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CAMBRIDGE, MASS. —Alexandria Real Estate Equities Inc. has broken ground on the first phase of a $500 million science and technology complex in Cambridge, Mass. Alexandria Center at Kendall Square will ultimately include 1.7 million square feet of office, laboratory and residential space. Biogen Idec, a global biotechnology firm, will occupy the first six-story, 307,000-square-foot building at 225 Binney St. when it delivers in 2013. The building is designed by architectural firm Spagnolo Gisness & Associates Inc.