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.

We are now working with the best legal consul.

selling notes do not have to get permission from the payor on the note to be legal nor do they have to notify but its common to notify so you know where to send your payment.

Is there a legal limit on how many rental units/tenants we could have on one single family lot?

Do not rely on it for legal advice.

I mean let's be real, about 80% of the complaints investors on BP have about their property manager, contractor, turnkey co, Realtor etc.... are just nonsense.

My real estate agent doesn’t seem familiar with that and didn’t tell me about the 3 people outside of family circle max requirement in single family zoning.I also need advice for renting finished basement legally and make more bedrooms, experiences and tips are more than welcome as he didn’t seem knowledgeable.Shall I change of real estate agent and find someone more used to this type of practice ?

What are some tax considerations or other legal issues to keep in mind as an out-of state investor investing in this market? 

Of course I keep entities separate in all legal and financial aspects. 

It's advisable for both spouses to communicate openly about such financial decisions and consider consulting with a legal or financial professional for tailored advice.