Any suggestions as to what should be added would be much appreciated.

I've also never had someone ask to voluntarily be added to a note without refinancing.

I have to discount my properties on AirBnb just to pick up a few rentals.If you are running a bead and breakfast or renting a room then Airbnb may be better for you.Having multiple platforms will boost your revenues.

I am going to be adding an addendum to the current contract that stipulates owner financing in the event bank/lender financing falls through and am trying to figure out what to put in the contract. 

She may want to retain the power to ask him to leave which will be given up if he is added to the lease.As a general rule I don't see any issues if they understand someone cannot just be added and removed without all parties agreeing. 

Home depot now has FRP "bead board".

You could be adding a 300k house every year to your portfolio, or you could jump your investing to WI and pick up 5/yr.

The 3.5% margin will be added to the index (5-yr treasury rate in this case) to determine your loan rate for each adjustable period.  

It appears the assessments will be added to the tax bill starting in 2018.

That sounds great, I've messaged him to be added to the email reminder list.