St-Laurent still has a few "rapid" transit routes serving it, but nothing like the service it had with the Transitway. Other stations, such as Lees, adjacent to apartment towers with a high student population, Train (re-named Tremblay, serving VIA Rail) and Cyrville (nothing worth mentioning) have basically lost all rapid transit service.
The owner of the St-Laurent Shopping Centre, Morguard, is considering a
major re-development that could introduce an office tower, residential and a hotel. Any new development would retain the mall, though I imagine the old Sears might be replaced.
Morguard has done some significant work on two of its downtown properties, including re-vamping the old Delta Hotel complex across the street from Lyon Station to accommodate two Hilton Hotels and Heritage Place office tower, which includes direct subway access to Parliament Station. They had also built 150 Elgin a few years ago, which is the current world headquarter of Shopify. They've done some great work downtown and have faith they can turn St-Laurent around now that they seem to be shifting their focus.