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).Please keep in mind the multiple loan rules:Under those rules, the sum of the balances of a participant's outstanding 401k loans under a single 401k plan (using the highest outstanding balance of each loan over the last 12 months) can't exceed 50% or $50,000 whichever is less.

Happy to offer my opinion but you know your life best so keep seeking opportunities that you're over-looking.Unfortunately, hard money or private money looks like your best bet thus far.

Best bet would be to walk a couple contractors through and see what the estimates are.

When I worked in project management for a GC we were very detailed in any time delay that affects the finish date.

Remote professional relationships are very common.That said, your best bet locally is @Steven Hamilton II.

In the way I'm discussing commercial loans for a SFR it is synonymous, but I think some people refer to a master loan made for a portfolio of properties as Portfolio Lending, so there's bound to be multiple meanings floating around.I find loans to an LLC to be easier than to a person, but I bet that is because I have some incredible vendors that I have built trust with AND I am not a W-2 employee. 

I'd budget 12-15% combined with repairs.I bet you can get management for closer to 8% on a 16-unit property.Insurance looks very low for a property you expect to be worth $500k.What about water/sewer?

Yes, its slow but I can quit or drop dead anytime with no worries for my family or myself.

I bet you investors are finding them and flipping them, you just have to learn how to find them and get them).

Yeah did I ever change you bet.