Financing a 6 duplex deal

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I have found 6 duplexes that I want to buy. They are all owned free and clear except 1. They are all next door to each other on the same street, but they are on different lots. They have different tax bills. The owner wants to sell all in 1 deal. He will not separate them. 

Is it possible to get 1 loan for all 6? 

If I got 1 loan for all 6, would it be a residential loan or commercial loan? I know that a duplex falls into the residential category, but I dont know if I would need a commercial loan since I want 6 of them financed together.