The closer to the highway, the better. 

If you are trying to use the "Delayed Financing" exception a couple of things you should keep in mind, #1 you must have paid all cash for the property (no borrowed funds for purchase) and no liens on the property #2 you can use the maximum LTV allowed for purchase of property (ie. for an owner occupied property 97/95% LTV or non-owner occupied max is usually 80-85% LTV) #3 must refi within 6 months of purchasing the property (so for the most part you are going to use the purchase price plus improvements rather than the new appraised value) #4 property will have to qualify condition wise within the lenders guidelines, so no major work should be outstanding like broken windows, holes in the roof, ect. 

You can bring the account current by paying off the outstanding balance.If you're looking to do a cash-out refinance in order to pay off your siblings, I'd connect with your attorney and a local lender to ask how you can facilitate this. 

It is across the highway from a closed Amazon.com distribution facility. 

Wouldn't tell you how much has been paid against it, but at least you'd have an idea of how much is the max that could be outstanding. 

The cash flow is outstanding much better than a SFR or duplex.

The statutes outlining the tax deed process talk about how it wipes out prior liens (with exceptions like IRS, etc) and the state transfers it's claim to the property "excluding easements, highways, and rights-of-way owned by the county, unless expressly conveyed". 

Typically 1% of the outstanding loan balance, some borrower will negotiate it down to .5% for the first assumption.

If I *can* do this, how would any outstanding loans I've taken to purchase and improve the property get split and partially paid back to my lender?

Is it near a highway?