The Monon restaurant, 814 N. Jackson St., a local landmark, unexpectedly closed down in the middle of the day Monday, Sept. 5. Gone are the decorations and train memorabilia on the walls as companies such as U.S. Foodservice removed their machines Wednesday after Vectren shut off the gas at the owner's request. On Thursday, the Indiana Department of Revenue placed an orange sign on the doors of the building prohibiting business from being done on the property as the restaurant has lost its registered retail merchant's certificate. According to the state website, this occurs when a business has not paid its back retail taxes. Bob Dittmer of the Department of Revenue said he was unable to comment on individual tax cases, and Monon owners Beverly and Jerry Monnett could not be reached after several attempts.