I use HELOCs or savings etc so the bank where I have these accounts is the same as my checking account for the HOLDING LLC. 

This will be dependent on the bank.

Hana,Great question and the good news for you is you paid for the appraisal so it belongs to you and it can be used at another bank.

Refinanced in December of 2022 into a 1 year bridge loan of $222,400 (80% LTV) after failing to sell the property once interest rates changed.

Hedge funds know banks can now custody.

It syncs with my bank and CC of course.  

If you want to figure out the value logically, you can create a spreadsheet that will show your cost of financing and principle paydown on an annual basis to figure out the break-even date between the seller-financing price vs paying market price, but with bank financing.You mentioned a 40-year term, but is there a balloon?

The biggest challenge I can see for this is that I hear it's a pain in the *** for the seller to go through a local community bank and confirm their income for their approval for a mortgage, and there are local/community banks that will approve 95-100% LTV loans based on how profitable the deal is.

It's not negotiable.Most brokerages have failed their agents in preparing for this.

And the fact the new owner of the neighboring property also failed to do due diligence should not factor into your decision to keep, if still allowed by your state laws, what you presumably paid for.