It is my understanding that this is correct and accurate, please correct me if I'm wrong.The second issue is separate.

There is also separate entrances to each floor.What things do I need to worry about if I would like to rent to 2 separate families?

I have had too many friends who were absolutely getting married, no chance of separating, it's going to happen, you can take that to the bank, it's offensive that you would even suggest such a thing! 

Do I need that as a separate line item?

-Do I need a separate business account for tax reasons?

I am looking at purchasing a SFH and renting out a MIL with a separate entrance in salt lake / utah county.

I have found deals where I have put down, $30K, 40K and 60K for down payments on separate 4 plexs with owner carries, BUT, they all needed rehab work to get the rents to double.

(And I understand the prohibitions against self-dealing and having family members, etc. involved.)I sent you a separate message to follow up individually.

A deal popped up on the market and we are exploring all the ways to fund it. 3 separate units.

If you had built a separate ADU and not converted the garage, you may have been able to use the garage for the JADU.3 & 4) "multiple accessory dwelling units within the portions of an existing multifamily dwelling structure provided those units meet certain requirements; or (4) not more than two accessory dwelling units that are located on a lot that has an existing multifamily dwelling, but are detached from that multifamily dwelling and are subject to certain height and rear yard and side setback requirements."