The Green Parking Council, a nonprofit that promotes sustainable building practices through its Green Garage rating system, has chosen an underground parking garage in Ann Arbor, Mich., as a "Demonstrator Site" -- a recognition given to "facilities that have committed to making an effort towards sustainability and who have made progress towards this end." Noteworthy green practices during construction of the garage include recycling of demolished concrete and other materials from the site, as well as the inclusion of excavated sand to form part of the structural concrete used to build the structure.

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