Emanuel aides say not all of this year's property tax hike is a result of the city's $318 million increase to make higher contributions to pension funds for police officers and firefighters. But the bulk of the increase is, and the other big piece results from property tax increases at Chicago Public Schools. The schools also are controlled by Emanuel, who repeatedly used the phrase "hold harmless," when referring to his original plan to protect owners of homes worth $250,000 or less.