We ask them the basic questions about their income on the phone and if they say they have the deposit, rent and 3 months of bank statements and rent receipts then we will make an appointment to show them the rental unit.We manage about 140 rental units at different locations and we do not do credit or background checks.

As far as deposits go, let's say about 50-90k was recorded deposit on the last 6 months.

Would the three other roommates (not renewing) have to give consent (in form of writing) for the Landlord to use the original security deposit for this "transfer lease"? 

Now we are asking them to deposit remaining rehab money against principal.

The purpose of the Refi is to get you ALL your Deposit back (for the "Repeat")!

Imagine our surprise when a former tenant who owes about $1200 in damages beyond what her security deposit covered contacted us asking about setting up a payment plan to repay!

Maybe they can send you the check and you can do a mobile deposit from your cell?

The next week, I see that somebody had, in fact, deposited the check that I originally sent over a month ago, the first day possible after I made the transfer via PayPal.

Is an escrow deposit needed in purchase and sale contract for wholesaling?

As for your other questions, I know that the large majority of AirBnB properties include a mandatory cleaning fee, and I would imagine that you would treat pets as you would in a SFH rental (additional deposit, etc.).