Two restaurants opened this week on the Columbia Street Waterfront. Says our tipster: “Columbia Waterfront may yet be in the early stages of a food and drinking destination renaissance. Those in the know are scrambling to lock in leases on the street early in the wave, say some some observers close to the scene. As the success of Pok Pok has demonstrated thus far, people will find you if it’s that good!” Waters Edge Diner opened at 214 Columbia Street on Monday. The owner plans to serve breakfast, lunch and dinner. Maybe the best news is that the diner will open early, at 6 am. The second opening this week is Chio at 117 Columbia Street, in the former Casa di Campagna space. The New York Times wrote a brief on the restaurant, saying “The healthful Mediterranean notion that meat and fish should be mere condiments on plates of vegetables and grains will be put into practice by Alex McWilliams, the executive chef at this new Italian place in Brooklyn.” Anybody been to either place?