Would they have to go with a non warrantable product or is there some sort of rule that allows it be a new condo building and waive some of the underwriting requirements?

How valuable would this be for potential renters?

For example, multiple bids on jobs with contractors until you build a trustworthy relationship with someone.

I've build a lot of equity in one of my properties and I am thinking about recasting to lower my monthly payment. 

Any ideas on how much it would cost to build out the ADU?

And switching back and forth will cause you to lose many years of tax deferred gains.But you're starting out and trying to get traction to build. 

Getting started is as always the hardest part - building out the logistics, legal bits (for import duties, etc), marketing (be it a website, direct b2b marketing or Amazon) and sourcing the right suppliers are all equally difficult (yet interesting) tasks.

I’m wondering if anyone has advice on how to get started or if I should wait and keep the money in the stock market and diversify to other  investments to build up more cash.

Go into your building department and verify as well.

There is a small chance I keep this one and continue to build the portfolio.