If you bought it right and have a solid purchase-to-rent ratio (1%, 2% rule) you should be just fine.  

@Dane FitchTo learn about the solo 401k loan rules, see the following IRS website. https://www.irs.gov/retirement-plans/retirement-plans-faqs-regarding-loansTo learn abut the prohibited transactions rules, visit the following IRS website.https://www.irs.gov/retirement-plans/retirement-plan-investments-faqs

The internet makes it pretty easy. 

I am interested in sfh 1300sf and bigger in A-B neighborhoods. 1% Rule minimum.

My fist was a 3 unit building, so a bit different, this one should be easy.

The first flips were during a super hot market, so 1 was an easy rehab and the other I purchased at a discount for cash simply resold 45 days later for profit.

Is there some rule of thumb regarding how much one should spend on a rehab? 

I'm just wondering what some people's rules of thumbs in the region are for like flipping or rents.Bigger Pocket guidelines are usually like 70% rule of thumb for flipping and 2% test for BRRR.The Bay is kind of a special child, so was wondering what kind of numbers people look for here?

The more you have the more you can lend...the old "it takes money to make money rule" BUT...if you borrow OPM and lend it out then you can use theirs to make the spread.

If you accidentally take out too much, no rule says you can't pay a mortgage balance down during a refinance.