Vineyard Gate will be a contemporary retail scheme comprising a wide range of new units including a department store, a bus station, parking facilities and residential accommodation.
The shortlist for the department store's facade includes Chapman Taylor, Studio Egret West, Hawkins\Brown and Hakes Associates.
The shortlist for the bridge sees Birds Portchmouth Russum take on MLM Consulting Engineers with Hakes Associates and Price & Myers.
The final shortlist for the public realm involves awp, Chris Blandford Associates and Gross Max.
The proposals will be presented at a public exhibition in Colchester early next month.