Bidders Brookfield Multiplex, Bowmer & Kirkland, Galliford Try and McLaren Construction are now waiting for an announcement in time for work to start in September.
Traders have begun moving out ahead of the the two-year revamp which will see a new roof, larger public areas and improvements to the surrounding infrastructure.
Anchor tenant Harvey Nichols will double the size of its current store under the plans from site owners Brockton Capital and partner Milligan Retail.