To be honest, I would have much rather GO/GTTA have built at one of their busy commuter rail stations instead of downtown Toronto. I know that from a business side of things it is better to be located in the core. However, from the mandate of place to grow and intensifying transit-hubs/corridors, wouldn't rebuilding-intensifying a place like Oakville GO staiton be a worthy candidate for this office building? The station area has a lot of redevelopment possibility but just needs to do something about its expansive parking situation. By building on this area, GO could accomplish three objectives at once:
1) Decrease surface parking lot space by building a structure that includes commuter parking;
2) contribute/lead to the intensification of a 'place to grow' under the growth plan;
3) Obtain the office/operational space the organization needs.
They could also sell off their Toronto land.
Either way, 18 stories is fine enough. I just hope the architecture humbles the area.