Benefit of co-borrowing on a mortgage loan?

I have recently signed a contract together with my brother for a condo($450K) in NY and he is helping me on the down payment(20%) as well as portion of the monthly mortgage. He currently owns a property so this will not be his primary residence. He says he will benefit by being a co-borrower on the mortgage however, a few banks that I spoke mentioned that it might be best to get the loan myself... so, here's the question:





How will my brother benefit by being a co-borrower? If not, how exactly does he gets tax benefit?Benefit of co-borrowing on a mortgage loan?
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