There are dark clouds on the horizon for cities, which for decades have used eminent domain or its threat as a tool to replace run-down neighborhoods with tax-generating, job-creating businesses. Not only are courts across the nation beginning to side with private-property rights' advocates, the Utah Legislature is cracking open the door to have a look. This is at the behest of educators and Gov. Olene Walker, who note the loss of revenue to schools from some redevelopment projects. Cities also are paying attention to Kelo v. City of New London, a case scheduled for arguments before the U.S. Supreme...