Take a look back through these pictures which show when it all started and the city centre landscape changed forever.
5. Piling up
Rubbish from the demolition of the Old Castle Market started to build up Photo: JPI Media
6. redevelopment plans
The whole Castle markets area has been the subject of redevelopment proposals since the 1980s, with part of the adjacent area being redeveloped with a hotel, multi-storey car park and several new office blocks in a development known as "The Square" by Carillion. Photo: JPI Media