Last week news broke that the Rizzoli Bookstore on 57th Street  is doomed. The owners of the well-loved building, which is not officially landmarked, plan to demolish it to to make way for another luxury residential tower. This set off another round of fretting about the future of bookstores, especially art and design bookstores.  But the news for bookstores might not be all bad. We hear that a new Urban Center may be brewing that would join together at least 11 New York civic organizations that have been adrift in hidden offices all over the city into a single “center” with an exhibition space and an architecture book store. Stay tuned.