This July 16, 2013, aerial file photo, shows downtown Detroit. In its pitch to convince Amazon to locate its second headquarters downtown, Detroit has offered something once considered an embarrassment: vacant space. The proposal to the Seattle-based online retail giant includes office space in existing buildings, more square footage in projects under development and nearly 100 acres to build on. It also features a promise from utilities to offer wind power and systems to maximize energy efficiency, and partnerships with universities. (AP Photo/Paul Sancya, File)
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