The global heavyweight practice has drawn up three different proposals, one of which could see the 164-year-old station being razed to the ground.
Each of the schemes has been put out to public consultation, with two of the options illustrating how the current station could be retained.
However, should the option to demolish the station be pursued it would certainly be met with fierce opposition from heritage groups.
In 2003 a similar move to revamp the station, which sits in the west of the city, was thrown out because of resistance from heritage watchdog the Cockburn Association.
Two of Aedas' options show how the transport interchange could be entirely revamped with offices and shops, and an entirely new concourse for the station.
The third option would see a simple refurbishment of the station, without any new developments.
The consultation will continue until early June, and a further study of the preferred option will take place in September, with the study carrying on until the end of the year.
Work on the site is not expected to begin until 2014.