I feel like you have more room to hold them accountable to a certain level of work and have clearer boundaries. 

My plan has always been to live in the upper unit if I end up purchasing one with this floor-plan.

You're analysis is right from a very high level, but there are many lower level costs that you're not considering, that Bart illustrated.

We were discussing rehabbing our first level and decided to get a line of credit in order to pay for the rehab.

In general though, from a sheer high-level observation, I have been noticing all the real estate apps on my phone notify me of "Price Drops" more often than in the past. 

He will pay back in 5 years after the rehab and upper occu. but I won't have any upside on the apt if it sold.   

I use the following method:Pull compsGet potential rent numbersGet a scope of work (costs & to-do's)Ask yourself what a realistic ARV is.Ask yourself what level of rehab it will take to reach ARV target. 

My brother gave me an idea to find a fixer-upper since I am handy and can do mostly everything myself.

Some questions though about the sale based on the bid process document that I received from my agentProperty Background: The property is fixer upper and is currently not livable (because kitchen is not functional) so I cannot get a conventional loan so planning to make an all cash offer.

We’re going to keep some of the ccs open just to keep our credit rating at the high level it is now, but not use them (except the occasional putting a large purchase on one to get miles and then immediately paying it off).If those are the family memories that meant the most to you - that’s awesome!!!