Bally’s Chicago is scrambling to find a new spot for its planned hotel tower at the Freedom Center casino site to avoid damaging city water pipes near the Chicago River. The tower needs to be relocated from the north end of the site, and could be shorter, depending on the revised design, Bally’s Chairman Soo Kim said Wednesday. “We need to come up with a different way to build a tower because we can’t now put it on Chicago Avenue,” Kim said. The change in plans arose recently when Bally’s began a detailed exploration of the foundation it would need to erect a 500-room hotel tower along the riv…