The addition of BEZ 235 to Abiraterone Acetate provides an opportunity to test if inhibition of PI3K along with TORC1 will attenuate the survival mechanisms co-opted by CRPC when treated with Abiraterone Acetate. We will conduct a Phase I study to determine the MTD for this combination and use that dose for this Phase II study. Biopsies of metastatic disease prior to and during treatment with BEZ235 plus Abiraterone Acetate will allow for the determination if mutations in the PTEN and/or PI3kinase axis in biopsied tumors are associated with response to therapy with the combination of BEZ235 and Abiraterone Acetate.