Duluth's City Council decides tonight whether to either increase the tax on city's restaurants or hotels, to help pay for a planned expansion of Duluth's Convention Center. The City's 12-and-a-half percent tax on some hotel rooms ties Bloomington and Saint Paul for highest in Minnesota. A new tax increase also faces an uncertain future in the Minnesota Legislature, which has to approve the increase. Minnesota Public Radio's Bob Kelleher reports... City officials have asked the Legislature for 28-million dollars to expand the Duluth Entertainment Convention Center, known as the DECC. The center has been a big success, making it the nation's 11th busiest in number of events, but it has had to turn away conventions because it can't handle two events at once or the largest single conventions. Minnesota's House and Senate