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Crain's Chicago Business deputy managing editor Ann Dwyer takes a closer look at the top business stories of the week, including Motorola Solutions' announcement that it will move from the suburbs to downtown, and news of a developer eyeing the Old Chicago Main Post Office.

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In one of the biggest acquisitions in American history, Comcast has agreed to buy Time Warner Cable for $45 billion in stock. The deal would give Comcast approximately a third of the national cable market. So what would it mean for customers when the United States' number one cable operator buys the number two company? And will both the Federal Communications Commission and the Justice Department approve the massive deal?

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New York-based ad firm Omnicom and Paris-based ad firm Publicis merged on Sunday, creating the largest advertising firm with $23 billion in combined revenue. The merger might create complications since it will bring together rival clients, such as Coca-Cola and Pepsi, Procter & Gamble and Johnson & Johnson, and AT&T and Verizon. We have analysis.