Add 900 sf for an increased value of 100 k?

Last time I did an eviction in Jefferson County, I was going through the paperwork and remember seeing that the notice period increased in length with the amount of time the tenant had been in place, while the paperwork for Adams County did not have that same specification.  

We'd like to set a certain standard for our rehabs.

Every time you make a mortgage payment, the equity paydown you get increases each month.

It is the standard in my community2.

If a home sells or increases in market values.

I am not a lawyer, but in section 17.A 9 of the standard texas lease."

Is there a standard template you use for private money loans?

I've put a fair amount into deciding what I want to purchase over the last couple of years and have just recently gotten myself into a position to pull the trigger so by normal standards the offer would be insane, but feeling so aside the numbers have to make since. 

@Ivan Barratt - what is your plan to increase the cash-on-cash returns?