Investment Property: Duplex and monthly mortgage payments

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I have a client who we have recently preapproved and is looking to purchase a duplex for an investment and some cash flow to come in.

I did the rental surveys on a couple properties and compared it to the monthly payments but the loan payments are higher than both rental units for the duplex combined so there is no positive cash flow.

Were doing an interest only loan. What do i do or say so that my client gives an approval to go forward..He's looking for positive cash flow and the only thing i can think of is the tax deductions...

PLEASE HELP!! THANKS!!!!