Would the addition of the Mezz debt increase, decrease, or have no impact on your equity project returns (IRR)?

You are analyzing a potential purchase of a retail center with modest vacancy and preliminarily have the following capital structure with the indicated debt rate and expected equity project return (IRR):

Now you are told that an investor is willing to provide you with mezzanine debt with a coupon of 12%. The existing amount of senior debt and its rate remain unchanged. Would the addition of the Mezz debt increase, decrease or have no impact on your equity project returns (IRR)? Or is there insufficient information to answer the question?

A. Increase B. Decrease C. No change D. Insufficient Info