Determining rental rates for ADU's/JDU's

[John Jones]

Anybody know of any good tools or websites to yield the kind of analysis the Bigger Pockets Rental Property tool provides however for ADU's and JDU's? I tried to use Rent.com and other rental website to filter by ADU but they haven't adapted/upgraded yet to this capability.

We are looking for prospective property that has existing single fam res on large enough lot to build an ADU and convert the garage to a JDU and of course I need to know not only the costs but the projected rental rev.

thx