The combined station and hotel building will form a central part of the £1bn regeneration of the waterfront.
Sleeperz Hotels, the UK budget hotel company, has signed up for the scheme, which already has planning.
The work programme includes retaining the original Victorian platform which will be fronted by a curving six storeys building containing a triple height arch as a nod to grand Victorian station design.
The £20m building project is timetabled to start construction next April and be completed two years later.
Firms have until 13 August to complete the PQQ, which can be obtained from the Public Contracts Scotland website.