They then injected foam to fill gaps and further raise the foundation a total of 5 inches while adding more pressure to the helical piers.

The mortgage paydown and appreciation is an added bonus but I dont count on it, because even though its raising my net worth, I can use it to buy groceries. 

I am looking for 100,000$ for my portion of the investment. this is my next step in real estate (raising capital) because i have used all my money in my current portfolio.I have an investor that wants to invest and I have have briefly explained the opportunity over the phone.I have also spoke with a lawyer about how to do this.

I've not heard of any cost effective roof raising.

If audited, you have to prove that the payment did happen. 1099s is a separate issue which the IRS might raise in a audit but usually does not.

Apple is building their billion dollar campus up there, and tech jobs raise rents.

Your cash flow will increase steadily if you raise rents properly.

A syndicate might be raising $8 million to buy a $20 million property, they aren’t typically buying unlevered.

The tenant will want to do that because they always think you are going to raise the rent immediately.

@Joe Lujan You could raise the late payment fee to say $100 to either encourage him to pay it on time or help make it worth for you