The only Starbucks in Trenton is closing this month in a blow to the city’s economic progress, Mayor Reed Gusciora said Tuesday. The Starbucks, located at 102 S. Warren St., will close March 30, a barista at the store told NJ Advance Media. The site has been opened since 2017. “It’s devastating to Trenton’s economic revitalization,” Gusciora said. The mayor said the closure will bring an unfortunate new designation for New Jersey. “It will be the only capital city in the country without a Starbucks,” he said. The store is a downtown anchor, where members of the public meet and police officers …