In fact, a common colleague of Chris and mine worked with them for a few years but departed once he learned of the issues outlined above.   

An agent has a fiduciary duty to protect your best interests, which include protection from the many different liabilities that can pop up during the course of a transaction.

In Metro Detroit area, police will not remove these types of occupants (they are afraid of scamming landlord having police remove legal tenants), calling them a "civil matter" forcing landlord to start court eviction process.Here is some of the guidelines local police departments have put out regarding enforcement. • The requesting person is the property owner or authorized agent of the property owner. • The real property that is being occupied includes a residential dwelling.• An unauthorized person or persons have unlawfully entered and remain or continue to reside on the property owner's property.• The real property was not open to members of the public at the time the unauthorized person or persons entered. • The property owner has directed the unauthorized person to leave the property. • The unauthorized person or persons are not current or former tenants pursuant to a written or oral rental agreement authorized by the property owner. • The unauthorized person or persons are not immediate family members of the property owner. • There is no pending litigation related to the real property between the property owner and any known unauthorized person. 

Or what would a title company be able to provide outside of transactions?

You really want to have your contract approved by an attorney even though California doesn't use attorneys for transactions.

It has been mentioned above but your best bet is to separate the SFR and the 8 unit into two separate transactions.

It now makes me question whether other platforms, like Avail, are also allowing the tenant to pay via credit card and we as landlords are just unaware of the mechanism because it's a side of the transaction we don't have visibility into.

Additionally, you could not move your Roth IRA funds into a Solo(k) because for some reason unknown to even the Department of Treasury (I asked them) Roth IRAs cannot transfer into the Roth bucket of a Solo 401(k).

If you've transacted in hundreds of transactions over the last two years and have 15 employees how are you funding the current operation? 

Transacting real estate is expensive.