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The $100 million addition to the George R. Vierno Center on Rikers Island is the first correctional facility in New York City to be constructed using precast concrete modular cells. A precast structure with modular precast cells and precast exterior facade was selected for its simplicity, small crew size, ability to withstand weather cycles during construction, and cost-effectiveness. Each module consists of two 72 square foot cells, fabricated off-site by Rotondo & Sons, Inc. of Avon, Conn. Each floor consists of two levels of cells: a main level that opens to a bi-level dayroom and the mezzanine level. The floors were constructed from precast planks with a 3-inch concrete topping.