All of those questions are answered in David Greene's book "BRRRR: Buy, Rehab, Rent, Refinance, Repeat" To answer all of them here would be redundant, not helpful, inadequate and unorganized. 

If the existing 'main' MLS in an area wants to get most or all of the local listings, they need to step up, be the most modern, up to date, easiest to use, add value, etc, and not be the clunky 1990s-feeling websites/portals that they currently are.

Would those sales comps be only MF homes or all homes?

Ready to pull out most or all of our cash invested w/cashback refi.What made you interested in investing in this type of deal?

"§ 214 (H) THE LANDLORD SEEKS IN GOOD FAITH TO RECOVER POSSESSION OF ANY OR ALL HOUSING ACCOMMODATIONS LOCATED IN A BUILDING WITH LESS THAN FIVE UNITS TO PERSONALLY OCCUPY SUCH HOUSING ACCOMMODATIONS AS HIS OR HER PRINCIPAL RESIDENCE." 

Or all of the above? 

*  What requirements and contingencies (i.e. umbrella and earthquake insurance policies; ex to forfeit some or all of her share of equity to make me whole, etc.) would you include for protection against possible forms of loss (i.e. lawsuits, natural disasters, mortgage default, property neglect/deterioration, etc.?

Some will give you back some or all of the DP; most will not.

Some (or all) may need to be carried over to 2021 once it's actually producing income.

Part of the process of the BRRRR strategy is the refi portion to get you back some or all of your initial cash invested so you can keep going but not all properties will be in a position to get the refi so that is something you need to consider with your lenders and you should have an alternative for that instance.