If you really want to get to cash flow much sooner, start learning to do things yourself. 

Compare that to low cap expenses of a new build and any higher rent rate associated with the new build as well as any anticipated higher appreciation and run your numbers over a 5-10 year period.New construction may cost more upfront but may make more sense with an extended timeline.

Unfortunately, I don't have the luxury of waiting out the 90 days since the seller needs the cash soon and I need the deal.

So the friend contributing the least upfront would own the least stake at first and would gradually buy more into it as they paid the most monthly to build up equity into the project.

A credit card cash advance is not taxable.Trading credits are taxable no matter where you keep them. 

We could maximize our capital (~$150,000), but lose any future cash flow with the property.3- look into a 1031 exchange for a multifamily or small apartment complex.

It's easy to furnish a MTR with little to no cash out of pocket if you can qualify for zero percent financing credit cards.

You are right, the interest is at 8.5%, but with SDIRA all cash flow goes right back in to IRA.

We will eventually split the cash flow.

It isn't true that all properties cash flow.We have a formula and have developed a program that helps us decide.