Or how this affects me after the sale.  

The seller should have informed you about the POS violations as soon as they were aware of them.Realtor's ResponsibilitiesYour realtor has a fiduciary duty to act in your best interest, which includes conducting due diligence to uncover any issues that could affect the transaction.

I’d love to hear your experiences on where and how to effectively conduct these searches.What tools or resources have you found most reliable for uncovering any liens, encumbrances, or issues that could affect the property title?

So that means if my downpayment is $80,000, $30,000 is really going to affect things:1) Capital raised.

The 4th tenant was out of town and not affected.

If Dani is following this thread still, do be aware of assembly bill 968 and how it affects do it yourself flips. 

DO NOT, I repeat, DO NOT use any debit or credit cards you rely on. 

We will focus on rehabbing and BRRRR’ing (Buy Rehab Rent Refinance Repeat) SFR/MFR properties.

I have a friend who works for a well-renowned construction company in our town who has offered to be our general contractor at a discount (only charging us 8% vs. the standard 15%) and "teach me the ropes"/make the right introductions so that I can repeat this on my own in the future. 

It is not taxes, does not report to credit, does not affect your debt to income!