Another important point to bear in mind is the currency fluctuations.

This is one of the largest foreign country's investments on US soil at $17 billion dollars.  

The city is rationally protecting its citizens, most of whom bear the costs of legalizing short term rentals, over the interests of the landlords, AirBNB-type companies and tourists.I think AirBNB makes more sense in vacation communities or areas that don't have a problem with sky-high rents. 

Slabs have no weight bearing purpose.  

I just finsihed a scope of work for a single family flip that involves rough plubming, rough electrical, minor duct work, a small section of load bearing wall removal, and a conversion of a haff bath to a full (along with a bunch of cosmetic work).

Each year I  have holes in walls that need repair, screen doors broken, missing screens, dirty walls and heavily soiled carpet as examples. 

Instead, we recommend properly and securely installing a good quality curtain track, with "wand" pulls (NO rope system), and ball bearing hanger guides.

And the terms of the business bank account are favorable (ie, low fees, interest bearing, integrates w Quick books)?

My plan is to put in a new kitchen, add a laundry room, add a shower to a half bathroom, and rearrange the bedrooms (this will require knocking down non-load bearing walls and putting up additional drywall).Wondering if anyone has insight into the building permit process.

With $20k+ worth of furnishings in your STR this is something you should bear in mind.