The key is to offer something different to the other homes, and be an attentive host, to get good reviews to boost OTA (Airbnb/vrbo) rankings. 

It’s time-intensive, so working with experienced teams can make the process smoother. 

Downtown Charleston experienced a significant surge, with home prices increasing by 33.2% compared to the previous year, resulting in a median price of $1.2 million.

It has to be an addition.I would double check because maybe the workaround is reinforcing the garage and building above it.We lived in our studio ADU for two years before we moved into the main house.Best thing to do is talk to an experienced lender.

Many areas have experienced a moderate slowdown last year, and are temporarily (my opinion) stable, and seem poised to soften from the high prices we have seen in the past couple of years. 

We have a team of experienced agents ready to find you your next great property!

Thanks as always.RL What you were experiencing is actually more common than people want to admit.

You can also search Google and read reviews.

Experienced developers, could you tell me how the process/financing works?

Instead of debates and personal opinion, look for proof https://www.ladbs.org/docs/default-source/forms/plan-check-2017/single-family-dwelling-duplex-plan-review-list.pdf under G (Interior Env) which defines the minimum requirement of a habitable room (aka bedroom or bathroom).