 Renew Baltimore, a group made up of realtors and others, collected more than 23,000 signatures, more than double what was required to get the charter amendment on the ballot. The measure would cut the city's property tax rate in half over a seven-year period. In a letter Tuesday to the group's attorney, city elections director Armistead Jones said the charter amendment is illegal since only the city council can legally set the property tax rate. Renew Baltimore officials say they're going to court to try to overturn Jones' decision.