I will be referencing this in the future as I continue to invest.

Most of the deals I've done, and likely the ones I'll will do in the future, have been funded by HNW investors, by choice. 

Just getting a head start on if it comes down to a future trial and then bringing in the lender as well and just interested in what other possible charges the lender or borrower could face that I want to begin researching but also to bring that up now to put more pressure on the parties.

This is also gonna depend on how strong the buyer is financially if its even possible for them to pay the difference.If you get multiple offers on a sale in the future and the price goes over asking, make sure the offer includes some type of language waiving a portion or all of the appraisal gap.If you tried to fight the appraisal already and didn't get anywhere, you don't really have much recourse.

The PO Box mainly won't get used but in future I plan to use the address with any tenents.

@Ham Merritt Well this idea is something I am considering for a future investment.  

Additionally, for each existing and future Illinois investment property, I intend to:- Deed each property into separate Land Trusts.- Establish an Illinois LLC that will be taxed and will own the interests in the Land Trusts for my Illinois properties.- Set up a new management entity taxed as a C corporation, which can be fully owned by my revocable living trust.

Going forward, what is the best way to structure the partnership so we can 1031 exchange in the future?

This also allows you to be involved and gain experience for the future. 

We'll ensure your access is promptly removed, and we genuinely wish you success in your future endeavors.