The St. Louis Regional Convention and Sports Complex Authority voted 9-0 Wednesday to use the power of eminent domain if necessary to assemble land for a new stadium. The authority oversaw construction of the domed stadium downtown two decades ago and is doing the same in early planning for a new open-air stadium. The 88-acre site north of downtown consists of 103 parcels. A representative said they would seek condemnation only if a landowner refused to negotiate or to clarify land-title issues, such as liens on property.