Starbucks is laying off 51 employees in Washington, including 43 coffeehouse workers at five stores set to close and eight employees at its Seattle headquarters, according to a state filing received Wednesday by the Employment Security Department. The headquarters layoffs are scheduled to take place from Nov. 14 through Dec. 4. Most of the retail positions affected are held by baristas. The five closing locations are in Seattle, Redmond, Spokane and Vancouver. The company has said it reviewed its North American coffeehouse network and identified stores where it could not consistently provide the customer and employee experience it wants, or where it saw no route to acceptable financial performance. In a Sept. 24 letter, Chief Operating Officer Mike Grams said Starbucks planned to close about 250 coffeehouses across North America. Two Washington locations affected by the closures — one in Spokane and one in Redmond — have unionized workers represented by Starbucks Workers United. The union said it had negotiated an agreement covering how workers at those stores would be treated, including transfers or severance pay. The Washington reductions add to a series of Starbucks store closures and layoffs over the past year. The company’s “Back to Starbucks” plan, led by CEO Brian Niccol, aims to restore a more traditional coffeehouse experience through store upgrades, increased staffing and operational changes. Starbucks reported $9.3 billion in revenue for the quarter that ended June 28, down 1% from the same quarter a year earlier. Its North American store count fell to 18,371 at the end of the quarter, compared with 18,734 a year earlier.