Model help for "unique" situation

[Jeff Wilkerson]

Hi BP! First post and looking forward to more. Anyway, my Uncle is retiring and basically offered me a chance to partner up with him in an effort to make some money/create equity to buy a personal home in the Bay Area. The catch is that I would have to do the legwork. Once you understand the deal, you'll get it. Deal as it stands right this second: - My uncle will front most of the down payment on the investment property. - I have to contribute 5-15% of the DP - per his "demands," I need to create a model that shows a refi in X years where his money can be pulled out and my wife and I assume the investment in its entirety. The model also has to show our new CF, CoC, etc. after the refi. Where do I even start? Thanks!