^ It reduced the area required for surface parking. It's too bad that the towers on Robert Speck Parkway weren't built with all-underground parking, but that's unfortunately the economics of office towers in Mississauga. If you were to require underground parking in the City Centre (construction cost in the range of $15,000 per space), the office towers might not get built at all. They would be built instead in the Heartland area, or Meadowvale, with all-surface parking sprawling all over the place.
Edit: I hope Martinsizon can provide some more pics. He seems to have a good vantage point from which to take them.