Chicago Mayor Rahm Emanuel has disclosed that his record property tax hike plan entails significant cuts for nearly 300,000 homeowners, leaving Chicago businesses predicting they will face hikes of up to 50 percent. The second-term mayor last week proposed a $544 million property tax increase, the city's biggest ever, to help fix one of the worst-funded city pension systems in America ... Emanuel's office, which has said one in four dollars of the tax hike would come from the city's central business district, did not contest the 50-percent figure. But a mayoral aide insisted Emanuel's plan is his best effort...