Here's how the IRS defines it:If you own or live in more than one home, then you must apply a "facts and circumstances" test to determine which property is your main home.

Is there anything else I should do to prepare myself for 10/01 to come and I have no rent, no new lease signed and she still lives there?

Soil is in restricted soil area (perc test will be available in Feb in our area).Keeping in mind this is a 1/2 acre plot with 1/4 acre plot across the street, 5-6 outbuildings (chicken coop, outhouse, garage, ~100 sq ft shed w/ electric, cinderblock smokehouse, fire pit, and other shed).

If the deal makes sense, the money will come, but you make your money when you buy.The market here is very competitive for a number of reasons, so you have to be prepared for that.

You may need to hire a building designer or architect to help you prepare the necessary documents for permitting.

Do a pressure test on the water and sewage lines, see if there are issues. 

Assembly is pretty straightforward, It took me longer to prepare/level the base than to assemble the shed.

As an owner of 6 STR properties I will occasionally test it out and put in one of my addresses in Airdna, and they are never correct.

He wasn't real keen on the idea of giving up 25% of this rents to pay us.Like we do everyone, I offered him a 6 month test drive for no fees whatsoever. 

Do a test demo4.