We are starting the process of dissolving our investment business (LLC) that has two partners.

I know that's what you started this thread for. 

Once you convert the former investment property to your primary residence you will then start to convert a proration of the gain from tax-deferred to tax free (according to the number of years it was rented/lived in). 

I started my LLC in the summer and still working through some kinks getting website started for marketing.

I would suggest a good PM to start if you don't have a solid background in hospitality or at least something in the service industry.Self-managing can save a ton of money if you know what you are doing. 

I'm actually going to start with a turnkey property.

I am a newbie in BP, just started listening all the podcasts, fascinated by the community!

Therefore start with the min. requirement your lender will accept and see if that matches up with what your partner is willing to accept.

Due to item 1, adding an ADU can require years to start achieving any return (once the accumulated cash flow recovers the initial negative position).4) Adding an ADU is a slow process.

I was watching a Youtube video by Rob Abasolo that you may like to consider called "How I'd make $10,000/month on Airbnb if I lost everything and had to start over".