The proper answer is "it depends" I don't know anything about your case.I do prefer simple over unnecessary complexity.

Get your basic estate docs in place before building a complex entity structure.  

Perhaps I have an odd case but I paid $1.35M or $455 / sq ft for a 3,000 sq ft duplex on a 7,000 sq ft lot in Los Feliz.Once I add the ADU complex, which will be around $350K, it will be a quadplex, 4,600 sq ft of living space. 

This not only helps me spread my money wisely but also eliminates the need for me to handle the day-to-day management tasks or hire someone to do so.Currently, I am investing in a mobile home park, several apartment complexes across the United States, and even a manufacturing plant.

I manage a few smaller complexes and they are all on individual price schemes though they are usually within a few dollars of each other. 

On literally every corner there's a new construction project for huge apartment complexes and there's tons of inventory.

What adds complexity to our plan, is that we live in Minnesota.

This is a sweet cash flow deal that could generate a lot of profit for you, particularly after you move out.

But if you have a $10M apartment complex going sideways, don't even waste your W2 money.

The capital stack especially in CA is VERY complex and typically involves everything and more that you mentioned.