Start by talking to a bank/loan officer to see how much you can borrow. 

There would have been a "run on the bank" a long time ago if they did.

I would suggest either talking with a local bank/credit union about refinancing your existing portfolio and/or one that shows they do MHP loans on their website.

I may be misunderstanding your question.In an "assumption" (it's an actual banking term with a definition) the bank takes you though the same hoops as if it's a new loan.

The lender only put up $25k to purchase the house from the bank.

Not easy to do with bank financing.

Many banks wont touch deals that are sub 90% occupancy, so you could negotiate short term seller financing to help give you runway to make the building bankable for a refinance while you reposition it.

Or are you actually talking to a bank about buying the note so you can see the notes and credit on the owner of the property?

The truth is, over the last few years, many of these people are barely cashflowing at all and the default rate with the banks on this product is skyrocketing.

The moment the first payout hits your bank account, all that goes away.