How to blend an old building with a new part?

An historic shopping centre with a regional profile, Shopville Gran Reno is located in Casalecchio di Reno alongside a highway that abuts Bologna, and offers a direct link to the Bologna train station. From its easily accessible site near Unipol Arena, the mall serves an ideal catchment area. A large scale renovation of the shopping centre is currently under way, designed to double the mall in size.