Estate is guaranteed a sale price no less than the agreed upon “as is” value.I fund the entire rehab.If all goes well then we divide the increased sale price at closing in some manner specified in the agreement.

I want to sub-divide the lots to their original dimensions.

If the overall take-home would be small, what's the draw?

Hire a licensed structural engineer and he will provide a detailed drawing showing all the elevations for the house.

The cash buyer needs to have the contractor do some drawing of the new addition and send footage then submit them to the building department.

I sold property with owner financing and I had an attorney draw up the docs. 

If I'm understanding correctly, you can factor out Lmax and divide such that: Lmax = Pmax / [(ac1(1+c1)^n1)) / ((1+c1)^n1)-1) + (bc2(1+c2)^n2) / ((1+c2)^n2)-1)] and MAO =  Pmax / {(a+b)*[(ac1(1+c1)^n1)) / ((1+c1)^n1)-1) + (bc2(1+c2)^n2) / ((1+c2)^n2)-1)] }Will build this out in excel later and let you know if it works...

You find the Rent-to-Value Ratio by taking the monthly rent dividing by the purchase price.

Now that it's under contract, we get our home inspector to go in immediately (Giving him warning that you may have a home needing inspection before hand is great) as well as getting our contractor to walk the property and draw up a SOW. 

Includes obviously dividing the profit between the partners) or independent investments mainly (build my credit and try to make it so most of my properties are mine and mine only)?