For instance, I'm in the process of closing a refinance on a BRRRR right now.

These are off market homesFor instance one home I did a reverse white page search and found the previous owners name.

IE take for instance a blanket policy of no criminal history, ever.

For instance, I am sure everyone would love custom cabs - but will they pay you extra for them???

You could find for instance that the guaranty changed, was reduced to  a certain percentage, or removed all together.

For instance, if you invest in a house that is $100k, and your monthly rent income from it is $1000. 

In this particular instance, after a year of slashing prices, the seller has actually marked the property down to slightly less than what he paid a decade ago. 

For instance, if property tax is 1% and an apartment sells for $10MM, would the tax be $100K per year?

For instance if you plan to sell the business in 5-10 years a C Corp becomes more compelling.Typically a C or S election needs to be filed within 75 days after the start of the entity's tax year (which has passed if you formed the LLC in Feb 2018), but there is late relief available based on facts and circumstances if 'reasonable cause' can be substantiated. 

I establish the LLC in Texas and use Trusts to implement the layer of anonymity that the Wyoming LLC is so famous for.