Allow things to play out, unless the buyer closes sooner.

Dalton,A multi LTR strategy sounds like a great play for 2025.i would suggest attending any and all REI meet ups in your area that you can find; my brokerage hosts a bunch of them up in the north east and it's been huge for our growth.i would also suggest finding an investor focused agent.

The sooner you regain control, prove that you fully intend to enforce the terms of your lease, and that you will not be 'played' by their recall of events or documents, the more effective this action will be.  

You just have to do a LOT of homework and play by the rules.

Mentioning unique perks like 'Game Room,' 'Lake View,' or 'Pet-Friendly' can really draw people in.

That can play a big part when issuing terms. 

Your tenants obligation was to pay you on Jan 1, so it doesn't matter if they paid someone else they still owe you...obviously details re: notice and dates all come into play here and from a practical perspective I'd work with the tenant and not move to evict over this.

One thing to remember is the flipper will have $30k- $40k in financing during flip and closing costs to buy the home then another $25k when they selll so that will play into the numbers that need to be considered. 

I very much have a long term play and "don't care" about the cash flow immediately, but obviously I don't want them to negative. 

If your game plan is to pay it off with prepaying all your money you absolutely need a HELOC however don't need to use.