BISMARCK — Peacock Alley American Grill and Bar, a longtime Bismarck staple and one of the oldest restaurants in North Dakota, will close its downtown location in June. Owners Dale and Melodie Zimmerman said in a post on the restaurant's Facebook page that they were recently informed their lease would not be renewed and they would have to leave the restaurant’s space in the historic Patterson Place Building. The restaurant’s final day at the dow…