Also have the conducive conditions been addressed if they can be...like no foliage touching the house, high soil removed, etc.

The limitation is the ability of the soil to accept fluids in the leachfield downstream of the septic tank. 

From what I saw the recommendation is to set up an two-person LLC with another person having a minimal share for the QOF (taxed as a corporation), and then set up a QZOB underneath it in the same way and hold the property under that.

I am doing a live in flip for a house and looking at the floors underneath the old green shag carpet I pulled up in the living room ..   

Luckily nothing was broken, but I am having to replace a lot of linens, etc. because they are soiled.

It all depends on the location, topography, soils conditions, requirements etc. $10k-$30k and up is typical.

You'll need a soil report and a land survey. 

Paid to have a long term killing agent drilled into the slab and soil.

A tile guy can tile your shower, inadvertently cut a hole in your pan liner and due to leaky pan liner ruin the drywall below the shower area - cost to tear out and retile the shower pan area, repair the drywall underneath and paint the entire kitchen ceiling $3,500.Trim guys installing base, shoots a nail and hits a wire (or a water line). 

Has there been any soil testing done on the land?