There are also additional costs of operating and maintaining an LLC, like separate bank accounts, annual report filings, tax filings, etc.2.

A small multi unit in a decent part of town that produces good cash flow.

Get into the routine of entering them as soon as bills come in or putting the bills in one location, entering them once a month and writing on them that they were entered/paid, then filing them. 

That is for, if necessary for us to sell our existing home and move to the number one produced, which will be the first "model home".

A primary home is not an investment, as it's not producing you any return other than appreciation which you have access to only selling or taking out loan.

Like many (most) businesses it requires an investment of capital; money expenditure for ongoing marketing; management of operating, marketing and professional personnel; keeping accounting records and filing tax returns; established sales practices; constant monitoring of goals, budgets, and productivity; establishment and implementation of operational systems; and providing customer service.  

I think if it's vacant 30 days, then a homeowners or landlord policy will deny any claim filed.

(a) Any person offering to redeem must pay to the then holder of the legal title the value of all permanent improvements made on the land since the sale, and if the holder of the legal title cannot be ascertained, payment may be made to the circuit court of the county having jurisdiction of the subject matter when the complaint is filed to redeem.

I wonder if the tax forms would be mailed there, and then that trust company will file to IRS to explain it is tax exempt? 

Since then, she has sent the keys as agreed but hasn't produced the payment as she promised.