An algorithm doesn't have the correct inputs to make a decent valuation. 

If you did this and either held it for a year (I️ believe that is the standard, but I️ would confirm with the banking institutions you want to go with), you could then refinance, pay off your land contract and pull cash out if appraisal came back higher.Your original thought process is correct in that a bank wants the 20% (I’ve seen closer to 25-30% on commercial loans until you build relationship) to protect themselves from fluctuations in value, but they also want skin in the game.Good luck,Roger

What's the correct way to do this? 

Investing is not a way to get out of debt it is a method used to make your money earn it's keep.

If I'm reading you right, you have a fully executed contract in which the seller agrees to pay for certain expenses / repairs, and is now refusing to pay for them.I'm also presuming that the $20K reduction was within the contractually allowed due diligence period and was agreed to by the seller within that same period.If that's correct, the seller is in breach of contract.Your attorney should contact the seller and give them the option of performing to the contract or being sued for "specific performance".  

See how nice and helpful people can be when the situation is correctly stated :) @John Andruszka   SO Ya your next step is post pay or quit then file for non-payment, eviction, she's not gonna pay you a dime. is my bet and I bet I'd win that bet..You have no guarantee she'll pay rent, you've given her 2+ extra weeks to move..

Numbers correct *buy

I can also send you a blank statement that has the correct wording and font size of the legal blurb at the top of the form if you can't find it online. 

Most commercial brokers don't have any deal flow and really don't understand how to correctly value a mobile home park.

Correct most HOA's have a 30 day minimum to rent in Arizona (and most states).