The suspect pulled a gun on clerks on the Upper East and Upper West sides, police said.
The 20 bags of coffee were worth about $180, police said.
An outpost of the coffee and pastry chain has replaced a defunct photo shop.
The growth of chain stores in New York accelerated in 2012, according to a new report.
Signs and flags for a new Dunkin' Donuts on Lexington Avenue have sparked outrage on the Upper East Side.
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