I would expect to set aside AT LEAST 15% (personally I would probably be closer to 20%) for repairs, capex, and vacancy, assuming you are updating the major components in both units. 

How does one go about finding private money with an equity share component?  

It includes a construction cost component that you probably understand, and much else that you might not be used to, including ARV determination.

Monitor for leaks and anticipate future upgrade.Central Heating and CoolingCondensate Components Components: Gravity Drain Line, Condensate Pump, Secondary Drain Line . 

It’s important to use a lease agreement that thoroughly addresses all key components, making it easier to enforce if necessary.While there are many templates available online, I strongly recommend having an attorney either draft or review your lease agreement.

For any machine that was produced in our US factory and the components needed to assemble the decision was to either fully automate the process to 24/7 production here in the US - or offshore to MX or CHN, the difference being the response time to change orders (6 months vs 6 weeks) due to geographic distance.

That's the key component that is usually missing when I hear other entrepreneurs/investors say they don't like QBO.Something else to keep in mind is your entity structure and how your entities file tax returns.

That's the key component that is usually missing when I hear other entrepreneurs/investors say they don't like QBO.If you want to discuss any of this further, I'm happy to answer questions and help walk you through it.Best of luck!

He is handy and would handle most maintenance.What I can't figure out is: 1) how to set up the seller financing w/ the rent component. 2) whether to purchase as investment property or as second home and 3) deal directly with my father thru an real estate attorney and 4) considering his age, whether to set up a balloon payment a few years down the road for his benefit.

It also may make sense for your brother to have his own LLC for the construction component of the flips, in which case, the LLC for flipping can engage his LLC for performing the renovations.