We invest here for the cash-on-cash return which for the vast majority of our properties is infinite since we were able to BRRRR all of our money out of the deals.  

Besides, if I can borrow everything (25% from line of credit and 75% from portfolio lender) for the MF, that is essentially "no money down" and my return in infinite. 

I bet without the strong partnership 14 days might have been a tight timetable.I really respect your decision to partner. 50% of a deal is infinitely better than 100% of nothing, if you had never got started.

My sis would want the high side ($90k), and the possibility of having to spend $45k to buy her half of the interest in such rundown homes--who look to have a short shelf life--has me spooked. 

This concept deserves a much more in depth write up and can be looked up under names such as the 770 account, Income For life, Infinite Banking, etc (no I do not sell insurance, nor have I received or anticipate receiving any reimbursement for these statements).

This essentially gives you an infinite rate of return since you should be able to buy with no money into the deal now.

Since I had no money in the deal it was an infinite return.  

LLC's can't have shelf stock, so if a partner wants out, someone has to buy their shares (the LLC can't own shares of itself the way a corporation can since it only exists as a vehicle for the partners' interests).

Even worse, using off-the-shelf copy. 

Decent pay, infinite stability, good hours and VA loan advantage.