Brooklyn Mirage is the outdoor oasis in the Avant Gardner complex, situated in the heart of East Williamsburg. It's open during the summer season each year, and decked out with thousands of plants and even palm trees, and boasting a KV2 Audio system, it's designed to be a sensory experience for both the ears and eyes. It is the outdoor component of Avant Gardner, an 80,000-square-foot development at 140 Stewart Avenue in an industrial corridor of the East Williamsburg neighborhood, a few grubby blocks from Queens. By fall, a warehouse (now filled with sacks of cement mix and construction equipment) will be transformed into an event space. Another area will become a 5,000-square-foot club. All told, it will hold 6,000 visitors.