Raj Aggarwal is leaving Kendall Square. After three years spent building his tech start-up in the Cambridge neighborhood, he’s giving up an address that has become synonymous with the region’s innovative economy. “This has still got to be the single biggest concentration for technology companies,” said Aggarwal recently at Voltage Coffee & Art, a popular Kendall Square gathering spot for software engineers and venture capitalists. “But that’s going to change.” Aggarwal’s departure comes at a moment of transition for the neighborhood.
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