Harry’s Pizzeria and Tavern in West Hartford, a downtown thin-crust institution for decades, will close its doors March 14. Harry’s owners, Bob and MaryAnn Hagmeier, say negotiations broke down last week over a new lease for the 39 South Main St. eatery. “We had started conversations with the landlord before the end of the year,” MaryAnn Hagmeier said. “It was very expensive at the best of .