Prices for industrial properties in the greater San Fernando Valley area continued to skyrocket in the third quarter, according to a report released by Colliers International. Sale prices were up 29 percent to an average of $135 per square foot, versus the year ago period, the report found. The West San Fernando Valley garnered the highest selling prices in the period, an average $143 per square foot, followed by Santa Clarita Valley were prices averaged $138 per square foot.