Are the other parties to the agreement the property owner sharing the well and maybe an HOA?

IRA funds can be used to make investments only; they can't be used to buy a residence.

I am new to the real estate world.

When you work a 9-5 job, you typically rely on colleagues assigned to you.As an investor, you have the OPPORTUNITY to assemble your dream team of professionals who share your ambition and can help you achieve your financial goals.

I lay out the offer terms I am comfortable with right up front.

The appraiser will ask for permits for the work done, and if there is non to be provided he/she will not give the value and in turn you will not be able to get the full amount of money out of the home you were hoping to get.  

I own property and have no children or real persons that I want to inherit my property after death. 

Not a straight up no, but not a straight up yes. 

I've heard 10%-20% is the average net gain but I just want to be more clear about it. 

Currently, East English Village home prices are up, and the neighborhood committee is committed to building up the area.