Will they give you credit for the "APPRAISED" appreciated value as your portion for the collateral or will they require you to kick in say 25% cash for the $5.5mm. 

A lender should look at the collateral your capability to repay the loan and your credit worthiness.

And if you need to cross-collateralize it with the new building as well, you could.

If there are truly are no comps even when they look wider and farther back in time, then the 'party line' answer is that there's no evidence of any demand for this type of product in the market, making it bad collateral for a secured loan. 

Is anyone lending money to home owners that are about to lose their home to tax foreclosure and using the property as collateral should they not pay it back?  

If you do one you shouldn't have a problem as now you can use property as cross-collateralization.

Recovered cash plus profit is used in the next deal.Rinse and repeat.      4 - Using non-collateralized loans, where some of the cash from the loan is used as a DP on an investment where the return from that investment (cash flow) pays the debt service on both the investment and the original Loan. 

In our real estate investing, we do not plan to use our home as collateral for any loans.When we were younger (in a previous house), we paid ahead on our mortgage too aggressively, and at one point found that we were way too "cash poor".  

They may want to use your investment property or a car as collateral but it shouldn't be that difficult to come up with the money. 

The original Note was lost, but the Collateral File includes an Affidavit for the lost note that seems to create a complete the history.