartments for rent, OOOO, I'm In, getting on this tomorrow..

B class off market rentals with distresed sellers will result in a lot different quantity than buying turkey, sorry, 'turnkey' OOS at full retail or buying A class off the MLS vs d class hood junkers.  

She luckily has a lot that will accomadate another residence and we are going to build her a tiny home, which once built should create enough income for her to quit her job and just manage the two rentals.  

How did you come to the 2400 SF quantity?