That will allow you several benefits like adding the square footage to your property, having it appreciate in value as more ADUs are added to the neighborhood, legally rent it out within the city's parameters around long-term, mid-term, and short-term guidelines, and feel good about your investment.

IDEALLY, we would like to find a property that has or is capable of being converted into a “mother in law”, “ADU”, “Casita”, or any other separate living quarters in which we could rent out the main portion to a tenant (short term or long term) and then use the separate space as our own for when we come and go with business.

We also have some mobile home parks that we are selling and we have some luxury short term rentals.

I'm not a fan of buying a short term liability (no cash flowing property) in hopes of long term gain through appreciation. 

We are purchasing and rehabbing a short term rental, but need to decide whether to put  in our names or in an LLC?

Other than that not too much you can do, the only alternative post-closing would be to offer cash for keys for someone to move out quicker, but if it's short notice to vacate period like 15-30 days than it's probably cheaper to wait. 

I’ve found success by focusing on emerging neighborhoods, avoiding flood-prone areas, and exploring short- or mid-term rentals to tap into the steady stream of tourists and business travelers.Good luck!

Some will do short term loans that allow us to buy, rehab then refi.

IMHOThere are more international students staying, I've seen it where I work (at a university), but many of the newcomers are not students and a country our size can't handle that many people in a relatively short period of time. 

You will find people who make money in REI through many different strategies: buy and hold, flipping, BRRR, house hacking, short term rentals, rental arbitrage, etc.