You can start by picking random Zillow sales or currently listed properties - then, use the rent estimator and rental property calculators/tools to determine what the returns would be on that particular deal.All the best!

<3I have a bunch of random thoughts, questions, & scatterbrained ideas regarding building an ADU that I'd love some guidance/feedback on if anyone is willing or has knowledge/expertise on! 

Do not just get randoms, this is going to take a lot of work to protect your privacy and personal residence.

@Corby Goadei obviously agree with everything you said... but I assume these folks are just trying to look out for OP.and it seems like there are a lot of people that come on BP because they read Rich Dad Poor Dad, or watched a Brandon Turner webinar, and then spend a bunch of money on a random property, get crushed by capex, and disappear.i think the points / 'objections' raised are valid. 

Hey Sarah, if you're going to give up THAT easily, when random strangers on the interwebs just have to quote a few stats and numbers at you to make you fold up your tent and wander off into the night...well, the first thing you need to work on is telling anyone who doubts your resolve to go eat their dinner out of a dumpster.

Hey Sunny, Random HI Mortgage Broker here, Here is my two cents:1) 1.5 bps a day is actually a very cheap lock extension price.

A few thoughts from a random Mortgage Broker in Hawaii...1) Your friend likely isn't a mortgage broker as there is a pretty big delta (1 pt)  between what your friend is quoting you and what I am seeing in pricing .

Just ask people randomly.

I'm with @Jonathan Greene - no, don't buy 5 properties in that price range in a random market. 

I don’t have kids, but I grew up at least in retrospect pretty well off as did both my parents, I am one of the least entitled people I know as are both my parents, that’s attributable to a few things imo, one is just pure personality, I know some people that grew up dirt poor and are extremely entitled and other people that are crazy rich and you’d never know, some of that is just random luck, but I think another key is while we’ve always have had the security that comes with being pretty well off, we’ve going back generations lived below your means, my mom grew up in westchester county New York which is a crazy rich place, my grandmother intentionally moved my mom to a frankly pretty mixed income school district so she didn’t become spoiled, I grew up until I was 13 in a very middle class neighborhood, went to middle class schools, hell my mom up until literally this week drove a 13 year old ford explorer with 155k miles.