Michael, one thing to keep in mind is that while very inexpensive houses can look like cash flow kings on paper, the reality is that they are inexpensive for a reason.

Obviously you need to track payments on your side and a simple spreadsheet can accomplish that if you need a simple inexpensive solution.

Hard Money Lender: Your family member could charge you points up front to borrow the money with a fixed time frame to pay back, example six months, but the HML is amortized for one year.

But what i think a park is worth and what others think its worth is different and can be based on your expertise, investment criteria, type of cash you have, and if that cash has a timeframe/deadline.   

Actual Terms of the existing loanActual RE TaxesActual Insurance Costs...so forth and so onI would venture a guess, that it would be challenging to find a rental that could produce this return, in the same time frame. 

I always thought that it was a lot more inexpensive because it was used. 

Can I set time frame(s) during which the money is received (100K a year, for example) by having a exchange accomodator hold the money,etc. 

The bank might have an issue with the buyer negotiating for the seller because of this.In addition, most lenders require that the property be listed in MLS for 7 business days (this timeframe can vary) before an offer will be considered.

I am more interested to know the operational and legal ramifications of this set up though if this model is successful to improve the cash-flow and the value of the building in min 5-year time frame.  

Take any time frame.