We know this because starts are in the 240,000 unit range, and construction is a pipeline that takes time.

Most are single families in the $1.5-$2M range, so we new that a duplex would be would have a much higher ARV than other duplexes in the area.

I actually tried Cherif Medawar's program and have found Licensing Experts vastly superior in a couple of ways. 

I have a 2BR on the front range in CO and half of the time it is just parents and few kids. 

And everyone's situation is vastly different when it comes to taking care of elderly parents..

Byrna    it has an effective range of 60'  Have any experience with one of these?

For lower value flips, 200 - 300k, we stick to that range as the projected profits doesn’t have much room for an inevitable rehab oh-$hit.

Each jurisdiction is slightly different but from past experience if your looking for a NEW detached ADU its going to be in the $4,000 - $6,000 range (depends on SF & components) but if it's an addition to an existing occupied building then it will be much less.

The vast majority of what you need to know about real estate can be learned right here on Bigger Pockets like you are already doing.

I would do some market research on top-growing cities and determine which of those cities are within your price range and cashflow goals.