STM explains high cost of blue line

The STM is trying to explain why the blue line extension has a projected cost four times that of the Laval extension and the main cost is the many property expropriations needed this time, compared to crossing the Back River. The blue line cost also includes a pedestrian tunnel to the proposed fast bus route on Pie-IX, train garage underground, bus termini and parking lots, but I imagine the Laval extension included similar features.