In terms of maximizing your returns you want to compare the interest to an alternative.

How do the interest rates usually compare between the two?

If you compare ADU addition with any larger development effort , either in size of unit or number of units, the return is greater because building single small unit is the most expensive residential development.  

Given that your property has been subdivided into two rental units, it should indeed be compared to other multifamily properties in the area, not single-family homes.

Compared to how to do bizz out here in the West were if they are wholesale deals and I dont need title insurance I just do my own deeds and record them..

Inventory has held steady at around 5-6 months for some time now, with roughly 4% more active listings on the market in the metro now compared to November last year.

This is what is pushing up rental demand for small MF properties that having lower rents, fees, or total move in costs compared to other larger commercial apartment complexes.

Start by thoroughly evaluating leads for profitability, calculating ARV (After Repair Value) based on comparable properties sold in the area within the past six months.

Look at the age compared to there useful life and cost to replace.

There was a BP member who was quite active for a short duration that presented hi use case for RE not being a good investment compared to other investments especially ially stocks.