Here's what I think I want to do since the house would likely make a good flip:Pay the 10% to clear the bank loan and ask for no repayment from the family in the short term. 

That is unique and creative. 

Fully built and stabilized, I estimate a monthly cash flow of $10,140 after accounting for all expenses, including the mortgage repayment on the bank loan.   

@Drew MylenbuschLower your student lon debt repayment so it helps your DTI regardless of what you pay and invest.

. $600K would be on the high side for a 5 unit around here, but this is a unique building. 

Her situation I feel is unique.

The repayment terms for a 401k participant loan are equal monthly/quarterly payments of principal and interest (typically prime plus 1%) over a 5-year term (longer if used to acquire your principal residence).Please note that if you take a full $50,000 and then pay back the loan, you can't take another $50,000 until 12 months after the first loan was fully paid back.Per the loan offset rules that went into effect with the 2018 Tax and Job Act: if you leave your job and the loan is current at the time you leave your job but then the loan goes into default because you left your job, you will have until your tax return deadline (including any timely filed extension) to make the loan current by depositing the outstanding balance into an IRA (and thereby avoid the taxes and penalties that would otherwise apply).Solo 401k vs.

I know every situation is unique, so just a little overview of mine:I already got my license in the past, so this is just to reinstate (in NJ). 

The problem with OHFA programs that you may run into is the fact that they require you to repay any assistance you received if you refinance or sell within 7 years of purchasing. 

I'm talking about buying at 75% ARV for cash and then, once it is rented, getting a 75% ARV loan to, as Alex advises, include an invoice for prepaid rehab costs and, there was something else but I can't recall it, it may have been closing costs, so that the loan will repay me all the cash I laid out to do the deal.