Are there any legal paperwork steps to take to avoid a bad outcome?

If they are professional probably Dallas FT.

I am a wholesaler in Miami area,   if you are planing to do the same you need to have the right to sale it, I will use a legal approved contract,  you can ask a Realtor to help you with the offer, ask for 0 days for inspection, better with business days,  on that period you will have the time to sale it

Is there any way I can make this work legally.

or is there some legal way to find out why it was abandoned?

If you don't hire a professional and you decide to sell you may regret it when you have trouble selling.  

Bigger Pockets Family,    I was wondering if this is legal: Can I ask a tenant to move out early if I am going to move into unit she is leaving anyway?

I'm assuming that person A had no legal authority to "sell" to person B without paying off the mortgage so in my mind that should make the Deed for the Quitclaim null and void.My questions are:1.

You generally try to get enough of a fee to cover so many expected months down time to get a new tenant until open and paying rent, expected leasing commissions needed, and attorney legal fees negotiating a new tenant lease, along with the attorney fees for negotiating the termination, as well as tenant improvements.So you might go for it 400,000 left on primary term 100,000 or something like that.

Seek legal counsel or the right answer.There is no quick fix for dealing with a flooded house.