This study tests a new medication for treatment of kidney cancer, called BEZ235. This medication works by blocking several mechanisms that the cancer needs to grow and survive. By blocking these mechanisms, the medication can thus suppress further growth of the cancer, possibly kill cancer cells. Older kidney cancer medications (such as temsirolimus [Torisel®] or everolimus [Afinitor®]) typically only block one mechanism in cancer cells, so the investigators think that BEZ235 may work even better against kidney cancer.