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BOSTON — Klaviyo, a tech firm that develops marketing software for e-commerce users, has signed a 160,000-square-foot office lease in Boston, according to The Boston Business Journal. The company will move from its 25,000-square-foot facility at 225 Franklin St. to the new location at 125 Summer St, an expansion that will create about 700 new jobs in the company’s primary engineering, sales and support teams. Oxford Properties Group is the landlord of both buildings at 225 Franklin St. and 125 Summer St.