Specifications include, but are not limited to:. The master plan should include the following set of development and design principles, which form the core strategies for increasing customer base at Penn Market and diversifying the vendors, merchandise mic and, as well as improving the physical spaces and supporting the evolving district around the Market, all to accomplish the Market’s mission: •Create modern, code compliant, energy efficient public market facilities that meet the needs of Market vendors and customers while maintaining the Market’s historical character •Keep a portion of the market open during construction •Utilize environmental design strategies inside and outside the Market to address security concerns while creating a place that welcomes the whole community •Continue to serve current customers while appealing to a wide array of York City residents, downtown workers, and visitors by offering a diverse range of quality products at affordable prices, particularly local authentic and unique fresh prepared products •Design facility to lower the effective costs of operations