Best legal structure for my investment properties?

[Ryan Ryu]

Hello, all

My name is Ryan in Montgomery Alabama. 

I own 5 houses (1 with Mortgage, 4 paid off)

I am living in one house with mortgage on it. 

and 4 houses are rented for maybe around $650 net income(after property tax, HOA and etc)

Until last year, I paid lots of tax for rental income. 

Now i am thinking of creating separate entity. 

and transfer all properties to the entities. 

so I can reduce the rental income tax asap.

What would be the best legal structure that i can go with? 

I am a very active investor and my goal is to have more than 10 houses within 5 years. 

Thanks for you guys' advice !