However, to maximize the benefit of the qualified business deduction (Section 199A deduction), an LLC might be the better choice even with the higher self-employment taxes. 

While also having more tax benefits than single family homes and requiring less money upfront than apartment complexes.

I believe on any type of government payments, the tenants are required to be respectful of the property or they risk losing their benefits... 

I have a primary residence at this time. I am planning to buy another house to move into the new house and then sell the existing house. So If I move to the new house and stay there for two years, would that be consid...

the state income tax does not benefit the CA investor they don't live there..

You just have to know how to work them to your maximum benefit.  

There are a lot of moving parts and you may benefit from speaking personally with another CPA to confirm.

I will also take the investment and occupier tax benefits as his low and fixed income won't need much tax breaks.Finding the right duplex that makes sense from both and ROI and location sense (not on "multifamily row" for example) will be challenging but I'm trying to see if this makes sense for me financially. 

They are much better suited in Austin, where real estate prices are so crazy that one can benefit from the cost savings of a tiny home. 

Benefits of 1031 exchange are you avoid paying taxes and if your in real state for the long term might as well keep your money in real estate, I see real estate as being a money printing machine.