I've never seen a new STR law that didn't grandfather in existing permitted short-term rentals.

Quote from @Sami Gren: I start by making the original tenant fill out a form requesting to add a new renter, and they pay me a $50 processing fee (I charge a $50 fee any time I make changes to an existing lease). 

And, the breakup fee is a non-starter.

We approached the existing lender for a loan assumption.

You can often get better rates with a national lender, but the customer service is non-existent, communication probably sucks, they may ask for the same documents multiple times, etc.

You can also seek projects through licensed Portals that are using Title III and can accept money from non-accredited investors. 

Are you/your partner(s) foreign nationals or non-permanent resident aliens?

Non-passive to achieve this level of return.Add the addition of the ADU makes the main unit rent controlled if over 15 years old.the work to add an ADU likely exceeds the effort of a brrrr that can achieve infinite return  Experienced investors are adding multiple ADUs by leveraging items like bonus density, committing units to affordable housing, etc.  

I’ve read quite a few posts about foreign investor financing but most seem to deal with non-citizen investors without US credit or personal tax filings.

Hey Zach,I work with a lot of non US citizens on the investment side.