On the other hand, your rent payment will be part of the investment property income, so the numbers may work.Example:A fourplex costs $500,000.

@Logan M. as a NON eXp person, I'd like to chime in. 

How much is your mortgage payment on House A?

Does the basis remain in place since the seller would presumably hold the title until the payments are complete?

➡️ Are all the non-renovated units in the same condition, or do some require more work than others?

Maybe they’ve only missed 2-3 mortgage payments? 

Lenders will qualify you based on the rents covering the 1st and 2nd mortgage payment.

When I buy a property  how much can I deduct in average from that purchase for that year or what thing related to that purchase can be deducted.. ( example: the down payment?)

I'd look at doing development deals as well. you can do joint venture, non recourse debt above 5 million in construction. we do deals in Columbus Ohio and miami florida if it is of any interest. columbus cost per door is much lower than in miami and we focus on micro units under 600 sq ft mostly for development to get higher density, higher lease prices per square foot, etc. there is a "affordable" housing deal that has 336 sq ft studios in columbus that gets about $995 in rent which is above $3. the normal single family rental gets in the $1.6 or so range even new construction 

Now a non licensed investor ( What you guys are calling a wholesaler is equivalent- to calling a barber a Fade  or a plumber a  pipe, cannot directly represent For Another but rather for themselves.