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Downtown’s Martin Luther King, Jr. Library will be redesigned by the architectural firms Mecanoo and Martinez+Johnson Architecture, Mayor Vince Gray announced this morning—-a project that will install a diagonal addition and public gardens atop the controversial (or, depending on your aesthetic leanings, iconic) Mies van der Rohe-designed building. Aaron Wiener, returning from vacation, will have a take on the announcement later today. For now, here’s the winning proposal:

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